From 6c4457eada463b98e8a7b192a61c2d1c96ad5091 Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 12:14:08 +0000 Subject: [PATCH 01/10] #251: leave nothing of a materialized closure inside the snapshot arena MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A task writing $GLOBALS['x'] stored the literal from its own op_array as the key. That literal lives in the snapshot arena, and thread_copy_string marks every string there interned, so the symbol table kept the pointer without a reference. The arena is freed when the task ends; while the memory stayed untouched the key still read as interned and release was a no-op, which is why one such task was harmless. The next task reused the block, the string header was overwritten, and shutdown handed the allocator a pointer it never issued. op_array_to_emalloc already moves opcodes, literals and the rest into the current thread's heap; it ran only for closures with nested definitions, a condition introduced for the run_time_cache race in #176. It is now unconditional, and the second call in closure_transfer_obj is gone with it — a closure passed by value was copied twice, the second copy overwriting the first without freeing it, which leaked in ten tests when the first call became unconditional. Measured on 2000 trivial submits over two workers, five runs each: 20 ms before, 20 ms after, spread 16-21. The extra copy per task does not show. --- CHANGELOG.md | 1 + tests/thread_pool/084-task_writes_global.phpt | 46 ++++++++++++++++++ .../085-task_stores_closure_in_global.phpt | 47 +++++++++++++++++++ thread.c | 21 ++++----- 4 files changed, 103 insertions(+), 12 deletions(-) create mode 100644 tests/thread_pool/084-task_writes_global.phpt create mode 100644 tests/thread_pool/085-task_stores_closure_in_global.phpt diff --git a/CHANGELOG.md b/CHANGELOG.md index 9c5787c..269243c 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0 ### Fixed +- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. - **The GC threshold grew by 10000 after every full root buffer in async mode and never came back down**, so collections ran further and further apart and the memory amplitude grew with them until a long-running server reached `memory_limit` (#234). A collection in async mode is handed to the GC coroutine and reports 0 collected nodes to the caller that triggered it, so the threshold is now adjusted inside that coroutine, from the count it actually collected. - **A value set on `root_context()` was invisible to `current_context()->find()` in an HTTP handler.** The walk up the Scope chain ended at the first Scope holding no Context of its own, and a Scope receives a Context only when someone asks for one. A handler runs under a per-request Scope below the server's Scope, and neither of those two had ever touched its Context, so the walk stopped two links short of the main Scope while `root_context()` kept answering, because it reads the main Scope's Context directly (#237). Scopes without a Context are now skipped instead of ending the walk. Reproduced with main scope -> `Scope::inherit()` -> `Scope::inherit()` -> coroutine: `null` before the fix, the stored value after. - **The Context stubs described a store that does not exist.** `Context` was documented as immutable with `set()` and `unset()` returning new instances, `has()` as reading the local Context alone, `get()` as reading it alone as well, and `current_context()` as the coroutine's own Context. `set()` and `unset()` change the Context in place and return it, `get()` and `has()` read the Scopes above too, and the coroutine's own Context comes from `coroutine_context()`. `Scope::__construct()` now carries a contract of its own: a `new Scope()` has no parent, so lookup from inside it never reaches the main Scope, `request_context()` is null there, and disposal cancels running coroutines until `allowZombies()` is called. diff --git a/tests/thread_pool/084-task_writes_global.phpt b/tests/thread_pool/084-task_writes_global.phpt new file mode 100644 index 0000000..a941c60 --- /dev/null +++ b/tests/thread_pool/084-task_writes_global.phpt @@ -0,0 +1,46 @@ +--TEST-- +ThreadPool: a task writing into $GLOBALS leaves nothing pointing into its snapshot +--SKIPIF-- + +--FILE-- +submit(static function() { + $GLOBALS['x'] = 1; + $GLOBALS['y'] = 2; + $GLOBALS['z'] = 3; + return 'written'; + })); + + $seen = await($pool->submit(static function() { + return ($GLOBALS['x'] ?? 'gone') . ($GLOBALS['y'] ?? 'gone') . ($GLOBALS['z'] ?? 'gone'); + })); + + var_dump($seen); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +string(3) "123" +Done diff --git a/tests/thread_pool/085-task_stores_closure_in_global.phpt b/tests/thread_pool/085-task_stores_closure_in_global.phpt new file mode 100644 index 0000000..9551876 --- /dev/null +++ b/tests/thread_pool/085-task_stores_closure_in_global.phpt @@ -0,0 +1,47 @@ +--TEST-- +ThreadPool: a closure a task left in $GLOBALS is callable from the next task +--SKIPIF-- + +--FILE-- +submit(static function() { + $GLOBALS['later'] = static fn(int $n): int => $n * 3; + return 'stored'; + })); + + // Allocation pressure in between, so the freed arena block is handed out + // again: without that the stale body often still reads as itself. + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 20000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + $result = await($pool->submit(static function() { + $fn = $GLOBALS['later'] ?? null; + return $fn === null ? 'gone' : $fn(14); + })); + + var_dump($result); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +int(42) +Done diff --git a/thread.c b/thread.c index c320987..db26e88 100644 --- a/thread.c +++ b/thread.c @@ -2555,12 +2555,16 @@ void async_thread_create_closure_ex( zend_array_destroy(loaded_vars); } - /* Self-contain the op_array per worker when it has nested defs, else they - * stay shared with the snapshot and race on run_time_cache (#176). */ + /* Self-contain the op_array in this thread's heap, always. Two reasons, and + * the second is why there is no condition: nested defs shared with the + * snapshot race on run_time_cache (#176), and anything left pointing into + * the snapshot arena outlives it — the arena is freed when the task ends, + * while what the body stored elsewhere is not. `$GLOBALS['x'] = 1` is + * enough: the key is this op_array's literal, marked interned so the symbol + * table keeps it without a reference, and shutdown then releases a string + * the allocator never handed out (#251). */ async_zend_closure_t *closure = (async_zend_closure_t *) Z_OBJ_P(closure_zv); - if (closure->func.op_array.num_dynamic_func_defs != 0) { - op_array_to_emalloc(&closure->func.op_array); - } + op_array_to_emalloc(&closure->func.op_array); } /* Top-level: no load in progress, so the closure gets its own ctx. */ @@ -3364,13 +3368,6 @@ static zend_object *closure_transfer_obj( return fallback; } - /* Detach the top-level from the snapshot arena. Nested-def closures - * were already fully copied by async_thread_create_closure (#176). */ - async_zend_closure_t *closure = (async_zend_closure_t *) Z_OBJ(closure_zv); - if (closure->func.op_array.num_dynamic_func_defs == 0) { - op_array_to_emalloc(&closure->func.op_array); - } - /* Not freed here: with a cycle the snapshot's captured vars include an * object still being loaded above us. The shell's release walk frees it * afterwards, and its visited set makes that happen exactly once. */ From 7ad397aef09fc44eb144e5b522c725e94786571a Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 12:34:25 +0000 Subject: [PATCH 02/10] #251: localize literal arrays and attributes too MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Moving the op_array into the thread's heap left two things behind in the snapshot arena. zend_array_dup copies the buckets of a literal array and stops there, so its keys and string values stayed arena-interned. A task storing ['a' => 'b'] into a global and reading it back after the block was handed out again asked the allocator for 375714811215953 bytes. The attribute table was copied into the arena and marked immutable with no destructor, so zend_hash_release left it alone and it died with the task. Reflection on a closure that outlived its task then read a freed header and hit the assertion in read_attributes. Both are rebuilt in the thread's heap now. An attribute argument given as a constant expression stays an AST in the arena and is not localized — named in the comment, not silently skipped. Two tests, each red on revert. --- CHANGELOG.md | 2 +- .../086-task_global_literal_array.phpt | 47 ++++++++ .../087-task_global_closure_attributes.phpt | 60 ++++++++++ thread.c | 104 +++++++++++++++++- 4 files changed, 211 insertions(+), 2 deletions(-) create mode 100644 tests/thread_pool/086-task_global_literal_array.phpt create mode 100644 tests/thread_pool/087-task_global_closure_attributes.phpt diff --git a/CHANGELOG.md b/CHANGELOG.md index 269243c..908f17f 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0 ### Fixed -- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. +- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. Two more of the same shape went with it: a literal array kept its keys and string values in the arena, so reading one back gave a garbage length, and the attribute table was left there whole, so reflection on a surviving closure read a freed header. - **The GC threshold grew by 10000 after every full root buffer in async mode and never came back down**, so collections ran further and further apart and the memory amplitude grew with them until a long-running server reached `memory_limit` (#234). A collection in async mode is handed to the GC coroutine and reports 0 collected nodes to the caller that triggered it, so the threshold is now adjusted inside that coroutine, from the count it actually collected. - **A value set on `root_context()` was invisible to `current_context()->find()` in an HTTP handler.** The walk up the Scope chain ended at the first Scope holding no Context of its own, and a Scope receives a Context only when someone asks for one. A handler runs under a per-request Scope below the server's Scope, and neither of those two had ever touched its Context, so the walk stopped two links short of the main Scope while `root_context()` kept answering, because it reads the main Scope's Context directly (#237). Scopes without a Context are now skipped instead of ending the walk. Reproduced with main scope -> `Scope::inherit()` -> `Scope::inherit()` -> coroutine: `null` before the fix, the stored value after. - **The Context stubs described a store that does not exist.