Alt+Tab to Firefox causes compiz crashed with SIGSEGV in free()

[Roman Yepishev]

Binary package hint: compiz

Natty Narwhal latest.

unity:
  Installed: 3.6.8-0ubuntu3

compiz:
  Installed: 1:0.9.4git20110322-0ubuntu5

Not sure that this is reproducible but after several switches to Firefox window via Alt+Tab compiz started crashing.
It gets automatically restarted but then may crash again.

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 4.5.2-6ubuntu5)
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: Thu Mar 31 10:47:31 2011
DistUpgraded: Log time: 2010-12-05 18:19:30.064039
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 8400M G] [10de:0428] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0126]
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
InstallationMedia_: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
MachineType: Acer Aspire 5520
ProcCmdline: compiz
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-7-generic root=UUID=799e9cf3-ccb9-48e0-ba0e-22b50bb09faf ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
Renderer: Unknown
SegvAnalysis:
 Segfault happened at: 0x7f3a1a64a2b4: mov 0x8(%rax),%rcx
 PC (0x7f3a1a64a2b4) ok
 source "0x8(%rax)" (0x7f3a0403009008) not located in a known VMA region (needed readable region)!
 destination "%rcx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libc.so.6
 free () from /lib/x86_64-linux-gnu/libc.so.6
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_variant_unref () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: compiz crashed with SIGSEGV in free()
UpgradeStatus: Upgraded to natty on 2010-12-05 (115 days ago)
UserGroups: adm admin audio cdrom dialout libvirtd lpadmin mythtv plugdev sambashare
dmi.bios.date: 05/06/2008
dmi.bios.vendor: Acer
dmi.bios.version: V1.33
dmi.board.name: Fuquene
dmi.board.vendor: Acer
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAcer:bvrV1.33:bd05/06/2008:svnAcer:pnAspire5520:pvrV1.33:rvnAcer:rnFuquene:rvrN/A:cvnAcer:ct10:cvrN/A:
dmi.product.name: Aspire 5520
dmi.product.version: V1.33
dmi.sys.vendor: Acer
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)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #738864, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.