MySQL Bugs: #92040: TSAN: Data race in safe

Bug #92040	TSAN: Data race in safe_mutex implementation
Submitted:	16 Aug 2018 10:45	Modified:	29 Aug 2018 18:15
Reporter:	Jon Olav Hauglid	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: Compiling	Severity:	S3 (Non-critical)
Version:	8.0.14	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
Thread Sanitizer reveals that the safe_mutex_assert_owner() and safe_mutex_assert_not_owner()
functions are not thread safe as they inspect members of the safe_mutex_t struct without
holding the protecting mutex.

This only has consequences for debug builds as safe_mutex is not used for release builds.

How to repeat:
Run pretty much any MTR test on server built with WITH_TSAN.

Posted by developer:
 
Fixed in 8.0.14.

Data races discovered by Thread Sanitizer in Event_queue::lock_data
and the SAFE_MUTEX implementation were fixed.