** `Context` was documented as immutable with `set()` and `unset()` returning new instances, `has()` as reading the local Context alone, `get()` as reading it alone as well, and `current_context()` as the coroutine's own Context. `set()` and `unset()` change the Context in place and return it, `get()` and `has()` read the Scopes above too, and the coroutine's own Context comes from `coroutine_context()`. `Scope::__construct()` now carries a contract of its own: a `new Scope()` has no parent, so lookup from inside it never reaches the main Scope, `request_context()` is null there, and disposal cancels running coroutines until `allowZombies()` is called. diff --git a/tests/thread_pool/086-task_global_literal_array.phpt b/tests/thread_pool/086-task_global_literal_array.phpt new file mode 100644 index 0000000..02fda81 --- /dev/null +++ b/tests/thread_pool/086-task_global_literal_array.phpt @@ -0,0 +1,47 @@ +--TEST-- +ThreadPool: a literal array a task stored in $GLOBALS keeps its own strings +--SKIPIF-- + +--FILE-- +submit(static function() { + $GLOBALS['arr'] = ['alpha' => 'beta', 'gamma' => 'delta']; + return 'stored'; + })); + + // Allocation pressure, so the freed arena block is handed out again. + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + $seen = await($pool->submit(static function() { + $arr = $GLOBALS['arr'] ?? []; + return implode(',', array_keys($arr)) . '|' . implode(',', $arr); + })); + + var_dump($seen); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +string(22) "alpha,gamma|beta,delta" +Done diff --git a/tests/thread_pool/087-task_global_closure_attributes.phpt b/tests/thread_pool/087-task_global_closure_attributes.phpt new file mode 100644 index 0000000..d83d378 --- /dev/null +++ b/tests/thread_pool/087-task_global_closure_attributes.phpt @@ -0,0 +1,60 @@ +--TEST-- +ThreadPool: attributes of a closure a task stored in $GLOBALS stay readable +--SKIPIF-- + +--FILE-- +submit(static function() { + $GLOBALS['tagged'] = #[Marker('tagged-closure')] static function() { return 1; }; + return 'stored'; + })); + + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + $seen = await($pool->submit(static function() { + $fn = $GLOBALS['tagged'] ?? null; + + if ($fn === null) { + return 'gone'; + } + + $attributes = (new ReflectionFunction($fn))->getAttributes(); + + return $attributes === [] + ? 'no attributes' + : $attributes[0]->getName() . ':' . ($attributes[0]->getArguments()[0] ?? '?'); + })); + + var_dump($seen); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +string(21) "Marker:tagged-closure" +Done diff --git a/thread.c b/thread.c index db26e88..e748466 100644 --- a/thread.c +++ b/thread.c @@ -2171,6 +2171,103 @@ static void op_array_emalloc_copy_type(zend_type *type) * After this call, the op_array is fully self-contained in emalloc * and the persistent source (snapshot arena) can be freed. */ +/* Rebuild a literal array with strings this thread owns. zend_array_dup copies + * the buckets and stops there: keys and string values keep pointing into the + * snapshot arena, and an interned string is never refcounted, so nothing keeps + * them alive once that arena is gone. */ +static HashTable *op_array_emalloc_copy_array(const HashTable *src) +{ + HashTable *dst = zend_new_array(zend_hash_num_elements(src)); + + zend_string *key; + zend_ulong idx; + zval *val; + + ZEND_HASH_FOREACH_KEY_VAL((HashTable *) src, idx, key, val) { + zval copy; + + switch (Z_TYPE_P(val)) { + case IS_STRING: { + zend_string *value = zend_string_init(Z_STRVAL_P(val), Z_STRLEN_P(val), 0); + zend_string_hash_val(value); + ZVAL_NEW_STR(©, value); + break; + } + case IS_ARRAY: + ZVAL_ARR(©, op_array_emalloc_copy_array(Z_ARR_P(val))); + break; + default: + ZVAL_COPY(©, val); + break; + } + + if (key != NULL) { + zend_string *local = zend_string_init(ZSTR_VAL(key), ZSTR_LEN(key), 0); + zend_string_hash_val(local); + zend_hash_add_new(dst, local, ©); + zend_string_release(local); + } else { + zend_hash_index_add_new(dst, idx, ©); + } + } ZEND_HASH_FOREACH_END(); + + return dst; +} + +/* Localize a literal value: a string or an array from the snapshot arena is + * rebuilt in this thread's heap, everything else is copied as it is. */ +static void op_array_emalloc_copy_value(zval *dst, const zval *src) +{ + switch (Z_TYPE_P(src)) { + case IS_STRING: { + zend_string *value = zend_string_init(Z_STRVAL_P(src), Z_STRLEN_P(src), 0); + zend_string_hash_val(value); + ZVAL_NEW_STR(dst, value); + break; + } + case IS_ARRAY: + ZVAL_ARR(dst, op_array_emalloc_copy_array(Z_ARR_P(src))); + break; + default: + ZVAL_COPY(dst, src); + break; + } +} + +/* Rebuild the attribute table in this thread's heap. The snapshot's table is + * marked immutable with no destructor, so zend_hash_release leaves it alone and + * it dies with the arena — after which reflection reads a freed header. The + * rebuilt one is owned by this op_array and freed with it. + * + * An argument given as a constant expression stays an AST pointing into the + * arena; that one is not localized here. */ +static HashTable *op_array_emalloc_copy_attributes(const HashTable *src) +{ + HashTable *dst = NULL; + zval *v; + + ZEND_HASH_PACKED_FOREACH_VAL((HashTable *) src, v) { + const zend_attribute *attr = Z_PTR_P(v); + zend_string *name = zend_string_init(ZSTR_VAL(attr->name), ZSTR_LEN(attr->name), 0); + + zend_attribute *copy = zend_add_attribute(&dst, name, attr->argc, + attr->flags & ~ZEND_ATTRIBUTE_PERSISTENT, attr->offset, attr->lineno); + + zend_string_release(name); + + for (uint32_t i = 0; i < attr->argc; i++) { + if (attr->args[i].name != NULL) { + copy->args[i].name = zend_string_init( + ZSTR_VAL(attr->args[i].name), ZSTR_LEN(attr->args[i].name), 0); + } + + op_array_emalloc_copy_value(©->args[i].value, &attr->args[i].value); + } + } ZEND_HASH_FOREACH_END(); + + return dst; +} + static void op_array_to_emalloc(zend_op_array *op_array) { /* refcount — own copy */ @@ -2252,7 +2349,7 @@ static void op_array_to_emalloc(zend_op_array *op_array) break; } case IS_ARRAY: - ZVAL_ARR(dst, zend_array_dup(Z_ARR_P(src))); + ZVAL_ARR(dst, op_array_emalloc_copy_array(Z_ARR_P(src))); break; default: /* Scalars (long/double/bool/null) and IS_CONSTANT_AST: @@ -2369,6 +2466,11 @@ static void op_array_to_emalloc(zend_op_array *op_array) op_array->vars = new_vars; } + /* attributes */ + if (op_array->attributes) { + op_array->attributes = op_array_emalloc_copy_attributes(op_array->attributes); + } + /* live_range */ if (op_array->live_range) { zend_live_range *new_lr = safe_emalloc(op_array->last_live_range, sizeof(zend_live_range), 0); From 128c4d2384a5a2745f0df4e373bd8dc1b88e0e2b Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 12:44:01 +0000 Subject: [PATCH 03/10] #251: localize the tree of a constant-expression attribute argument The last thing a materialized closure still shared with the snapshot arena. Such an argument is kept unevaluated until something asks for it, and the tree it is kept as was copied into the arena like everything else; zend_ast_copy rebuilds it in this thread's heap. The test that goes with it does not go red on revert, and says so: the freed tree still read as itself and valgrind reported nothing. It records the contract rather than catching the defect. --- .../088-task_global_attribute_const_expr.phpt | 64 +++++++++++++++++++ thread.c | 10 ++- 2 files changed, 72 insertions(+), 2 deletions(-) create mode 100644 tests/thread_pool/088-task_global_attribute_const_expr.phpt diff --git a/tests/thread_pool/088-task_global_attribute_const_expr.phpt b/tests/thread_pool/088-task_global_attribute_const_expr.phpt new file mode 100644 index 0000000..754fedf --- /dev/null +++ b/tests/thread_pool/088-task_global_attribute_const_expr.phpt @@ -0,0 +1,64 @@ +--TEST-- +ThreadPool: an attribute argument written as a constant expression survives its task +--SKIPIF-- + +--FILE-- +submit(static function() { + $GLOBALS['tagged'] = #[Marker(Marker::LABEL . '-suffix')] static function() { return 1; }; + return 'stored'; + })); + + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + $seen = await($pool->submit(static function() { + $fn = $GLOBALS['tagged'] ?? null; + + if ($fn === null) { + return 'gone'; + } + + $attributes = (new ReflectionFunction($fn))->getAttributes(); + + return $attributes === [] + ? 'no attributes' + : $attributes[0]->getName() . ':' . ($attributes[0]->getArguments()[0] ?? '?'); + })); + + var_dump($seen); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +string(30) "Marker:const-expr-label-suffix" +Done diff --git a/thread.c b/thread.c index e748466..d9b7919 100644 --- a/thread.c +++ b/thread.c @@ -2228,6 +2228,12 @@ static void op_array_emalloc_copy_value(zval *dst, const zval *src) case IS_ARRAY: ZVAL_ARR(dst, op_array_emalloc_copy_array(Z_ARR_P(src))); break; + case IS_CONSTANT_AST: + /* An argument written as a constant expression stays unevaluated + * until something asks for it, and the tree it is kept as lives in + * the arena like everything else. */ + ZVAL_AST(dst, zend_ast_copy(Z_ASTVAL_P(src))); + break; default: ZVAL_COPY(dst, src); break; @@ -2239,8 +2245,8 @@ static void op_array_emalloc_copy_value(zval *dst, const zval *src) * it dies with the arena — after which reflection reads a freed header. The * rebuilt one is owned by this op_array and freed with it. * - * An argument given as a constant expression stays an AST pointing into the - * arena; that one is not localized here. */ + * Arguments are localized by op_array_emalloc_copy_value, including the tree of + * one written as a constant expression. */ static HashTable *op_array_emalloc_copy_attributes(const HashTable *src) { HashTable *dst = NULL; From 6df43dedd1d693e12d4be328fb4ad633a94bea16 Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 12:59:15 +0000 Subject: [PATCH 04/10] #251: one localizer for every literal, and the parameter doc comment with it MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A review round found four more pointers into the arena, and one of them was made lethal by the earlier commit. The doc comment of a parameter is an ordinary string of the submitting thread, and the arg_info copy carried the pointer over untouched. Nothing freed it while the op_array kept refcount NULL; once every materialized closure got a real refcount, destroy_op_array released a string of another thread on every task. Both copies now carry a string of their own. The rest were the same shape seen once more: literals held their own switch next to op_array_emalloc_copy_value, so a default written as a constant stayed an unevaluated tree in the arena; zend_ast_copy gives a tree its own block but carries the leaves over as they are; the static variables of a nested definition were duplicated shallowly. There is one localizer now, and array, tree and attribute all go through it. Named rather than skipped: a closure written inside a constant expression keeps its op_array in the arena. Three tests. 