Process gnome-panel takes 100% of CPU and GUI doesn't respond

[Jaromir Obr]

Binary package hint: gnome-panel

I had some applications running. Suddenly gnome-panel stopped responding.
I'm not able to click on any icon on gnome-panel. Even Alt+F2 (starting application) doesn't work

ProblemType: Bug
Architecture: amd64
Date: Sun Sep 27 12:59:08 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gnome-panel
NonfreeKernelModules: fglrx
Package: gnome-panel 1:2.28.0-0ubuntu3
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-10.35-generic
SourcePackage: gnome-panel
Uname: Linux 2.6.31-10-generic x86_64

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please try to obtain a backtrace following the instructions at http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace (as an attachment) to the bug report. This will greatly help us in tracking down your problem.

[Jaromir Obr (jaromir-obr)]

It happened again, I'm attaching backtrace of process gnome-panel.

[Jaromir Obr (jaromir-obr)]

Architecture: amd64
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: fglrx
Package: gnome-panel 1:2.28.0-0ubuntu3
PackageArchitecture: amd64
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-10.35-generic
Uname: Linux 2.6.31-10-generic x86_64
UserGroups: adm admin cdrom dialout kqemu kvm libvirtd lpadmin netdev plugdev sambashare vboxusers

[Sebastien Bacher (seb128)]

Could you describe what you do to trigger the bug?

[Jaromir Obr (jaromir-obr)]

Unfortunately I don't know the reliably steps.
I only remember that it happened when I had more running application (more icons with running applications on gnome-panel).
I was working with some of running application and tried to switch to another one using click on gnome-panel. Then bug occurred.

[Jaromir Obr (jaromir-obr)]

Sebastien, now I'm able to reproduce it reliably:
1) Have 3 vertical panels configured as on attached screenshot (it's possible that the bug isn't dependent on position of panels)
2) Run any application 8 times (I tested it with firefox or gnome-terminal). You can start applications using shortcuts from gnome-panel or using Alt+F2
3) Now there are 8 icons on panel with running applications
4) Start the 9th application

Expected result:
Application starts and the 9th icon appears in panel with running applications

Actual result:
Application starts (O.K.), but gnome-panel freezes and no more icons appears in panel with running applications (BUG)

gnome-panel: 1:2.28.0-0ubuntu3

[Sebastien Bacher (seb128)]

the recent comment indicate it's bug #187540