compiz crashed with SIGSEGV in g_closure_invoke()

[Dimitree]

Binary package hint: compiz

I had Kaffeine open on my second monitor and Opera on my primary one + gedit.
I needed access to the unity side bar and when i clicked on the unity button it didn't show up.
So i clicked a couple of times and when nothing happened i tried with Alt+Tab a couple of times.
Then the screen went all black and restarted with this bug crash showing.
Kaffeine stopped rendering of the DVB-S channel.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4git20110322-0ubuntu5
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 270.30 Fri Feb 25 14:34:55 PST 2011
 GCC version: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-7ubuntu1)
Architecture: amd64
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
Date: Fri Apr 1 02:58:13 2011
Disassembly: => 0x0: Cannot access memory at address 0x0
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus: nvidia-current, 270.30, 2.6.38-7-generic, x86_64: installed
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
GraphicsCard: nVidia Corporation G86 [GeForce 8500 GT] [10de:0421] (rev a1) (prog-if 00 [VGA controller])
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=0762cb13-6735-43ab-8c3b-0dea3ae6ffcf ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
Renderer: Unknown
SegvAnalysis:
 Segfault happened at: 0x0: Cannot access memory at address 0x0
 PC (0x00000000) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 ?? ()
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: compiz crashed with SIGSEGV in g_closure_invoke()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 02/08/2010
dmi.bios.vendor: Intel Corp.
dmi.bios.version: PRG3110H.86A.0070.2010.0208.1351
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: DG31PR
dmi.board.vendor: Intel Corporation
dmi.board.version: AAD97573-204
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorp.:bvrPRG3110H.86A.0070.2010.0208.1351:bd02/08/2010:svn:pn:pvr:rvnIntelCorporation:rnDG31PR:rvrAAD97573-204:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.4git20110322-0ubuntu5
version.libdrm2: libdrm2 2.4.23-1ubuntu5
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu6

[Apport retracing service (apport)]

StacktraceTop:
 ?? ()
 closure_invoke_notifiers (closure=0x6000000, return_value=0x0, n_param_values=4, param_values=0x7f98b409f640, invocation_hint=0x7fffa5b6c890) at /build/buildd/glib2.0-2.28.5/./gobject/gclosure.c:289
 g_closure_invoke (closure=0x6000000, return_value=0x0, n_param_values=4, param_values=0x7f98b409f640, invocation_hint=0x7fffa5b6c890) at /build/buildd/glib2.0-2.28.5/./gobject/gclosure.c:773
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x250ccf0, emission_return=0x0, instance_and_params=0x7f98b409f640) at /build/buildd/glib2.0-2.28.5/./gobject/gsignal.c:3252
 g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=<value optimized out>) at /build/buildd/glib2.0-2.28.5/./gobject/gsignal.c:2983

[Marnanel Thurman (marnanel)]

What appears to have happened here is that 0x6000000 was treated as a closure, which it wasn't, and the field read from there as the pointer to the code must have been 0x0. The trouble is that we have no way of knowing from this what the closure was *supposed* to be, unless we can reproduce the bug.

Can you, in fact, reproduce this bug?

[jhfhlkjlj (fdsuufijjejejejej-deactivatedaccount)]

Should have expired at this point.