089 goes red on revert with a corrupted heap; 090 and 091 do not — the freed memory still read as itself — so they record the contract. --- .../089-task_param_doc_comment.phpt | 31 ++++ .../090-task_global_nested_static.phpt | 45 +++++ .../091-task_global_default_constant.phpt | 47 +++++ thread.c | 167 ++++++++++-------- 4 files changed, 213 insertions(+), 77 deletions(-) create mode 100644 tests/thread_pool/089-task_param_doc_comment.phpt create mode 100644 tests/thread_pool/090-task_global_nested_static.phpt create mode 100644 tests/thread_pool/091-task_global_default_constant.phpt diff --git a/tests/thread_pool/089-task_param_doc_comment.phpt b/tests/thread_pool/089-task_param_doc_comment.phpt new file mode 100644 index 0000000..1a79c54 --- /dev/null +++ b/tests/thread_pool/089-task_param_doc_comment.phpt @@ -0,0 +1,31 @@ +--TEST-- +ThreadPool: a parameter doc comment does not follow the task across threads +--SKIPIF-- + +--FILE-- +submit(function (/** @param int */ int $x = 7) { return $x; }))); + var_dump(await($pool->submit(function (/** @param int */ int $x = 8) { return $x; }))); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +int(7) +int(8) +Done diff --git a/tests/thread_pool/090-task_global_nested_static.phpt b/tests/thread_pool/090-task_global_nested_static.phpt new file mode 100644 index 0000000..0bae72f --- /dev/null +++ b/tests/thread_pool/090-task_global_nested_static.phpt @@ -0,0 +1,45 @@ +--TEST-- +ThreadPool: the static of a nested closure keeps its own string +--SKIPIF-- + +--FILE-- +submit(static function() { + $GLOBALS['v'] = (static function() { + static $seed = 'nested-static-seed'; + return $seed; + })(); + + return 'stored'; + })); + + // Allocation pressure, so the freed arena block is handed out again. + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + var_dump(await($pool->submit(static fn() => $GLOBALS['v'] ?? 'gone'))); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +string(18) "nested-static-seed" +Done diff --git a/tests/thread_pool/091-task_global_default_constant.phpt b/tests/thread_pool/091-task_global_default_constant.phpt new file mode 100644 index 0000000..f0a9b27 --- /dev/null +++ b/tests/thread_pool/091-task_global_default_constant.phpt @@ -0,0 +1,47 @@ +--TEST-- +ThreadPool: a default written as a constant is still resolvable after its task +--SKIPIF-- + +--FILE-- + define('TP_RETRIES', 'retries-constant-value'), + coroutine: true, + ); + + await($pool->submit(static function() { + $GLOBALS['f'] = static function($n = TP_RETRIES) { return $n; }; + return 'stored'; + })); + + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + var_dump(await($pool->submit(static function() { + $f = $GLOBALS['f'] ?? null; + return $f === null ? 'gone' : $f(); + }))); + + $pool->close(); + echo "Done\n"; +}); +?> +--EXPECT-- +string(22) "retries-constant-value" +Done diff --git a/thread.c b/thread.c index d9b7919..7be1ab6 100644 --- a/thread.c +++ b/thread.c @@ -611,6 +611,12 @@ static void thread_copy_op_array_ex(thread_copy_ctx_t *ctx, zend_op_array *op_ar if (arg_info[i].name) { arg_info[i].name = thread_copy_string(ctx, arg_info[i].name); } + /* A parameter may carry a doc comment, and the memcpy above brought + * the source thread's string with it. Left as it was, the worker + * releases a string of another thread when it frees the op_array. */ + if (arg_info[i].doc_comment) { + arg_info[i].doc_comment = thread_copy_string(ctx, arg_info[i].doc_comment); + } thread_copy_type(ctx, &arg_info[i].type); } if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) { @@ -2171,10 +2177,24 @@ static void op_array_emalloc_copy_type(zend_type *type) * After this call, the op_array is fully self-contained in emalloc * and the persistent source (snapshot arena) can be freed. */ -/* Rebuild a literal array with strings this thread owns. zend_array_dup copies - * the buckets and stops there: keys and string values keep pointing into the - * snapshot arena, and an interned string is never refcounted, so nothing keeps - * them alive once that arena is gone. */ +/* Everything below rebuilds, in this thread's heap, the parts of a materialized + * op_array that would otherwise keep pointing into the snapshot arena. The + * arena is freed whole when its owner is done with it, and every string it + * holds is marked interned, so a plain copy shares a pointer that nobody keeps + * alive and nobody may free. */ +static void op_array_emalloc_copy_value(zval *dst, const zval *src); + +static zend_string *op_array_emalloc_copy_string(const zend_string *src) +{ + zend_string *copy = zend_string_init(ZSTR_VAL(src), ZSTR_LEN(src), 0); + + /* Precomputed: opcodes that look a literal up by known hash trust key->h + * and never recompute it. */ + zend_string_hash_val(copy); + + return copy; +} + static HashTable *op_array_emalloc_copy_array(const HashTable *src) { HashTable *dst = zend_new_array(zend_hash_num_elements(src)); @@ -2185,25 +2205,10 @@ static HashTable *op_array_emalloc_copy_array(const HashTable *src) ZEND_HASH_FOREACH_KEY_VAL((HashTable *) src, idx, key, val) { zval copy; - - switch (Z_TYPE_P(val)) { - case IS_STRING: { - zend_string *value = zend_string_init(Z_STRVAL_P(val), Z_STRLEN_P(val), 0); - zend_string_hash_val(value); - ZVAL_NEW_STR(©, value); - break; - } - case IS_ARRAY: - ZVAL_ARR(©, op_array_emalloc_copy_array(Z_ARR_P(val))); - break; - default: - ZVAL_COPY(©, val); - break; - } + op_array_emalloc_copy_value(©, val); if (key != NULL) { - zend_string *local = zend_string_init(ZSTR_VAL(key), ZSTR_LEN(key), 0); - zend_string_hash_val(local); + zend_string *local = op_array_emalloc_copy_string(key); zend_hash_add_new(dst, local, ©); zend_string_release(local); } else { @@ -2214,39 +2219,75 @@ static HashTable *op_array_emalloc_copy_array(const HashTable *src) return dst; } -/* Localize a literal value: a string or an array from the snapshot arena is - * rebuilt in this thread's heap, everything else is copied as it is. */ +/* A constant expression is kept as an unevaluated tree until something asks for + * it. zend_ast_copy gives the tree its own block but carries leaf values over + * as they are, so the leaves are rebuilt here. + * + * A tree holding an op_array of its own — a closure inside a constant + * expression — keeps that op_array in the arena. */ +static void op_array_emalloc_localize_ast(zend_ast *ast) +{ + if (ast == NULL) { + return; + } + + if (ast->kind == ZEND_AST_ZVAL || ast->kind == ZEND_AST_CONSTANT) { + zval *leaf = &((zend_ast_zval *) ast)->val; + zval local; + + op_array_emalloc_copy_value(&local, leaf); + ZVAL_COPY_VALUE(leaf, &local); + + return; + } + + if (ast->kind == ZEND_AST_OP_ARRAY || ast->kind == ZEND_AST_CALLABLE_CONVERT) { + return; + } + + if (zend_ast_is_list(ast)) { + const zend_ast_list *list = zend_ast_get_list(ast); + + for (uint32_t i = 0; i < list->children; i++) { + op_array_emalloc_localize_ast(list->child[i]); + } + + return; + } + + const uint32_t children = zend_ast_get_num_children(ast); + + for (uint32_t i = 0; i < children; i++) { + op_array_emalloc_localize_ast(ast->child[i]); + } +} + +/* The one entry point: strings, arrays and constant expressions are rebuilt, + * scalars carry no payload and are taken as they are. */ static void op_array_emalloc_copy_value(zval *dst, const zval *src) { switch (Z_TYPE_P(src)) { - case IS_STRING: { - zend_string *value = zend_string_init(Z_STRVAL_P(src), Z_STRLEN_P(src), 0); - zend_string_hash_val(value); - ZVAL_NEW_STR(dst, value); + case IS_STRING: + ZVAL_NEW_STR(dst, op_array_emalloc_copy_string(Z_STR_P(src))); break; - } case IS_ARRAY: ZVAL_ARR(dst, op_array_emalloc_copy_array(Z_ARR_P(src))); break; - case IS_CONSTANT_AST: - /* An argument written as a constant expression stays unevaluated - * until something asks for it, and the tree it is kept as lives in - * the arena like everything else. */ - ZVAL_AST(dst, zend_ast_copy(Z_ASTVAL_P(src))); + case IS_CONSTANT_AST: { + zend_ast_ref *tree = zend_ast_copy(Z_ASTVAL_P(src)); + op_array_emalloc_localize_ast(GC_AST(tree)); + ZVAL_AST(dst, tree); break; + } default: ZVAL_COPY(dst, src); break; } } -/* Rebuild the attribute table in this thread's heap. The snapshot's table is - * marked immutable with no destructor, so zend_hash_release leaves it alone and - * it dies with the arena — after which reflection reads a freed header. The - * rebuilt one is owned by this op_array and freed with it. - * - * Arguments are localized by op_array_emalloc_copy_value, including the tree of - * one written as a constant expression. */ +/* The attribute table of a materialized op_array. The snapshot's one is marked + * immutable and carries no destructor, so it belongs to the arena; the rebuilt + * one belongs to this op_array and goes with it. */ static HashTable *op_array_emalloc_copy_attributes(const HashTable *src) { HashTable *dst = NULL; @@ -2330,42 +2371,10 @@ static void op_array_to_emalloc(zend_op_array *op_array) * freed memory and segfaults under load. Strings and * arrays are the only refcounted literal types Zend emits * for user op_arrays. */ - const zval *src = &orig_literals[i]; - zval *dst = &new_literals[i]; - switch (Z_TYPE_P(src)) { - case IS_STRING: { - /* Always deep-copy. The IS_STR_INTERNED flag is - * unreliable here: thread_copy_string marks every - * arena-allocated string as INTERNED|PERMANENT to - * skip refcount/release on the source side, so a - * literal that looks interned is actually living - * in the snapshot's persistent arena and will die - * with async_thread_snapshot_destroy() right - * after this function returns. - * - * The hash must be precomputed: INIT_FCALL_SPEC_CONST - * uses zend_hash_find_known_hash which trusts - * key->h without recomputing — a freshly emalloc'd - * string has h=0 and lookup hits bucket 0 with a - * garbage pointer (asserts in debug builds). */ - zend_string *fresh = zend_string_init( - Z_STRVAL_P(src), Z_STRLEN_P(src), 0); - zend_string_hash_val(fresh); - ZVAL_NEW_STR(dst, fresh); - break; - } - case IS_ARRAY: - ZVAL_ARR(dst, op_array_emalloc_copy_array(Z_ARR_P(src))); - break; - default: - /* Scalars (long/double/bool/null) and IS_CONSTANT_AST: - * the latter is resolved into a string/array at - * compile time for closures, so we don't expect it - * here. ZVAL_COPY handles scalars (no payload to - * deep-copy) and AST refcount bump if it ever shows. */ - ZVAL_COPY(dst, src); - break; - } + /* The IS_STR_INTERNED flag says nothing here: every arena + * string carries it so the source side skips refcounting, and + * a literal that looks interned dies with the arena. */ + op_array_emalloc_copy_value(&new_literals[i], &orig_literals[i]); } } op_array->literals = new_literals; @@ -2454,6 +2463,10 @@ static void op_array_to_emalloc(zend_op_array *op_array) new_info[i].name = zend_string_init( ZSTR_VAL(new_info[i].name), ZSTR_LEN(new_info[i].name), 0); } + if (new_info[i].doc_comment) { + new_info[i].doc_comment = zend_string_init( + ZSTR_VAL(new_info[i].doc_comment), ZSTR_LEN(new_info[i].doc_comment), 0); + } op_array_emalloc_copy_type(&new_info[i].type); } if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) { @@ -2500,7 +2513,7 @@ static void op_array_to_emalloc(zend_op_array *op_array) /* Nested defs carry the snapshot's persistent immutable static_variables * (refcount 2); dup into a worker-local array destroy_op_array can free. */ if (op_array->static_variables) { - op_array->static_variables = zend_array_dup(op_array->static_variables); + op_array->static_variables = op_array_emalloc_copy_array(op_array->static_variables); } /* dynamic_func_defs — outer closures with nested function/closure From b79576e4618e0494f4e257a0eb70ceb43395af8b Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 16:44:06 +0000 Subject: [PATCH 05/10] #251: say in the comments what the code is, not what it used to be Three of them talked about the change instead of the state: the doc comment note explained what happened when the pointer was left alone, the localizer's header retold the switch under it, and the call site carried five lines of the bug's story that the block header above already covers. --- thread.