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7553f9eefd
LOCK_THREAD_COUNT When using the performance schema file io instrumentation in MySQL 5.5, a thread would loop forever inside lf_pinbox_put_pins, when disconnecting. It would also hold LOCK_thread_count while doing so, effectively killing the server. The root cause of the loop in lf_pinbox_put_pins() is a leak of LF_PINS, when used with the filename_hash LF_HASH table in the performance schema. This fix contains the following changes: 1) Added the missing call to lf_hash_search_unpin(), to prevent the leak. 2) In mysys/lf_alloc-pin.c, there was some extra debugging code (MY_LF_EXTRA_DEBUG) written to detect precisely this kind of issues, but it was never used. Replaced MY_LF_EXTRA_DEBUG with DBUG_OFF, so that leaks similar to this one can be always detected in regular debug builds. 3) Backported the fix for the following bug, from 5.6 to 5.5: Bug#13417446 - 63339: INCORRECT FILE PATH IN PEFORMANCE_SCHEMA ON WINDOWS |
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