Bug #44582 USED_MEM::left not set in alloc_root for debug builds

Submitted:	30 Apr 2009 18:10	Modified:	13 Feb 2014 18:27
Reporter:	Mark Callaghan	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server	Severity:	S3 (Non-critical)
Version:	5.0,5.1, 6.0	OS:	Any
Assigned to:		CPU Architecture:	Any
Tags:	alloc_root, Contribution, debug

Description:
alloc_root does not set USED_MEM::left for the HAVE_purify code. Also a bit more can be done to support valgrind in this code.

This code is missing from the HAVE_purify code in alloc_root:
next->left= Size-ALIGN_SIZE(sizeof(USED_MEM));

I will submit a patch here with possible changes for valgrind

How to repeat:
read the source

Patch for my_alloc.c and 5.0.37

Attachment: mad (application/octet-stream, text), 2.76 KiB.

Thank you for the report.

Verified as described.

Noted in 5.7.4 changelog.

Code instrumented with Valgrind did not preallocate memory in
alloc_root(), to help find bugs. This behavior is now also enabled if
ASAN (address sanitizer) is used.

(The "used_mem::left" issue was fixed as well.)

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