Bug 10809

Summary:	System freeze after pressing ctrl-alt-bs.
Product:	Mesa	Reporter:	Raúl <rasasi78>
Component:	GLX	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	psyke, samuel.thibault
Version:	6.5
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	Xorg log with the backtrace crash. Backtrace of the crash from the core dump. Xorg configuration file

Description Raúl 2007-04-29 04:42:53 UTC

After using Xorg for a while I decide to log out, then I go back to the kdm login screen. If I press ctrl-alt-bs to force a kill of the server the system will freeze.

I'm not sure if that always happens, but most cases it does. I have tried using ctrl-alt-del, alt-sysrq key combinations to reboot at least but I was unsuccessfull so all I could do it power off my machine.

I own a Dell inspirom 510m laptop with a 855GM video card running 2.6.21 and debian unstable right now.

I attach an Xorg log, a backtrace of the core dump and also my xorg configuration.

Comment 1 Raúl 2007-04-29 04:43:37 UTC

Created attachment 9793 [details]
Xorg log with the backtrace crash.

Comment 2 Raúl 2007-04-29 04:44:01 UTC

Created attachment 9794 [details]
Backtrace of the crash from the core dump.

Comment 3 Raúl 2007-04-29 04:44:20 UTC

Created attachment 9795 [details]
Xorg configuration file

Comment 4 Raúl 2007-04-29 04:54:26 UTC

Paying attention to the backtrace I think this is more possibly a Mesa bug. Sorry for the nuissances.

Comment 5 Lann Martin 2007-07-23 10:23:08 UTC

*** Bug 11306 has been marked as a duplicate of this bug. ***

Comment 6 Lann Martin 2007-07-23 10:27:30 UTC

I am getting similar behavior; suspect its related to fixed #10664. This MIGHT be a bug for i810 (but I won't reassign).

Comment 7 Conn 2007-07-26 16:58:06 UTC

Hardware: Dell Inspiron 510m laptop, 512mb RAM
Chipset: 00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)
Software: Ubuntu Gutsy, xserver-xorg-core 2:1.3.0.0.dfsg-6ubuntu2, xserver-xorg-video-intel 2:2.1.0-1ubuntu1, libgl1-mesa-dri 7.0.0-0ubuntu2

I can confirm the same behaviour as Raul, and I too suspect it's a Mesa issue, directly or indirectly. Additionally, there is a way to make this freeze 100% reproducible:

Case a)
1. Start GDM/KDM session without running compiz (or other 3D applications)
2. Restart X by logging out or pressing Ctrl+Alt+Backspace

Case b)
1. Start session and enable compiz.
2. Restart X (with or without stopping compiz beforehand, it doesn't matter)

Results

Using the 2.1.0 (intel) driver:
Case a) will crash approximately 30% of the time, and with each successive X  restart the chances of a crash exponentially rise. Case b) crashes reproducibly 100% of the time.

Using the 1.7.4 (i810) driver:
Neither case causes a crash.

Perhaps this is related to my other bug #11432, in which X crashes 100% reproducibly when pressing the laptop lid switch (and I've isolated the commit that introduced the regression since driver 1.7.4, details are in that bug report).

Comment 8 Samuel Thibault 2007-08-21 06:45:34 UTC

Note: this really a problematic bug for computer rooms where students keep logging in & out...

Comment 9 Lukas Hejtmanek 2007-08-22 15:20:33 UTC

This patch fixes the problem.
http://lists.freedesktop.org/archives/xorg/2007-August/027467.html

Comment 10 Lukas Hejtmanek 2007-08-22 15:21:50 UTC

consider to report the solution to packages maintainers (debian, ubuntu) to get it fixed in the packages.

Comment 11 Samuel Thibault 2007-08-22 16:30:40 UTC

Seems to work fine for me.

Comment 12 Raúl 2007-09-07 18:32:40 UTC

It's also working for me.

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