docs: document pcov and imagick incompatibilities in known issues#2492
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Pull request overview
Documents two additional extension-related incompatibilities/instability cases to help FrankenPHP users avoid known crash scenarios in threaded/classic mode and choose safer workarounds.
Changes:
- Adds pcov to the “Unsupported PHP extensions” list with a link to the known SIGSEGV/thread-safety issue and a CLI-only coverage workaround.
- Adds imagick to the “Buggy PHP extensions” list with mitigations (limit threads / disable OpenMP).
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dunglas
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Jun 26, 2026
henderkes
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Jun 27, 2026
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pcov is not thread-safe: it swaps the process-global zend_compile_file and zend_execute_ex engine hooks without synchronization, which races across threads and crashes (SIGSEGV) in classic mode (krakjoe/pcov#132). Imagick is unstable because ImageMagick's OpenMP threads conflict with FrankenPHP's threading model.
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henderkes
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pcov is not thread-safe: it swaps the process-global zend_compile_file and zend_execute_ex engine hooks without synchronization, which races across threads and crashes (SIGSEGV) in classic mode (krakjoe/pcov#132). Imagick is unstable because ImageMagick's OpenMP threads conflict with FrankenPHP's threading model.