Date: Sun, 2 Mar 2003 15:28:33 -0800 (PST) From: Joel Ray Holveck <joelh@piqnet.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/48856: Setting SIGCHLD to SIG_IGN still leaves zombies under threads Message-ID: <200303022328.h22NSXwX040923@thor.piqnet.org>
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>Number: 48856
>Category: bin
>Synopsis: Setting SIGCHLD to SIG_IGN still leaves zombies under threads
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Mar 02 15:30:17 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Joel Ray Holveck
>Release: FreeBSD 5.0-RELEASE i386
>Organization:
>Environment:
System: FreeBSD thor.piqnet.org 5.0-RELEASE FreeBSD 5.0-RELEASE #13: Sun Feb 9 17:11:33 PST 2003 root@thor.piqnet.org:/usr/local/src/freebsd/src/sys/i386/compile/THOR i386
Also a problem under:
FreeBSD sindri.juniper.net 4.5-RELEASE FreeBSD 4.5-RELEASE #1: Sun Jan 26 15:01:15 PST 2003 root@sindri.juniper.net:/usr/src/sys/compile/SINDRI i386
>Description:
Using pthreads under 4.x and 5.0, setting SIGCHLD to SIG_IGN still
leaves zombies. Some programs may create many children and count on
setting SIGCHLD to SIG_IGN to avoid waiting.
>How-To-Repeat:
thor$ cat > foo.c
#include <sys/types.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
int
main()
{
signal (SIGCHLD, SIG_IGN);
if (fork()) {
sleep(1000);
}
exit(0);
}
thor$ gcc foo.c
thor$ ./a.out &
[1] 40860
thor$ ps ax | grep a.out
0 p1 ZW 0:00.00 (a.out)
40860 p1 S 0:00.01 ./a.out
40869 p1 S+ 0:00.01 grep a.out
thor$
>Fix:
I don't see a trivial fix, but it looks like adding the proper code to
uthread_sig.c wouldn't be very hard.
As a workaround, this bug does not exist in kthreads. This isn't much
of a workaround, since a lot more bugs are suspected to be in
kthreads.
>Release-Note:
>Audit-Trail:
>Unformatted:
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