From owner-freebsd-bugs  Thu Aug 23  4:50:14 2001
Delivered-To: freebsd-bugs@hub.freebsd.org
Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP id D69CD37B408
	for <freebsd-bugs@hub.freebsd.org>; Thu, 23 Aug 2001 04:50:01 -0700 (PDT)
	(envelope-from gnats@FreeBSD.org)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.11.4/8.11.4) id f7NBo1N52570;
	Thu, 23 Aug 2001 04:50:01 -0700 (PDT)
	(envelope-from gnats)
Received: from unix-server.local.gem.pl (gateway.g-em.pl [212.45.233.230])
	by hub.freebsd.org (Postfix) with ESMTP id 1BF2E37B401
	for <FreeBSD-gnats-submit@freebsd.org>; Thu, 23 Aug 2001 04:49:45 -0700 (PDT)
	(envelope-from acid@unix-server.local.gem.pl)
Received: (from acid@localhost)
	by unix-server.local.gem.pl (8.11.5/8.11.5) id f7NBnTu98952;
	Thu, 23 Aug 2001 13:49:29 +0200 (CEST)
	(envelope-from acid)
Message-Id: <200108231149.f7NBnTu98952@unix-server.local.gem.pl>
Date: Thu, 23 Aug 2001 13:49:29 +0200 (CEST)
From: Jakub Kruszona-Zawadzki <acid@gem.pl>
Reply-To: Jakub Kruszona-Zawadzki <acid@gem.pl>
To: FreeBSD-gnats-submit@freebsd.org
X-Send-Pr-Version: 3.113
Subject: misc/29987: error in libc (simultanous call to malloc or free and printf causes Segmentation Fault)
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-bugs.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-bugs>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-bugs>
X-Loop: FreeBSD.org


>Number:         29987
>Category:       misc
>Synopsis:       error in libc (simultanous call to malloc or free and printf causes Segmentation Fault)
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Aug 23 04:50:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Jakub Kruszona-Zawadzki
>Release:        FreeBSD 4.4-PRERELEASE i386
>Organization:
Global eMarketing S.A.
>Environment:

System: FreeBSD unix-server.local.gem.pl 4.4-PRERELEASE FreeBSD 4.4-PRERELEASE #0: Wed Aug 8 11:23:46 CEST 2001 acid@unix-server.local.gem.pl:/usr/obj/usr/src/sys/GEMIUS i386
Machine: Celeron 600

same bug exists on different freebsd versions. We tested FreeBSD 4.1 and FreeBSD 4.3. On both problem exists
(We tested it on Linux too - there is no such problem)

>Description:
	It looks like libc has problems with simultanous calls to some functions
>How-To-Repeat:
	Just compile, and run this code:

/-------------------------------------------------/
#include <signal.h>
#include <stdio.h>

void salarm(int sn) {
	static int s=1;
	alarm(1);
	fprintf(stderr,"Test %09d, %lf\n",s,1/((double)s));	
	s++;
}

int main() {
	char *a;
	int i;
	signal(SIGALRM,salarm);
	alarm(1);
	for (i=0 ; i<1000000 ; i++) {
		a=(char *)malloc(1000000);
		if (a==NULL) printf("NULL !!!\n");
		free(a);
	}
	return 1;
}
/-------------------------------------------------/

>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message