ARTEMIS-6179 Fix deleteReference/depage deadlock - #6607
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Removes synchronized from QueueImpl#deleteReference(). It calls iterQueue(), which acquires depageLock internally, while depage() acquires depageLock first and then enters a synchronized(this) block. The reversed lock order deadlocks QueueControl#removeMessage() against the paging executor whenever they race on an actively paging queue. This mirrors the fix already applied to copyReference() in ARTEMIS-5376: iterQueue() already provides its own synchronization via depageLock, so the outer synchronized on deleteReference() is redundant and unsafe. Verified with testRemoveMessageWhilstPagingAndConsuming, which reliably deadlocks without this change and passes cleanly with it.
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Removes synchronized from QueueImpl#deleteReference(). It calls iterQueue(), which acquires depageLock internally, while depage() acquires depageLock first and then enters a synchronized(this) block. The reversed lock order deadlocks QueueControl#removeMessage() against the paging executor whenever they race on an actively paging queue.
This mirrors the fix already applied to copyReference() in ARTEMIS-5376: iterQueue() already provides its own synchronization via depageLock, so the outer synchronized on deleteReference() is redundant and unsafe. Verified with
testRemoveMessageWhilstPagingAndConsuming, which reliably deadlocks without this change and passes cleanly with it.