Bug #93173 Valgrind: misused UNIV_MEM_ALLOC after ut_zalloc_nokey

• Submitted: 13 Nov 2018 13:25
• Modified: 14 Nov 2018 6:38
• Reporter: Przemysław Skibiński (OCA)
• Status: Verified
• Category: MySQL Server: InnoDB storage engine
• Severity: S7 (Test Cases)
• Version: 8.0.13, 5.7.24
• OS: Any
• CPU Architecture: Any
• Tags: valgrind

[13 Nov 2018 13:25] Przemysław Skibiński

Description:
There is wrongly used UNIV_MEM_ALLOC (equals to VALGRIND_MAKE_MEM_UNDEFINED) after memory block was zeroed with ut_zalloc_nokey() in 5.7.24:
https://github.com/mysql/mysql-server/blob/5.7/storage/innobase/include/buf0buf.ic#L773

and 8.0.13:
https://github.com/mysql/mysql-server/blob/8.0/storage/innobase/include/buf0buf.ic#L722

How to repeat:
ut_malloc() was replaced with ut_zalloc() with the following commit:
https://github.com/mysql/mysql-server/commit/7f301a8700cbe36ce65e83419dd8cea7fabc5eca
and UNIV_MEM_ALLOC should also be removed.

Suggested fix:
UNIV_MEM_ALLOC should be removed

[14 Nov 2018 6:38] MySQL Verification Team

Hello Przemysław,

Thank you for the report!

regards,
Umesh