| Bug #73760 | TTASFutexMutex doesn't expects but does not request aligned m_lock_word | ||
|---|---|---|---|
| Submitted: | 28 Aug 2014 15:00 | Modified: | 29 Aug 2014 13:14 |
| Reporter: | Mark Callaghan | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | MySQL Server: InnoDB storage engine | Severity: | S3 (Non-critical) |
| Version: | 5.7 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
[28 Aug 2014 18:09]
MySQL Verification Team
Indeed after carefully analyzing the code, I am verifying this bug.
[28 Aug 2014 18:17]
Davi Arnaut
MY_ALIGNED(MY_ALIGNOF(ulint))
[28 Aug 2014 18:51]
Sunny Bains
Davi, Mark, Thanks! Fixed.
[29 Aug 2014 13:14]
Daniel Price
Fixed as of the upcoming 5.7.5 release, and here's the changelog entry: The "TTASFutexMutex", the mutex implementation that uses the Linux futex, failed to request "m_lock_word" alignment. Thank you for the bug report.
Description: In 5.7.4m14 there is this in TTASFutexMutex... /* Check that lock_word is aligned. */ ut_ad(!((ulint) &m_lock_word % sizeof(ulint))); But that alignment is not requested... private: MutexPolicy m_policy; volatile lock_word_t m_lock_word; This would fix it for gcc... volatile new_lock_word_t m_lock_word __attribute__ ((aligned (8))); How to repeat: NA Suggested fix: NA