Date: 3 Dec 2002 20:08:24 -0000 From: wright <wright@pair.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: ports/45972: Perl system() calls will hang if the process has other forked children. Message-ID: <20021203200824.22890.qmail@pit24.pair.com>
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>Number: 45972
>Category: ports
>Synopsis: Perl system() calls will hang if the process has other forked children.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-ports
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Dec 03 12:10:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: wright@pair.com
>Release: FreeBSD 4.5-STABLE i386
>Organization:
pair Networks, Inc.
>Environment:
System: FreeBSD pair.com 4.5-STABLE FreeBSD 4.5-STABLE #8: Mon Apr 15 10:23:48 EDT 2002 root@pair.com:/usr/src/sys/compile/PAIRk i386
This bug is known to happen consistently on the following FreeBSD / Perl version combinations:
FreeBSD 4.5-STABLE / Perl 5.8.0 (vfork enabled)
FreeBSD 4.5-STABLE / Perl 5.8.0 (vfork disabled)
FreeBSD 4.6-STABLE / Perl 5.6.0
FreeBSD 4.6-STABLE / Perl 5.6.1
FreeBSD 4.6-STABLE / Perl 5.005_03
The bug does not occur on the following FreeBSD / Perl combination:
FreeBSD 2.2.7-STABLE / Perl 5.005_02
FreeBSD 2.2.7-STABLE / Perl 5.6.1
>Description:
While using Perl in FreeBSD, if the SIG CHLD handler is set to 'IGNORE' and a child process is forked, then all subsequent system() calls made in the parent process will hang until the previously forked child has exited.
>How-To-Repeat:
perl -e '$SIG{CHLD} = "IGNORE"; fork or sleep 0xbeef; system "echo chamber";'
>Fix:
???
>Release-Note:
>Audit-Trail:
>Unformatted:
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