[natty-testing] compiz crashed with SIGSEGV in g_source_unref()

[Stanz]

Binary package hint: compiz

After losing side & top panels [result from 'guest session' switching] & filing bug [Bug #746094 ], I tried reboot to regain unity desktop [if I'm correct that its unity I want?].

I opened terminal [keyboard shortcut], typed 'unity', hit enter and apport window opened for this report.
Copy of terminal output is in attached 'TermOutput' file.

As terminal output progressed, the top & side panel returned & are presently fully functional.

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: wl
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
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1366x768 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
 edid-base64: AP///////wAw5GYCAAAAAAATAQOAIhN4CpRlm5tVliYPUFQAAAABAQEBAQEBAQEBAQEBAQEBEhtWeFAADjAgICQAWMIQAAAZEhtWeFAADjAgICQAWMIQAAAZAAAA/gAxSzBSMoAxNTZXSDIKAAAAAAD//////////wEBCiAgAHA=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes:
 edid-base64:
Date: Wed Mar 30 15:56:33 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus: bcmwl, 5.100.82.38+bdcom, 2.6.38-7-generic, x86_64: installed
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 ATI Technologies Inc M92 LP [Mobility Radeon HD 4300 Series] [1002:9552] (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:02fa]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110329.1)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110329.1)
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: Dell Inc. Inspiron 1546
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=d804fc24-cef3-4cf1-8898-c419b488b44f ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
Renderer: Unknown
SegvAnalysis:
 Segfault happened at: 0x7ffe4f595f45 <g_source_unref+5>: mov 0x20(%rdi),%rsi
 PC (0x7ffe4f595f45) ok
 source "0x20(%rdi)" (0x0000001f) not located in a known VMA region (needed readable region)!
 destination "%rsi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 g_source_unref () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 PrivateScreen::~PrivateScreen() ()
 PrivateScreen::~PrivateScreen() ()
 CompScreen::~CompScreen() ()
 CompScreen::~CompScreen() ()
Title: compiz crashed with SIGSEGV in g_source_unref()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin audio cdrom dialout dip disk fax floppy fuse games gdm gnats irc lpadmin nopasswdlogin operator plugdev sambashare sudo syslog tape video voice www-data
dmi.bios.date: 02/01/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 0V2X0M
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA03:bd02/01/2010:svnDellInc.:pnInspiron1546:pvr:rvnDellInc.:rn0V2X0M:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1546
dmi.sys.vendor: Dell Inc.
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.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

[Stanz (stanz)]

once i exit the terminal or Ctrl+C, I lose panels.

[Stanz (stanz)]

Unity [panels top/side] fail to load at 4th reboot.
I'm trying to use gdb to help out--but I must not be using it correctly.
I'll wait afew days before zsync'ing & reinstalling.

[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 #740897, 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.