Xorg crashed with SIGSEGV in xf86RandR13Pan()

[Kees Cook]

Crash after gdm greeter. Jaunty

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: xserver-xorg-core 2:1.5.99.3-0ubuntu4
ProcCmdline: /usr/X11R6/bin/X :0 -br -audit 0 -auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7
ProcEnviron:
 LANGUAGE=en_US:en_GB:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
ProcVersion: Linux version 2.6.27-1-386 (buildd@vernadsky) (gcc version 4.3.3 20081030 (prerelease) (Ubuntu 4.3.2-2ubuntu1) ) #1 Fri Nov 7 00:29:22 UTC 2008

Signal: 11

[Backtrace]
#0 0x080f64d6 in xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)
    at ../../../../hw/xfree86/modes/xf86RandR12.c:194
 newX = 0
 newY = 0
 width = 0
 height = 0
#1 0x080f6518 in xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)
    at ../../../../hw/xfree86/modes/xf86RandR12.c:212
 newX = 135226560
 newY = 0
 width = 0
 height = 0
... #1 repeats many times ...

[Bryce Harrington (bryce)]

The retracer didn't get anything useful on this... let's wait and see with the new xserver

[Greg Lund-Chaix (gchaix)]

Tried with the latest xserver. Same symptoms. See bug #319026

[Greg Lund-Chaix (gchaix)]

A few interesting things I've noticed while testing this:

1) I *can* select an Mwm or fluxbox session and get a GUI. X does not crash. None of the other available WMs I've tried work - KDE, XFwm, GNOME, Xfce.
2) If I log in using Mwm or fluxbox, open a shell, and run 'xrandr -q' X immediately crashes giving the same info in /var/crash and /var/log/Xorg.0.log
3) I logged in via ssh from another machine. A root shell session sometimes receives the following error message when X crashes: "X11 connection rejected because of wrong authentication."

[Apport retracing service (apport)]

StacktraceTop:xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)
xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)
xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)
xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)
xf86RandR13Pan (crtc=0x81e2ff4, x=136265440, y=0)

[Bryce Harrington (bryce)]

Created an attachment (id=22163)
ThreadStacktrace.txt

Forwarding this bug from a Ubuntu reporter:
https://bugs.edge.launchpad.net/ubuntu/+source/xorg-server/+bug/318045

[Problem]
X segfaults in xf86RandR13Pan() on boot. The trace shows repeated calls to this function.

[Original Report]
A few interesting things I've noticed while testing this:

1) I *can* select an Mwm or fluxbox session and get a GUI. X does not crash. None of the other available WMs I've tried work - KDE, XFwm, GNOME, Xfce.
2) If I log in using Mwm or fluxbox, open a shell, and run 'xrandr -q' X immediately crashes giving the same info in /var/crash and /var/log/Xorg.0.log
3) I logged in via ssh from another machine. A root shell session sometimes receives the following error message when X crashes: "X11 connection rejected because of wrong authentication."

[Bryce Harrington (bryce)]

Created an attachment (id=22164)
XorgLogOld.txt

[Bryce Harrington (bryce)]

Created an attachment (id=22165)
XorgLog.txt

[Bryce Harrington (bryce)]

I've forwarded this bug upstream for you. Could you please subscribe yourself to this bug, in case they need further information or wish you to test something. Thanks ahead of time!

https://bugs.freedesktop.org/show_bug.cgi?id=19696

[Greg Lund-Chaix (gchaix)]

On Thu, Jan 22, 2009 at 10:00 PM, Bryce Harrington
<email address hidden> wrote:
> I've forwarded this bug upstream for you. Could you please subscribe
> yourself to this bug, in case they need further information or wish you
> to test something. Thanks ahead of time!

I'd be delighted! Thanks. :-)

-Greg
--
Greg Lund-Chaix
OSU Open Source Lab
<email address hidden> ~ [phone]

[Greg Lund-Chaix (gchaix)]

Resolved with X.Org 1.5.99.902 (1.6.0 RC 2) on my system.

[Greg Lund-Chaix (gchaix)]

Resolved with X.Org 1.5.99.902 (1.6.0 RC 2). X loads normally now. Huzzah!

[Bryce Harrington (bryce)]

Thanks for following up greg.

[Bryce Harrington (bryce)]

Resolved as per greg's comment on the upstream bug.