Date: Thu, 3 Aug 2006 09:24:53 GMT From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: FreeBSD-gnats-submit@FreeBSD.org Subject: threads/101323: fork(2) in threaded programs broken. Message-ID: <200608030924.k739OrJ1016406@critter.freebsd.dk> Resent-Message-ID: <200608031740.k73HeFxg008801@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 101323
>Category: threads
>Synopsis: fork(2) in threaded programs broken.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-threads
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Aug 03 17:40:15 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Poul-Henning Kamp
>Release: FreeBSD 7.0-CURRENT i386
>Organization:
>Environment:
System: FreeBSD critter.freebsd.dk 7.0-CURRENT FreeBSD 7.0-CURRENT #5: Wed Jul 5 22:14:32 UTC 2006 root@critter.freebsd.dk:/critter/obj/critter/src/sys/TP41P i386
>Description:
Forking a threaded process and starting a thread in the
child process does not work.
Tested on -current and releng_6 and both fails with more or
less the same error message:
Fatal error 'mutex is on list' at line 540 in file
/usr/src/lib/libpthread/thread/thr_mutex.c (errno = 0)
>How-To-Repeat:
#include <pthread.h>
#include <stdio.h>
void *
thr_sleeper(void *arg)
{
(void)arg;
while (1) {
printf("%d\n", getpid());
sleep (1);
}
}
int
main(int argc, char **argv)
{
pthread_t t1, t2;
(void)argc;
(void)argv;
pthread_create(&t1, NULL, thr_sleeper, NULL);
if (!fork()) {
pthread_create(&t2, NULL, thr_sleeper, NULL);
while(1)
sleep(1);
}
while(1)
sleep(1);
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200608030924.k739OrJ1016406>