X crashes, taking me back to gdm

[Stuart Langridge]

Binary package hint: xorg

This has happened a number of times over the last week, but I can't replicate it on demand. It seems to be associated with clicking a link in chromium, although I can't confirm that it's *only* happened in that situation.

Backtrace:
[370186.294] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b]
[370186.294] 1: /usr/bin/X (0x8048000+0x5fac8) [0x80a7ac8]
[370186.294] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb78a240c]
[370186.294] 3: /usr/bin/X (_CallCallbacks+0x3e) [0x8074e1e]
[370186.294] 4: /usr/bin/X (WriteToClient+0x267) [0x80a7607]
[370186.294] 5: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x62) [0xb7450bf2]
[370186.294] 6: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x75) [0xb744efc5]
[370186.294] 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb73d8000+0x226bc) [0xb73fa6bc]
[370186.294] 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb73d8000+0x87d2) [0xb73e07d2]
[370186.294] 9: /lib/i386-linux-gnu/libdrm.so.2 (drmHandleEvent+0xf5) [0xb7429665]
[370186.294] 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb73d8000+0x7937) [0xb73df937]
[370186.294] 11: /usr/bin/X (WakeupHandler+0x52) [0x8074602]
[370186.294] 12: /usr/bin/X (WaitForSomething+0x1ba) [0x80a1f3a]
[370186.294] 13: /usr/bin/X (0x8048000+0x27f1e) [0x806ff1e]
[370186.294] 14: /usr/bin/X (0x8048000+0x1a81c) [0x806281c]
[370186.295] 15: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0xb75a8e37]
[370186.295] 16: /usr/bin/X (0x8048000+0x1a411) [0x8062411]
[370186.295] Segmentation fault at address 0xb497b008

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6+4ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Uname: Linux 2.6.38-8-generic-pae i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
DRM.card0.HDMI.A.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x800
 edid-base64: AP///////wAwZAYjMjQ5NTISAQOAHRJ4Cof1lFdPjCcnUFQAAAABAQEBAQEBAQEBAQEBAQEBKhwAqFAgHjAQMCIAH7QQAAAYAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBSUDc3NKMxMzNFV0REAAAA/gAIDBAUKFB/2AEBCiAgAL4=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
Date: Thu May 26 15:53:11 2011
DistUpgraded: Log time: 2011-01-18 17:25:59.814253
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:0209]
   Subsystem: Dell Device [1028:0209]
MachineType: Dell Inc. XPS M1330
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LC_MESSAGES=en_GB.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: root=UUID=b572742c-deea-43ec-92d3-b1d1e6b6802f ro quiet splash
Renderer: Unknown
SourcePackage: xorg
UpgradeStatus: Upgraded to natty on 2011-01-18 (127 days ago)
dmi.bios.date: 12/26/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0N6705
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd12/26/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn0N6705:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: XPS M1330
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7

[bugbot (bugbot)]

Hi Stuart. Please collect a full backtrace on this crash - see http://wiki.ubuntu.com/X/Backtracing for guidance.

Seems to be crashing in the libdri2 code while trying to write back to the client program. So it sounds like something that may be client-specific. Can you provide some example links you clicked on so we can see if it is reproducible?

[Albert Damen (albrt)]

[370186.294] 3: /usr/bin/X (_CallCallbacks+0x3e) [0x8074e1e]
[370186.294] 4: /usr/bin/X (WriteToClient+0x267) [0x80a7607]
[370186.294] 5: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x62) [0xb7450bf2]
[370186.294] 6: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x75) [0xb744efc5]

This is a duplicate of bug 774978, which has a fix for testing in comment 25.