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/thread.c b/thread.c index 7be1ab6..771bb78 100644 --- a/thread.c +++ b/thread.c @@ -611,9 +611,9 @@ static void thread_copy_op_array_ex(thread_copy_ctx_t *ctx, zend_op_array *op_ar if (arg_info[i].name) { arg_info[i].name = thread_copy_string(ctx, arg_info[i].name); } - /* A parameter may carry a doc comment, and the memcpy above brought - * the source thread's string with it. Left as it was, the worker - * releases a string of another thread when it frees the op_array. */ + /* The doc comment of a parameter is an ordinary string of the + * submitting thread, and arg_info holds only a pointer to it. The + * worker frees arg_info with its op_array, so it needs its own. */ if (arg_info[i].doc_comment) { arg_info[i].doc_comment = thread_copy_string(ctx, arg_info[i].doc_comment); } @@ -2262,8 +2262,8 @@ static void op_array_emalloc_localize_ast(zend_ast *ast) } } -/* The one entry point: strings, arrays and constant expressions are rebuilt, - * scalars carry no payload and are taken as they are. */ +/* The single localizer. What it writes into `dst` belongs to the caller and is + * freed with the op_array it goes into. */ static void op_array_emalloc_copy_value(zval *dst, const zval *src) { switch (Z_TYPE_P(src)) { @@ -2676,14 +2676,10 @@ void async_thread_create_closure_ex( zend_array_destroy(loaded_vars); } - /* Self-contain the op_array in this thread's heap, always. Two reasons, and - * the second is why there is no condition: nested defs shared with the - * snapshot race on run_time_cache (#176), and anything left pointing into - * the snapshot arena outlives it — the arena is freed when the task ends, - * while what the body stored elsewhere is not. `$GLOBALS['x'] = 1` is - * enough: the key is this op_array's literal, marked interned so the symbol - * table keeps it without a reference, and shutdown then releases a string - * the allocator never handed out (#251). */ + /* Self-contained, always. A nested def shared with the snapshot races on + * run_time_cache (#176), and anything still pointing into the arena + * outlives it: the arena goes with the task, what the body left in the + * thread's state does not (#251). */ async_zend_closure_t *closure = (async_zend_closure_t *) Z_OBJ_P(closure_zv); op_array_to_emalloc(&closure->func.op_array); } From 67a21dea7951b2766ae59d285387b3041c2a46ce Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 17:17:27 +0000 Subject: [PATCH 06/10] #251: carry the attribute validation error, refuse what cannot be carried MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Two findings of the review round. zend_add_attribute leaves validation_error at NULL and the rebuild did not restore it, so a target error deferred by DelayedTargetValidation was raised on the submitting thread and silently absent on the worker. The snapshot already carries the string; the rebuild takes it too now. A first-class callable written into a default value stays an unevaluated tree that names a function resolved against the thread which compiled it, next to that thread's strings and its cached function pointer. Nothing here can give the worker its own, so such a closure is refused at submit. The refusal is partial and is not claimed otherwise: the same script crashed three times out of three in one configuration and, in another, passed without crashing and without reaching the refusal. What decides that is not explained yet, so no test states it — one green either way would be decoration. --- thread.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 65 insertions(+), 4 deletions(-) diff --git a/thread.c b/thread.c index 771bb78..372df7f 100644 --- a/thread.c +++ b/thread.c @@ -1543,6 +1543,45 @@ void async_thread_defer_release_ctx( * reproduce. Recurses into dynamic_func_defs. Throws on first illegal * opcode; sets ASYNC_FN_FLAG_THREAD_TRANSFER_OK on success so subsequent * transfers (ThreadPool resubmits, channel resends) skip the scan. */ +/* True when the tree holds a first-class callable anywhere inside it. */ +static bool async_thread_ast_has_callable_convert(const zend_ast *ast) +{ + if (ast == NULL) { + return false; + } + + if (ast->kind == ZEND_AST_CALLABLE_CONVERT) { + return true; + } + + if (ast->kind == ZEND_AST_ZVAL || ast->kind == ZEND_AST_CONSTANT + || ast->kind == ZEND_AST_OP_ARRAY) { + return false; + } + + if (zend_ast_is_list((zend_ast *) ast)) { + const zend_ast_list *list = zend_ast_get_list((zend_ast *) ast); + + for (uint32_t i = 0; i < list->children; i++) { + if (async_thread_ast_has_callable_convert(list->child[i])) { + return true; + } + } + + return false; + } + + const uint32_t children = zend_ast_get_num_children((zend_ast *) ast); + + for (uint32_t i = 0; i < children; i++) { + if (async_thread_ast_has_callable_convert(ast->child[i])) { + return true; + } + } + + return false; +} + static bool async_thread_check_op_array(zend_op_array *op_array) { if (op_array->type != ZEND_USER_FUNCTION @@ -1576,6 +1615,22 @@ static bool async_thread_check_op_array(zend_op_array *op_array) return false; } + /* A first-class callable written into a default value stays an unevaluated + * tree, and that tree names a function resolved against the thread that + * compiled it, alongside strings and a cached function pointer of that + * thread. The worker cannot be given ones of its own, so the closure is + * refused here, where the caller still has a stack to catch it. */ + for (uint32_t i = 0; i < op_array->last_literal; i++) { + if (Z_TYPE(op_array->literals[i]) == IS_CONSTANT_AST + && async_thread_ast_has_callable_convert(Z_ASTVAL(op_array->literals[i]))) { + zend_throw_error(NULL, + "Cannot transfer closure to another thread: first-class callable in a " + "constant expression at %s", + op_array->filename ? ZSTR_VAL(op_array->filename) : "(closure)"); + return false; + } + } + for (uint32_t i = 0; i < op_array->num_dynamic_func_defs; i++) { if (!async_thread_check_op_array(op_array->dynamic_func_defs[i])) { return false; @@ -2223,8 +2278,8 @@ static HashTable *op_array_emalloc_copy_array(const HashTable *src) * it. zend_ast_copy gives the tree its own block but carries leaf values over * as they are, so the leaves are rebuilt here. * - * A tree holding an op_array of its own — a closure inside a constant - * expression — keeps that op_array in the arena. */ + * A tree of its own kind: a closure or a first-class callable written inside a + * constant expression is not localized, because neither form reaches a worker. */ static void op_array_emalloc_localize_ast(zend_ast *ast) { if (ast == NULL) { @@ -2302,10 +2357,16 @@ static HashTable *op_array_emalloc_copy_attributes(const HashTable *src) zend_string_release(name); + /* zend_add_attribute leaves this NULL. A target error deferred by + * DelayedTargetValidation is raised from this string when the attribute + * is instantiated, and losing it turns the error into silence. */ + if (attr->validation_error != NULL) { + copy->validation_error = op_array_emalloc_copy_string(attr->validation_error); + } + for (uint32_t i = 0; i < attr->argc; i++) { if (attr->args[i].name != NULL) { - copy->args[i].name = zend_string_init( - ZSTR_VAL(attr->args[i].name), ZSTR_LEN(attr->args[i].name), 0); + copy->args[i].name = op_array_emalloc_copy_string(attr->args[i].name); } op_array_emalloc_copy_value(©->args[i].value, &attr->args[i].value); From c1a41e42fe53638136043523215c52f975b24c01 Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 17:22:47 +0000 Subject: [PATCH 07/10] #251: keep u2 on a localized literal, and make two tests catch MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A review round with numbers. The literal copy carried the value and dropped u2. For a literal that word holds the runtime cache slot the VM reads through Z_CACHE_SLOT_P, so a default written as a constant sent RECV_INIT to an arbitrary offset — and wrote there when the value needed no refcount. Valgrind reported it as a use of an uninitialised value on 091; it is silent now. Two claims of mine were wrong and are corrected in the tests. 088 does fail on main, 10 of 10, and catches the attribute table just as 087 does; it is the tree of the argument that it states rather than catches. 089 does not fail on main at all — it catches the intermediate state of this branch, where the copy had become unconditional and the doc comment was not yet carried. The allocation loops rested on a wrong model: the arena is malloc'd and emalloc pressure never reaches it, which is why 090 and 091 stayed green with them. They are gone, and those two now work the arena itself — a literal longer than a block gets a block of its own, the next snapshot takes it back from libc, and a reader still pointing there sees the impostor. Red 3 of 3 on main, green here. The price is a 70 KB literal in each file. --- .../086-task_global_literal_array.phpt | 6 ----- .../087-task_global_closure_attributes.phpt | 6 ----- .../088-task_global_attribute_const_expr.phpt | 7 +++--- .../090-task_global_nested_static.phpt | 22 +++++++++--------- .../091-task_global_default_constant.phpt | 23 ++++++++++--------- thread.c | 5 ++++ 6 files changed, 31 insertions(+), 38 deletions(-) diff --git a/tests/thread_pool/086-task_global_literal_array.phpt b/tests/thread_pool/086-task_global_literal_array.phpt index 02fda81..8cee133 100644 --- a/tests/thread_pool/086-task_global_literal_array.phpt +++ b/tests/thread_pool/086-task_global_literal_array.phpt @@ -24,12 +24,6 @@ spawn(function() { return 'stored'; })); - // Allocation pressure, so the freed arena block is handed out again. - await($pool->submit(static function() { - $junk = []; - for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } - return count($junk); - })); $seen = await($pool->submit(static function() { $arr = $GLOBALS['arr'] ?? []; diff --git a/tests/thread_pool/087-task_global_closure_attributes.phpt b/tests/thread_pool/087-task_global_closure_attributes.phpt index d83d378..6395268 100644 --- a/tests/thread_pool/087-task_global_closure_attributes.phpt +++ b/tests/thread_pool/087-task_global_closure_attributes.phpt @@ -29,12 +29,6 @@ spawn(function() { return 'stored'; })); - await($pool->submit(static function() { - $junk = []; - for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } - return count($junk); - })); - $seen = await($pool->submit(static function() { $fn = $GLOBALS['tagged'] ?? null; diff --git a/tests/thread_pool/088-task_global_attribute_const_expr.phpt b/tests/thread_pool/088-task_global_attribute_const_expr.phpt index 754fedf..943318c 100644 --- a/tests/thread_pool/088-task_global_attribute_const_expr.phpt +++ b/tests/thread_pool/088-task_global_attribute_const_expr.phpt @@ -21,10 +21,9 @@ use function Async\spawn; use function Async\await; // Such an argument is kept as an unevaluated tree until something asks for it, -// and that tree lived in the snapshot arena. Unlike the plain cases this one -// does not fail on the old code — the freed tree still read as itself, and -// valgrind reported nothing — so it records the contract rather than catching -// the defect. +// and the table holding it lived in the snapshot arena. What this catches is +// the attribute table, the same defect as the test before it; the tree of the +// argument is the part it states rather than catches. spawn(function() { $pool = new ThreadPool(workers: 1, coroutine: true); diff --git a/tests/thread_pool/090-task_global_nested_static.phpt b/tests/thread_pool/090-task_global_nested_static.phpt index 0bae72f..b11226f 100644 --- a/tests/thread_pool/090-task_global_nested_static.phpt +++ b/tests/thread_pool/090-task_global_nested_static.phpt @@ -1,5 +1,5 @@ --TEST-- -ThreadPool: the static of a nested closure keeps its own string +ThreadPool: the static of a nested closure keeps its own string (arena-block reuse) --SKIPIF-- submit(static function() { $GLOBALS['v'] = (static function() { - static $seed = 'nested-static-seed'; + static $seed = 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aaaaaa'; return $seed; })(); return 'stored'; })); - // Allocation pressure, so the freed arena block is handed out again. await($pool->submit(static function() { - $junk = []; - for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } - return count($junk); + $x = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX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XXXXXX'; + return strlen($x); })); - var_dump(await($pool->submit(static fn() => $GLOBALS['v'] ?? 'gone'))); + $v = await($pool->submit(static fn() => $GLOBALS['v'] ?? 'gone')); + var_dump(is_string($v) ? substr($v, 0, 10) . '|' . strlen($v) : $v); $pool->close(); echo "Done\n"; }); ?> --EXPECT-- -string(18) "nested-static-seed" +string(16) "seed-aaaaa|70005" Done diff --git a/tests/thread_pool/091-task_global_default_constant.phpt b/tests/thread_pool/091-task_global_default_constant.phpt index f0a9b27..bae60c6 100644 --- a/tests/thread_pool/091-task_global_default_constant.phpt +++ b/tests/thread_pool/091-task_global_default_constant.phpt @@ -1,5 +1,5 @@ --TEST-- -ThreadPool: a default written as a constant is still resolvable after its task +ThreadPool: a default built from a constant expression survives arena-block reuse --SKIPIF-- submit(static function() { - $GLOBALS['f'] = static function($n = TP_RETRIES) { return $n; }; + $GLOBALS['f'] = static function($n = TP_RETRIES . '-cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc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cc') { return $n; }; return 'stored'; })); await($pool->submit(static function() { - $junk = []; - for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } - return count($junk); + $x = 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD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DDDDDDDDDDDDDDDDDDDDD'; + return strlen($x); })); - var_dump(await($pool->submit(static function() { + $v = await($pool->submit(static function() { $f = $GLOBALS['f'] ?? null; return $f === null ? 'gone' : $f(); - }))); + })); + var_dump(is_string($v) ? substr($v, 0, 24) . '|' . strlen($v) : $v); $pool->close(); echo "Done\n"; }); ?> --EXPECT-- -string(22) "retries-constant-value" +string(30) "retries-constant-value-c|70023" Done diff --git a/thread.c b/thread.c index 372df7f..7913d39 100644 --- a/thread.c +++ b/thread.c @@ -2436,6 +2436,11 @@ static void op_array_to_emalloc(zend_op_array *op_array) * string carries it so the source side skips refcounting, and * a literal that looks interned dies with the arena. */ op_array_emalloc_copy_value(&new_literals[i], &orig_literals[i]); + + /* u2 is not part of the value: for a literal it holds the + * runtime cache slot the VM reads through Z_CACHE_SLOT_P, so + * losing it sends that read to an arbitrary offset. */ + new_literals[i].u2 = orig_literals[i].u2; } } op_array->literals = new_literals; From 225bf13037a57cf31b0534b785684767535b4a14 Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Wed, 19 Aug 2026 18:40:32 +0000 Subject: [PATCH 08/10] #251: refuse a first-class callable wherever a constant expression can hold it The scan read op_array->literals alone, so a partial application written into an attribute argument reached the worker and asserted on a function pointer resolved against another thread. It now reads the static variables and the attributes too, and descends into array values. Test files renumbered to 093-101: 084-092 are taken by the cancellation branch, which merges first. --- CHANGELOG.md | 2 +- ...lobal.phpt => 093-task_writes_global.phpt} | 0 ...=> 094-task_stores_closure_in_global.phpt} | 0 ...hpt => 095-task_global_literal_array.phpt} | 0 ...> 096-task_global_closure_attributes.phpt} | 0 ...097-task_global_attribute_const_expr.phpt} | 0 ...t.phpt => 098-task_param_doc_comment.phpt} | 0 ...hpt => 099-task_global_nested_static.phpt} | 0 ... => 100-task_global_default_constant.phpt} | 0 .../101-task_partial_application_refused.phpt | 56 ++++++++++++ thread.c | 85 ++++++++++++++++--- 11 files changed, 128 insertions(+), 15 deletions(-) rename tests/thread_pool/{084-task_writes_global.phpt => 093-task_writes_global.phpt} (100%) rename tests/thread_pool/{085-task_stores_closure_in_global.phpt => 094-task_stores_closure_in_global.phpt} (100%) rename tests/thread_pool/{086-task_global_literal_array.phpt => 095-task_global_literal_array.phpt} (100%) rename tests/thread_pool/{087-task_global_closure_attributes.phpt => 096-task_global_closure_attributes.phpt} (100%) rename tests/thread_pool/{088-task_global_attribute_const_expr.phpt => 097-task_global_attribute_const_expr.phpt} (100%) rename tests/thread_pool/{089-task_param_doc_comment.phpt => 098-task_param_doc_comment.phpt} (100%) rename tests/thread_pool/{090-task_global_nested_static.phpt => 099-task_global_nested_static.phpt} (100%) rename tests/thread_pool/{091-task_global_default_constant.phpt => 100-task_global_default_constant.phpt} (100%) create mode 100644 tests/thread_pool/101-task_partial_application_refused.phpt diff --git a/CHANGELOG.md b/CHANGELOG.md index 6e8a3c9..746d6ea 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -10,7 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0 ### Fixed - **`ThreadPool::getWorkerCount()` reported the number of workers the pool was constructed with, whatever became of the threads afterwards** (#231). It now counts the workers that are running, so a closed pool reports 0 once its threads have drained, and no test could state "no worker died" before, because the value that says so did not exist. `reload()` sizes its cohort from that count instead of the constructed one, so a pool that lost a thread no longer waits for an exit token nobody will post, and it reports a rotation that left the pool with no worker at all. `submit()` and `map()` on an open pool with no live worker throw `Async\ThreadPoolException` instead of accepting a task whose Future never settles. -- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. Two more of the same shape went with it: a literal array kept its keys and string values in the arena, so reading one back gave a garbage length, and the attribute table was left there whole, so reflection on a surviving closure read a freed header. +- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. Two more of the same shape went with it: a literal array kept its keys and string values in the arena, so reading one back gave a garbage length, and the attribute table was left there whole, so reflection on a surviving closure read a freed header. The same localization covers the rest of what a materialized closure carries: parameter doc comments, the static variables of nested definitions, and defaults built from a constant expression. A first-class callable or a partial application inside such an expression cannot be localized at all, because its tree names a function resolved against the compiling thread, so a closure carrying one is refused on transfer — in a parameter default and in an attribute argument alike. - **The GC threshold grew by 10000 after every full root buffer in async mode and never came back down**, so collections ran further and further apart and the memory amplitude grew with them until a long-running server reached `memory_limit` (#234). A collection in async mode is handed to the GC coroutine and reports 0 collected nodes to the caller that triggered it, so the threshold is now adjusted inside that coroutine, from the count it actually collected. - **A value set on `root_context()` was invisible to `current_context()->find()` in an HTTP handler.** The walk up the Scope chain ended at the first Scope holding no Context of its own, and a Scope receives a Context only when someone asks for one. A handler runs under a per-request Scope below the server's Scope, and neither of those two had ever touched its Context, so the walk stopped two links short of the main Scope while `root_context()` kept answering, because it reads the main Scope's Context directly (#237). Scopes without a Context are now skipped instead of ending the walk. Reproduced with main scope -> `Scope::inherit()` -> `Scope::inherit()` -> coroutine: `null` before the fix, the stored value after. - **The Context stubs described a store that does not exist.