SIGSEGV, unity-panel-service crashes and eats a core

Bug #1199696 reported by Fernando Miguel
8
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Unity
Invalid
High
Christopher Townsend
unity (Ubuntu)
Invalid
High
Christopher Townsend

Bug Description

every few minutes unity-panel-service crashes and eats a CPU core.
it has to be killall -9 unity-panel-service and then it restarts fine, till it crashes a few minutes later.
attaching a log of
$ unity --debug | tee unitydebug.log

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc1192700 (LWP 7155)]
0x0000000000d53800 in ?? ()
#0 0x0000000000d53800 in ?? ()
No symbol table info available.
#1 0x00007fffa0008b80 in ?? ()
No symbol table info available.
#2 0x0000000000000000 in ?? ()
No symbol table info available.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity 7.0.2+13.10.20130705.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.10.0-2.10-generic 3.10.0
Uname: Linux 3.10.0-2-generic x86_64
ApportVersion: 2.10.2-0ubuntu4
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,workarounds,grid,vpswitch,snap,imgpng,resize,expo,place,gnomecompat,mousepoll,move,ezoom,unitymtgrabhandles,wall,session,fade,scale,unityshell]
Date: Wed Jul 10 10:16:56 2013
InstallationDate: Installed on 2012-06-10 (394 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120606.2)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
Fernando Miguel (fernandomiguel) wrote :
Stephen M. Webb (bregma)
Changed in unity (Ubuntu):
status: New → Triaged
importance: Undecided → High
Revision history for this message
Christopher Townsend (townsend) wrote :

The stack trace has zero helpful info on where the crash may be occurring and I have not seen this particular issue on my 13.10 machine, so I have no way to reproduce.

I chatted w/ Fernando (original bug reporter) on IRC briefly, and he is willing to help debug if I provide some instructions for him. I'll follow up with this.

Changed in unity (Ubuntu):
assignee: nobody → Christopher Townsend (townsend)
Revision history for this message
Christopher Townsend (townsend) wrote :

Hi Fernando,

I'd like to get debug symbols installed for unity-panel-service, so let's attempt the following:

1. Please make sure Unity (and relevant packages) are updated if they aren't already.
2. Please follow instructions 1, 3, & 4 in https://wiki.ubuntu.com/DebuggingProgramCrash#Debug_Symbol_Packages.
3. Install debug package for the package that contains unity-panel-service: sudo apt-get install unity-services-dbgsym
4. Probably would be best to reboot at this point to make sure system is clean and symbols are found correctly.
5. Reproduce the crash.

Hopefully this will get us the symbols we need in the stack trace. If not, then maybe we need a different debug symbol package, but let's see what happens here first.

Thanks!

Changed in unity:
assignee: nobody → Christopher Townsend (townsend)
importance: Undecided → High
status: New → Triaged
Revision history for this message
Christopher Townsend (townsend) wrote :

This doesn't seem to be occurring anymore with the latest releases, correct?

Changed in unity:
status: Triaged → Incomplete
Changed in unity (Ubuntu):
status: Triaged → Incomplete
Revision history for this message
Will Cooke (willcooke) wrote :

Expired

Changed in unity:
status: Incomplete → Invalid
Changed in unity (Ubuntu):
status: Incomplete → Invalid
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