Date: Mon, 17 Oct 2011 19:57:50 GMT From: Arnaud Lacombe <lacombar@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/161755: Kernel fails to report negative malloc type statistics Message-ID: <201110171957.p9HJvoRh091465@red.freebsd.org> Resent-Message-ID: <201110172000.p9HK0QHl004957@freefall.freebsd.org>
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>Number: 161755
>Category: kern
>Synopsis: Kernel fails to report negative malloc type statistics
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Oct 17 20:00:26 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Arnaud Lacombe
>Release: 10-current
>Organization:
n/a
>Environment:
>Description:
When malloc-type are uninit, a verification is made to ensure that no memory has been leaked, however, it fails to report if memory allocation have been badly accounted (ie `malloc(X, M_FOO)' followed by `free(Y, M_BAR)').
from `sys/kern/kern_malloc.c':
if (temp_allocs > 0 || temp_bytes > 0) {
printf("Warning: memory type %s leaked memory on destroy "
"(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
this do not report whenever `temp_allocs' or `temp_bytes' are negative, which should be reported, else, whatever is printed can not be trusted.
>How-To-Repeat:
>Fix:
Patch available at:
https://github.com/lacombar/freebsd/commit/8b498200a0389ec48021959e32eaf198c075b6ca
>Release-Note:
>Audit-Trail:
>Unformatted:
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