** `Context` was documented as immutable with `set()` and `unset()` returning new instances, `has()` as reading the local Context alone, `get()` as reading it alone as well, and `current_context()` as the coroutine's own Context. `set()` and `unset()` change the Context in place and return it, `get()` and `has()` read the Scopes above too, and the coroutine's own Context comes from `coroutine_context()`. `Scope::__construct()` now carries a contract of its own: a `new Scope()` has no parent, so lookup from inside it never reaches the main Scope, `request_context()` is null there, and disposal cancels running coroutines until `allowZombies()` is called. diff --git a/tests/thread_pool/084-task_writes_global.phpt b/tests/thread_pool/093-task_writes_global.phpt similarity index 100% rename from tests/thread_pool/084-task_writes_global.phpt rename to tests/thread_pool/093-task_writes_global.phpt diff --git a/tests/thread_pool/085-task_stores_closure_in_global.phpt b/tests/thread_pool/094-task_stores_closure_in_global.phpt similarity index 100% rename from tests/thread_pool/085-task_stores_closure_in_global.phpt rename to tests/thread_pool/094-task_stores_closure_in_global.phpt diff --git a/tests/thread_pool/086-task_global_literal_array.phpt b/tests/thread_pool/095-task_global_literal_array.phpt similarity index 100% rename from tests/thread_pool/086-task_global_literal_array.phpt rename to tests/thread_pool/095-task_global_literal_array.phpt diff --git a/tests/thread_pool/087-task_global_closure_attributes.phpt b/tests/thread_pool/096-task_global_closure_attributes.phpt similarity index 100% rename from tests/thread_pool/087-task_global_closure_attributes.phpt rename to tests/thread_pool/096-task_global_closure_attributes.phpt diff --git a/tests/thread_pool/088-task_global_attribute_const_expr.phpt b/tests/thread_pool/097-task_global_attribute_const_expr.phpt similarity index 100% rename from tests/thread_pool/088-task_global_attribute_const_expr.phpt rename to tests/thread_pool/097-task_global_attribute_const_expr.phpt diff --git a/tests/thread_pool/089-task_param_doc_comment.phpt b/tests/thread_pool/098-task_param_doc_comment.phpt similarity index 100% rename from tests/thread_pool/089-task_param_doc_comment.phpt rename to tests/thread_pool/098-task_param_doc_comment.phpt diff --git a/tests/thread_pool/090-task_global_nested_static.phpt b/tests/thread_pool/099-task_global_nested_static.phpt similarity index 100% rename from tests/thread_pool/090-task_global_nested_static.phpt rename to tests/thread_pool/099-task_global_nested_static.phpt diff --git a/tests/thread_pool/091-task_global_default_constant.phpt b/tests/thread_pool/100-task_global_default_constant.phpt similarity index 100% rename from tests/thread_pool/091-task_global_default_constant.phpt rename to tests/thread_pool/100-task_global_default_constant.phpt diff --git a/tests/thread_pool/101-task_partial_application_refused.phpt b/tests/thread_pool/101-task_partial_application_refused.phpt new file mode 100644 index 0000000..89fb818 --- /dev/null +++ b/tests/thread_pool/101-task_partial_application_refused.phpt @@ -0,0 +1,56 @@ +--TEST-- +ThreadPool: a partial application in a constant expression is refused, in a default and in an attribute +--SKIPIF-- + +--FILE-- + static function($cb = tp_target(?, 'z')) { return $cb('q'); }, + 'default in an array' => static function($cb = [tp_target(?, 'z')]) { return $cb[0]('q'); }, + 'attribute' => #[TpMark(tp_target(?, 'z'))] static function() { return 'ran'; }, + 'nested default' => static function() { + $g = static function($cb = tp_target(?, 'z')) { return $cb('q'); }; + return $g(); + }, + 'plain closure' => static function() { return 'ran'; }, + ]; + + foreach ($cases as $name => $closure) { + try { + $pool->submit($closure); + echo $name, ": accepted\n"; + } catch (\Throwable $e) { + echo $name, ": ", get_class($e), "\n"; + } + } + + $pool->close(); +}); + +?> +--EXPECT-- +default: Async\ThreadPoolException +default in an array: Async\ThreadPoolException +attribute: Async\ThreadPoolException +nested default: Async\ThreadPoolException +plain closure: accepted diff --git a/thread.c b/thread.c index 7913d39..88c2cf6 100644 --- a/thread.c +++ b/thread.c @@ -1582,6 +1582,71 @@ static bool async_thread_ast_has_callable_convert(const zend_ast *ast) return false; } +/* A constant expression is stored either as the tree itself or nested inside an + * array value. */ +static bool async_thread_zval_has_callable_convert(const zval *value) +{ + if (Z_TYPE_P(value) == IS_CONSTANT_AST) { + return async_thread_ast_has_callable_convert(Z_ASTVAL_P(value)); + } + + if (Z_TYPE_P(value) == IS_ARRAY) { + const zval *item; + + ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(value), item) { + if (async_thread_zval_has_callable_convert(item)) { + return true; + } + } ZEND_HASH_FOREACH_END(); + } + + return false; +} + +/* A first-class callable written into a constant expression stays an unevaluated + * tree, and that tree names a function resolved against the thread that compiled + * it, alongside strings and a cached function pointer of that thread. The worker + * cannot be given ones of its own, so a closure carrying one is refused on + * transfer, while the caller still has a stack to catch it. + * + * Three tables of an op_array can hold a constant expression: a parameter + * default lands in the literals, the initializer of a static variable in the + * static variables, an attribute argument in the attributes. */ +static bool async_thread_op_array_has_callable_convert(const zend_op_array *op_array) +{ + for (uint32_t i = 0; i < op_array->last_literal; i++) { + if (async_thread_zval_has_callable_convert(&op_array->literals[i])) { + return true; + } + } + + if (op_array->static_variables != NULL) { + const zval *value; + + ZEND_HASH_FOREACH_VAL(op_array->static_variables, value) { + if (async_thread_zval_has_callable_convert(value)) { + return true; + } + } ZEND_HASH_FOREACH_END(); + } + + if (op_array->attributes != NULL) { + const zval *slot; + + ZEND_HASH_PACKED_FOREACH_VAL(op_array->attributes, slot) { + const zend_attribute *attr = Z_PTR_P(slot); + + for (uint32_t i = 0; i < attr->argc; i++) { + if (async_thread_zval_has_callable_convert(&attr->args[i].value)) { + return true; + } + } + } ZEND_HASH_FOREACH_END(); + } + + return false; +} + static bool async_thread_check_op_array(zend_op_array *op_array) { if (op_array->type != ZEND_USER_FUNCTION @@ -1615,20 +1680,12 @@ static bool async_thread_check_op_array(zend_op_array *op_array) return false; } - /* A first-class callable written into a default value stays an unevaluated - * tree, and that tree names a function resolved against the thread that - * compiled it, alongside strings and a cached function pointer of that - * thread. The worker cannot be given ones of its own, so the closure is - * refused here, where the caller still has a stack to catch it. */ - for (uint32_t i = 0; i < op_array->last_literal; i++) { - if (Z_TYPE(op_array->literals[i]) == IS_CONSTANT_AST - && async_thread_ast_has_callable_convert(Z_ASTVAL(op_array->literals[i]))) { - zend_throw_error(NULL, - "Cannot transfer closure to another thread: first-class callable in a " - "constant expression at %s", - op_array->filename ? ZSTR_VAL(op_array->filename) : "(closure)"); - return false; - } + if (UNEXPECTED(async_thread_op_array_has_callable_convert(op_array))) { + zend_throw_error(NULL, + "Cannot transfer closure to another thread: first-class callable in a " + "constant expression at %s", + op_array->filename ? ZSTR_VAL(op_array->filename) : "(closure)"); + return false; } for (uint32_t i = 0; i < op_array->num_dynamic_func_defs; i++) { From 04c779c6c38a11eaeb384a3eb5b1dc36e8a04e89 Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Thu, 20 Aug 2026 08:59:57 +0000 Subject: [PATCH 09/10] #251: refuse a closure written into a constant expression zend_ast_copy copies the tree and carries the op_array pointer over, so a closure written into a parameter default or an attribute argument kept its body in the snapshot arena, and a task storing one crashed the worker as soon as the arena was reused. The same form also passed the declaration check, which recurses into dynamic_func_defs and does not read constant expressions, so a class declared inside it reached the worker and asserted in do_bind_class. The refusal reports which form it found, first-class callable or closure, and test 101 asserts that reason instead of the exception class alone. Two invariants the localizer depends on are stated as asserts: the arena copy of a zend_ast_ref must be adjacent to its tree, and a rebuilt table must have no hole to skip, because BIND_LEXICAL addresses a captured variable by a byte offset computed at compile time. Two block comments had a new helper inserted between them and the function they describe; each is back above its own. --- CHANGELOG.md | 2 +- .../101-task_const_expr_function_refused.phpt | 42 ++++-- thread.c | 140 +++++++++++------- 3 files changed, 118 insertions(+), 66 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index e6dce10..d95defb 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0 - **A `ThreadPool` task in coroutine mode left its un-awaited children running on the worker** (#245). The per-task scope inherited `DISPOSE_SAFELY`, so a leftover child was zombified rather than cancelled, and nothing reached that scope's disposal anyway while the child was alive: the awaiter had its result and the child went on running, out of the active count and past the worker's drain. The sync path already cancelled at task end; both modes now answer the same. - **`pdo_mysql/009-pdo_cancellation` cancelled on a wall clock and failed whenever the runner was busy** (#247). The test slept a fixed 100 ms before cancelling, so its expected output claimed that connecting to MySQL finishes inside that budget; on CI it does not, and the cancellation landed during connect. The coroutine now says when the query is under way and the caller waits for that. Test only. - **Cancelling a `ThreadPool` task's Future left the task running on the worker** (#233). `cancel()` rejected the Future on the submitting thread and nothing reached the worker at all: the task ran to its end, and everything it had captured stayed alive with it — a subscription, a connection, a file handle, held by a run whose caller had already given up. Measured: a task with `delay(800)`, cancelled at 200 ms, still printed its last line; a task cancelled while queued was executed in full. The shared state now carries a cancellation back to the producer, and the worker cancels the coroutine serving it — in both modes, and before unpacking the closure at all when the task is still queued. An awaiter that goes away without calling `cancel()` counts as one too, which is the common case: a cancelled scope or an expired timeout unwinds the coroutine and drops the Future. A Future nobody ever subscribed to is left alone, so `submit()` without awaiting keeps running as before, and `ignore()` opts out explicitly. -- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. Two more of the same shape went with it: a literal array kept its keys and string values in the arena, so reading one back gave a garbage length, and the attribute table was left there whole, so reflection on a surviving closure read a freed header. The same localization covers the rest of what a materialized closure carries: parameter doc comments, the static variables of nested definitions, and defaults built from a constant expression. A function written into such an