NetBSD Problem Report #45627

From martin@duskware.de  Thu Nov 17 21:12:16 2011
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Date: Thu, 17 Nov 2011 21:12:15 +0000 (UTC)
From: martin@NetBSD.org
Reply-To: martin@NetBSD.org
To: gnats-bugs@gnats.NetBSD.org
Subject: unclear memory leaks
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>Number:         45627
>Category:       lib
>Synopsis:       unclear memory leaks
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    lib-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Nov 17 21:15:00 +0000 2011
>Closed-Date:    Fri Nov 18 13:50:41 +0000 2011
>Last-Modified:  Fri Nov 18 13:50:41 +0000 2011
>Originator:     Martin Husemann
>Release:        NetBSD 5.99.56
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD krups.duskware.de 5.99.56 NetBSD 5.99.56 (MP3) #41: Thu Nov 17 20:22:24 CET 2011 martin@night-porter.duskware.de:/usr/src/sys/arch/sparc/compile/MP3 sparc
Architecture: sparc
Machine: sparc
>Description:

The below test program (intended to test for something else originally)
prints random 64bit numbers in an endless loop. It uses no dynamic
allocations once it enters the loop, nevertheless the program increases
its memory size constantly (and pretty fast). On a sparc with typical
memory  configurations it gets killed after an hour or so.

>How-To-Repeat:

cc -O2 -Wall -o t_snprintf t_snprintf.c && ./t_snprintf

with t_snptrinf.c being:
--8<--
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <time.h>

int main(int argc, char **argv)
{
	union {
		double d;
		uint64_t bits;
	} u;
	uint32_t ul, uh;
	time_t now;
	char buf[1000];

	time(&now);
	srand(now);
	for (;;) {
		ul = rand();
		uh = rand();
		u.bits = (uint64_t)uh << 32 | ul;

		printf("\r%08" PRIx64 "  ", u.bits); fflush(stdout);
		snprintf(buf, sizeof buf, " %.2f", u.d);
//		printf("as double: %s\n\n", buf);
	}

	return 0;
}
-->8--

>Fix:
n/a

>Release-Note:

>Audit-Trail:
From: "Christos Zoulas" <christos@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/45627 CVS commit: src/lib/libc/gdtoa
Date: Thu, 17 Nov 2011 21:38:18 -0500

 Module Name:	src
 Committed By:	christos
 Date:		Fri Nov 18 02:38:18 UTC 2011

 Modified Files:
 	src/lib/libc/gdtoa: misc.c

 Log Message:
 PR/45627: Martin Husemann: Plug memory leak


 To generate a diff of this commit:
 cvs rdiff -u -r1.7 -r1.8 src/lib/libc/gdtoa/misc.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

State-Changed-From-To: open->closed
State-Changed-By: martin@NetBSD.org
State-Changed-When: Fri, 18 Nov 2011 13:50:41 +0000
State-Changed-Why:
verified fixed - thanks!


>Unformatted:

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