Date: Wed, 13 Jul 2005 11:26:11 +0200 (CEST) From: Marc Olzheim <marcolz@stack.nl> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/83375: Fatal trap 12 cloning a pty Message-ID: <200507130926.j6D9QB6T001062@synth.ilse.net> Resent-Message-ID: <200507130930.j6D9UDUA028984@freefall.freebsd.org>
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>Number: 83375
>Category: kern
>Synopsis: Fatal trap 12 cloning a pty
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jul 13 09:30:13 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Marc Olzheim
>Release: FreeBSD 5.4-STABLE i386 and 6.0-CURRENT i386
>Organization:
ilse media
>Environment:
System: FreeBSD synth.ilse.net 5.4-STABLE FreeBSD 5.4-STABLE #2: Fri Jul 1 17:08:52 CEST 2005 root@rave.ilse.net:/usr/obj/usr/src/sys/SE3INVAR i386
and
FreeBSD office-install1.ilse.net 6.0-CURRENT FreeBSD 6.0-CURRENT #27: Mon Jul 11 13:03:37 CEST 2005 root@office-install1.ilse.net:/usr/obj/usr/src/sys/CRASH i386
Dual Xeon machine, RELENG_5 SMP kernel with INVARIANTS enabled
to avert this crash for some time.
and
Dual Celeron 6.0-CURRENT SMP with practically GENERIC kernel.
Haven't found a non-SMP machine to test on yet.
>Description:
Opening a new tty by for instance screen often goes horribly
wrong. On RELENG_5, it crashes in ptsopen(), on (6-)CURRENT, it
crashes in the devfs cloning and cleanup routines (each time a
different location).
>How-To-Repeat:
Run this:
crashpts.sh:
-----8<----------8<----------8<----------8<-----
#!/bin/sh
count=0
while true
do
screen -d -m -c "${PWD}/.screenrc.crashpts" &
count=$(($count+1))
if [ $(($count%30)) = 0 ]
then
killall screen
sleep 2
killall -9 screen
fi
done
-----8<----------8<----------8<----------8<-----
screenrc.crashpts:
-----8<----------8<----------8<----------8<-----
screen
screen
screen
screen
screen
screen
screen
screen
screen
screen
-----8<----------8<----------8<----------8<-----
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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