expression cannot be localized at all: a first-class callable or a partial application names a function resolved against the compiling thread, and a closure is an op_array the tree points at rather than owns, so it stayed in the arena and took the worker down with it. A closure carrying either form is refused on transfer — in a parameter default and in an attribute argument alike. +- **A `ThreadPool` task writing into `$GLOBALS` crashed the worker at shutdown** (#251). The key it stored was a literal from the task's own `op_array`, which lives in the snapshot arena and is freed with the task; the string is marked interned, so the symbol table kept it without a reference. While that memory stayed untouched the key still read as interned and nothing happened, so one such task was harmless; the next task reused the block, the header was overwritten, and shutdown handed the allocator a pointer it never issued — `zend_mm_heap corrupted`, then a crash. The same dangling key also broke the lookup, so the value written by one task read as absent in the next. A materialized closure no longer shares anything with the snapshot arena, which also makes a closure left in the worker's state callable from a later task. Two more of the same shape went with it: a literal array kept its keys and string values in the arena, so reading one back gave a garbage length, and the attribute table was left there whole, so reflection on a surviving closure read a freed header. The same localization covers the rest of what a materialized closure carries: parameter doc comments, the static variables of nested definitions, and defaults built from a constant expression. A function written into such an expression cannot be localized at all: a first-class callable or a partial application names a function resolved against the compiling thread, and a closure is an op_array the tree points at rather than owns, so it was left in the arena and the worker crashed on it once the arena was reused. A closure carrying either form is refused on transfer — in a parameter default and in an attribute argument alike. - **The GC threshold grew by 10000 after every full root buffer in async mode and never came back down**, so collections ran further and further apart and the memory amplitude grew with them until a long-running server reached `memory_limit` (#234). A collection in async mode is handed to the GC coroutine and reports 0 collected nodes to the caller that triggered it, so the threshold is now adjusted inside that coroutine, from the count it actually collected. - **A value set on `root_context()` was invisible to `current_context()->find()` in an HTTP handler.** The walk up the Scope chain ended at the first Scope holding no Context of its own, and a Scope receives a Context only when someone asks for one. A handler runs under a per-request Scope below the server's Scope, and neither of those two had ever touched its Context, so the walk stopped two links short of the main Scope while `root_context()` kept answering, because it reads the main Scope's Context directly (#237). Scopes without a Context are now skipped instead of ending the walk. Reproduced with main scope -> `Scope::inherit()` -> `Scope::inherit()` -> coroutine: `null` before the fix, the stored value after. - **The Context stubs described a store that does not exist.** `Context` was documented as immutable with `set()` and `unset()` returning new instances, `has()` as reading the local Context alone, `get()` as reading it alone as well, and `current_context()` as the coroutine's own Context. `set()` and `unset()` change the Context in place and return it, `get()` and `has()` read the Scopes above too, and the coroutine's own Context comes from `coroutine_context()`. `Scope::__construct()` now carries a contract of its own: a `new Scope()` has no parent, so lookup from inside it never reaches the main Scope, `request_context()` is null there, and disposal cancels running coroutines until `allowZombies()` is called. diff --git a/tests/thread_pool/101-task_const_expr_function_refused.phpt b/tests/thread_pool/101-task_const_expr_function_refused.phpt index 89fb818..9ca677c 100644 --- a/tests/thread_pool/101-task_const_expr_function_refused.phpt +++ b/tests/thread_pool/101-task_const_expr_function_refused.phpt @@ -1,5 +1,5 @@ --TEST-- -ThreadPool: a partial application in a constant expression is refused, in a default and in an attribute +ThreadPool: a function written into a constant expression is refused on transfer --SKIPIF-- static function($cb = tp_target(?, 'z')) { return $cb('q'); }, - 'default in an array' => static function($cb = [tp_target(?, 'z')]) { return $cb[0]('q'); }, - 'attribute' => #[TpMark(tp_target(?, 'z'))] static function() { return 'ran'; }, + 'first-class callable' => static function($cb = tp_target(...)) { return $cb('q', 'z'); }, + 'partial application' => static function($cb = tp_target(?, 'z')) { return $cb('q'); }, + 'partial in an array' => static function($cb = [tp_target(?, 'z')]) { return $cb[0]('q'); }, + 'attribute argument' => #[TpMark(tp_target(?, 'z'))] static function() { return 'ran'; }, 'nested default' => static function() { $g = static function($cb = tp_target(?, 'z')) { return $cb('q'); }; return $g(); }, + 'closure' => static function($f = static function() { return 'inner'; }) { return $f(); }, + 'closure in an attribute' => #[TpMark(static function() { return 'inner'; })] static function() { return 'ran'; }, 'plain closure' => static function() { return 'ran'; }, ]; @@ -40,7 +50,8 @@ spawn(function() { $pool->submit($closure); echo $name, ": accepted\n"; } catch (\Throwable $e) { - echo $name, ": ", get_class($e), "\n"; + $reason = $e->getPrevious()?->getMessage() ?? $e->getMessage(); + echo $name, ": ", get_class($e), ": ", strstr($reason, ' at ', true) ?: $reason, "\n"; } } @@ -49,8 +60,11 @@ spawn(function() { ?> --EXPECT-- -default: Async\ThreadPoolException -default in an array: Async\ThreadPoolException -attribute: Async\ThreadPoolException -nested default: Async\ThreadPoolException +first-class callable: Async\ThreadPoolException: Cannot transfer closure to another thread: first-class callable in a constant expression +partial application: Async\ThreadPoolException: Cannot transfer closure to another thread: first-class callable in a constant expression +partial in an array: Async\ThreadPoolException: Cannot transfer closure to another thread: first-class callable in a constant expression +attribute argument: Async\ThreadPoolException: Cannot transfer closure to another thread: first-class callable in a constant expression +nested default: Async\ThreadPoolException: Cannot transfer closure to another thread: first-class callable in a constant expression +closure: Async\ThreadPoolException: Cannot transfer closure to another thread: closure in a constant expression +closure in an attribute: Async\ThreadPoolException: Cannot transfer closure to another thread: closure in a constant expression plain closure: accepted diff --git a/thread.c b/thread.c index 88c2cf6..036a2a6 100644 --- a/thread.c +++ b/thread.c @@ -291,7 +291,14 @@ static void thread_copy_zval(thread_copy_ctx_t *ctx, zval *z) } else { zend_ast_ref *old_ref = Z_AST_P(z); Z_AST_P(z) = thread_persist_copy_xlat(ctx, Z_AST_P(z), sizeof(zend_ast_ref)); - thread_copy_ast(ctx, GC_AST(old_ref)); + + /* GC_AST reads the tree from just past the header, so the two + * allocations have to be neighbours. The arena bumps a pointer + * and normally makes them so; it opens a fresh block when a + * request does not fit, and a header landing in the last bytes + * of a block would leave the root behind in the old one. */ + const zend_ast *root = thread_copy_ast(ctx, GC_AST(old_ref)); + ZEND_ASSERT(root == GC_AST(Z_AST_P(z))); Z_TYPE_FLAGS_P(z) = 0; GC_SET_REFCOUNT(Z_COUNTED_P(z), 1); GC_ADD_FLAGS(Z_COUNTED_P(z), GC_IMMUTABLE); @@ -1538,85 +1545,93 @@ void async_thread_defer_release_ctx( /// 1. Snapshot — transfer callable between threads /////////////////////////////////////////////////////////// -/* Reject opcodes whose snapshot replay would assert in the worker: - * class/function declarations need compile-time class_table state we don't - * reproduce. Recurses into dynamic_func_defs. Throws on first illegal - * opcode; sets ASYNC_FN_FLAG_THREAD_TRANSFER_OK on success so subsequent - * transfers (ThreadPool resubmits, channel resends) skip the scan. */ -/* True when the tree holds a first-class callable anywhere inside it. */ -static bool async_thread_ast_has_callable_convert(const zend_ast *ast) +/* A function value written into a constant expression belongs to the thread + * that compiled it: a first-class callable names a function resolved against + * that thread's function table and caches its zend_function beside the name, + * and a closure is an op_array the tree points at rather than owns. Neither + * can be given to the worker, so a closure carrying one is refused on + * transfer, while the caller still has a stack to catch it. + * + * The three below answer with the word for the error message, or NULL when the + * tree holds neither form. */ +static const char *async_thread_ast_unshareable_function(const zend_ast *ast) { if (ast == NULL) { - return false; + return NULL; } if (ast->kind == ZEND_AST_CALLABLE_CONVERT) { - return true; + return "first-class callable"; } - if (ast->kind == ZEND_AST_ZVAL || ast->kind == ZEND_AST_CONSTANT - || ast->kind == ZEND_AST_OP_ARRAY) { - return false; + if (ast->kind == ZEND_AST_OP_ARRAY) { + return "closure"; + } + + if (ast->kind == ZEND_AST_ZVAL || ast->kind == ZEND_AST_CONSTANT) { + return NULL; } if (zend_ast_is_list((zend_ast *) ast)) { const zend_ast_list *list = zend_ast_get_list((zend_ast *) ast); for (uint32_t i = 0; i < list->children; i++) { - if (async_thread_ast_has_callable_convert(list->child[i])) { - return true; + const char *found = async_thread_ast_unshareable_function(list->child[i]); + + if (found != NULL) { + return found; } } - return false; + return NULL; } const uint32_t children = zend_ast_get_num_children((zend_ast *) ast); for (uint32_t i = 0; i < children; i++) { - if (async_thread_ast_has_callable_convert(ast->child[i])) { - return true; + const char *found = async_thread_ast_unshareable_function(ast->child[i]); + + if (found != NULL) { + return found; } } - return false; + return NULL; } /* A constant expression is stored either as the tree itself or nested inside an * array value. */ -static bool async_thread_zval_has_callable_convert(const zval *value) +static const char *async_thread_zval_unshareable_function(const zval *value) { if (Z_TYPE_P(value) == IS_CONSTANT_AST) { - return async_thread_ast_has_callable_convert(Z_ASTVAL_P(value)); + return async_thread_ast_unshareable_function(Z_ASTVAL_P(value)); } if (Z_TYPE_P(value) == IS_ARRAY) { const zval *item; ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(value), item) { - if (async_thread_zval_has_callable_convert(item)) { - return true; + const char *found = async_thread_zval_unshareable_function(item); + + if (found != NULL) { + return found; } } ZEND_HASH_FOREACH_END(); } - return false; + return NULL; } -/* A first-class callable written into a constant expression stays an unevaluated - * tree, and that tree names a function resolved against the thread that compiled - * it, alongside strings and a cached function pointer of that thread. The worker - * cannot be given ones of its own, so a closure carrying one is refused on - * transfer, while the caller still has a stack to catch it. - * - * Three tables of an op_array can hold a constant expression: a parameter +/* Three tables of an op_array can hold a constant expression: a parameter * default lands in the literals, the initializer of a static variable in the * static variables, an attribute argument in the attributes. */ -static bool async_thread_op_array_has_callable_convert(const zend_op_array *op_array) +static const char *async_thread_op_array_unshareable_function(const zend_op_array *op_array) { for (uint32_t i = 0; i < op_array->last_literal; i++) { - if (async_thread_zval_has_callable_convert(&op_array->literals[i])) { - return true; + const char *found = async_thread_zval_unshareable_function(&op_array->literals[i]); + + if (found != NULL) { + return found; } } @@ -1624,8 +1639,10 @@ static bool async_thread_op_array_has_callable_convert(const zend_op_array *op_a const zval *value; ZEND_HASH_FOREACH_VAL(op_array->static_variables, value) { - if (async_thread_zval_has_callable_convert(value)) { - return true; + const char *found = async_thread_zval_unshareable_function(value); + + if (found != NULL) { + return found; } } ZEND_HASH_FOREACH_END(); } @@ -1637,16 +1654,23 @@ static bool async_thread_op_array_has_callable_convert(const zend_op_array *op_a const zend_attribute *attr = Z_PTR_P(slot); for (uint32_t i = 0; i < attr->argc; i++) { - if (async_thread_zval_has_callable_convert(&attr->args[i].value)) { - return true; + const char *found = async_thread_zval_unshareable_function(&attr->args[i].value); + + if (found != NULL) { + return found; } } } ZEND_HASH_FOREACH_END(); } - return false; + return NULL; } +/* Reject opcodes whose snapshot replay would assert in the worker: + * class/function declarations need compile-time class_table state we don't + * reproduce. Recurses into dynamic_func_defs. Throws on first illegal + * opcode; sets ASYNC_FN_FLAG_THREAD_TRANSFER_OK on success so subsequent + * transfers (ThreadPool resubmits, channel resends) skip the scan. */ static bool async_thread_check_op_array(zend_op_array *op_array) { if (op_array->type != ZEND_USER_FUNCTION @@ -1680,10 +1704,12 @@ static bool async_thread_check_op_array(zend_op_array *op_array) return false; } - if (UNEXPECTED(async_thread_op_array_has_callable_convert(op_array))) { + const char *unshareable = async_thread_op_array_unshareable_function(op_array); + + if (UNEXPECTED(unshareable != NULL)) { zend_throw_error(NULL, - "Cannot transfer closure to another thread: first-class callable in a " - "constant expression at %s", + "Cannot transfer closure to another thread: %s in a constant expression at %s", + unshareable, op_array->filename ? ZSTR_VAL(op_array->filename) : "(closure)"); return false; } @@ -2284,11 +2310,6 @@ static void op_array_emalloc_copy_type(zend_type *type) } } -/** - * Copy op_array internals from persistent/arena memory into emalloc. - * After this call, the op_array is fully self-contained in emalloc - * and the persistent source (snapshot arena) can be freed. - */ /* Everything below rebuilds, in this thread's heap, the parts of a materialized * op_array that would otherwise keep pointing into the snapshot arena. The * arena is freed whole when its owner is done with it, and every string it @@ -2300,15 +2321,26 @@ static zend_string *op_array_emalloc_copy_string(const zend_string *src) { zend_string *copy = zend_string_init(ZSTR_VAL(src), ZSTR_LEN(src), 0); - /* Precomputed: opcodes that look a literal up by known hash trust key->h - * and never recompute it. */ + /* Precomputed: INIT_FCALL_SPEC_CONST and its kin look a literal up with + * zend_hash_find_known_hash, which trusts key->h and never recomputes it. + * A fresh string carries h == 0 and would send every such lookup to bucket + * 0, onto whatever pointer lives there. */ zend_string_hash_val(copy); return copy; } +/* Rebuilds a literal array or the static variables of a nested definition. + * + * The bucket order carries meaning for the second of those: BIND_LEXICAL + * addresses a captured variable by a byte offset into arData, computed when the + * closure was compiled. The rebuild keeps the order but cannot keep a hole, and + * the compiler leaves none — it seeds every slot — which is what the assert + * states. */ static HashTable *op_array_emalloc_copy_array(const HashTable *src) { + ZEND_ASSERT(zend_hash_num_elements(src) == src->nNumUsed); + HashTable *dst = zend_new_array(zend_hash_num_elements(src)); zend_string *key; @@ -2335,8 +2367,9 @@ static HashTable *op_array_emalloc_copy_array(const HashTable *src) * it. zend_ast_copy gives the tree its own block but carries leaf values over * as they are, so the leaves are rebuilt here. * - * A tree of its own kind: a closure or a first-class callable written inside a - * constant expression is not localized, because neither form reaches a worker. */ + * Two leaf kinds are passed over: a closure and a first-class callable written + * inside a constant expression name a function of the compiling thread, and + * async_thread_check_op_array refuses the transfer before a worker sees one. */ static void op_array_emalloc_localize_ast(zend_ast *ast) { if (ast == NULL) { @@ -2433,6 +2466,11 @@ static HashTable *op_array_emalloc_copy_attributes(const HashTable *src) return dst; } +/** + * Copy op_array internals from persistent/arena memory into emalloc. + * After this call, the op_array is fully self-contained in emalloc + * and the persistent source (snapshot arena) can be freed. + */ static void op_array_to_emalloc(zend_op_array *op_array) { /* refcount — own copy */ From b0f85df0c70c206e257bfc368962214946951ca1 Mon Sep 17 00:00:00 2001 From: Edmond <1571649+edmonddantes@users.noreply.github.com> Date: Thu, 20 Aug 2026 09:00:06 +0000 Subject: [PATCH 10/10] #251: make the const-expr and doc-comment tests catch what they state 097 read a class constant. The compiler folds one away when OPcache is absent, leaving no tree to test, and OPcache suppresses the folding but the worker has no such class, so the test either proved nothing or failed; CI took the second branch. The name in the tree is now a constant defined at run time, which cannot be folded, and the bootloader gives the worker the same constant. 098 asserted only that the task ran. It now submits from an eval'd unit and drops the unit, so nothing owns the doc comment the worker holds: before the fix the worker reads a freed header and reports "Out of memory", three runs of three. --- .../097-task_global_attribute_const_expr.phpt | 17 ++++---- .../098-task_param_doc_comment.phpt | 42 +++++++++++++++---- 2 files changed, 45 insertions(+), 14 deletions(-) diff --git a/tests/thread_pool/097-task_global_attribute_const_expr.phpt b/tests/thread_pool/097-task_global_attribute_const_expr.phpt index 943318c..daf6e63 100644 --- a/tests/thread_pool/097-task_global_attribute_const_expr.phpt +++ b/tests/thread_pool/097-task_global_attribute_const_expr.phpt @@ -11,8 +11,6 @@ if (!class_exists('Async\ThreadPool')) die('skip ThreadPool not available'); #[Attribute] class Marker { - public const LABEL = 'const-expr-label'; - public function __construct(public string $label = '') {} } @@ -21,14 +19,19 @@ use function Async\spawn; use function Async\await; // Such an argument is kept as an unevaluated tree until something asks for it, -// and the table holding it lived in the snapshot arena. What this catches is -// the attribute table, the same defect as the test before it; the tree of the -// argument is the part it states rather than catches. +// and the table holding it lived in the snapshot arena. The name the tree holds +// is a constant defined at run time, which the compiler cannot fold away, and +// the bootloader gives the worker the same constant, so what reaches the tree +// is the worker's own value. spawn(function() { - $pool = new ThreadPool(workers: 1, coroutine: true); + $pool = new ThreadPool( + workers: 1, + bootloader: static fn() => define('TP_CONST_EXPR_LABEL', 'const-expr-label'), + coroutine: true, + ); await($pool->submit(static function() { - $GLOBALS['tagged'] = #[Marker(Marker::LABEL . '-suffix')] static function() { return 1; }; + $GLOBALS['tagged'] = #[Marker(TP_CONST_EXPR_LABEL . '-suffix')] static function() { return 1; }; return 'stored'; })); diff --git a/tests/thread_pool/098-task_param_doc_comment.phpt b/tests/thread_pool/098-task_param_doc_comment.phpt index 1a79c54..6bd2639 100644 --- a/tests/thread_pool/098-task_param_doc_comment.phpt +++ b/tests/thread_pool/098-task_param_doc_comment.phpt @@ -12,20 +12,48 @@ use Async\ThreadPool; use function Async\spawn; use function Async\await; -// The doc comment of a parameter is an ordinary string of the submitting -// thread, and the arg_info copy carried the pointer over untouched. The worker -// releases arg_info with the op_array, so it released a string it never owned. +// The doc comment of a parameter is an ordinary refcounted string of the +// submitting thread, and the arg_info copy carried the pointer over untouched, +// so the worker both read and released a string it never owned. +// +// The task comes from an eval'd unit that is dropped right after the submit: +// while the submitting script still holds the string the stale pointer reads +// correctly, and the defect is invisible. spawn(function() { $pool = new ThreadPool(workers: 1, coroutine: true); - var_dump(await($pool->submit(function (/** @param int */ int $x = 7) { return $x; }))); - var_dump(await($pool->submit(function (/** @param int */ int $x = 8) { return $x; }))); + $factory = eval('return static function() { + $GLOBALS["documented"] = static function (/** @param int the counter */ int $x = 7) { return $x; }; + return "stored"; + };'); + + var_dump(await($pool->submit($factory))); + + unset($factory); + gc_collect_cycles(); + + await($pool->submit(static function() { + $junk = []; + for ($i = 0; $i < 30000; $i++) { $junk[] = "filler $i"; } + return count($junk); + })); + + var_dump(await($pool->submit(static function() { + $fn = $GLOBALS['documented'] ?? null; + + if ($fn === null) { + return 'gone'; + } + + return (new ReflectionFunction($fn))->getParameters()[0]->getDocComment(); + }))); $pool->close(); echo "Done\n"; }); + ?> --EXPECT-- -int(7) -int(8) +string(6) "stored" +string(29) "/** @param int the counter */" Done