unity-panel-service crashed with SIGSEGV in g_hash_table_lookup()

[Fabio Marconi]

Hello
Listening a youtube video, I've clicked on the loudspeaker icon on notify area, the menu regularry open, click to move the volume control slide and this works, but when I release the mouse button the volume controll slide still following the mouvement of the mouse, then it stops, but nothing on the screen was responding at the mouse for some seconds, then the system restore itself and the popup of the crash appear.
Now the louspeaker icon don't respond at the click.
I've clicked the mail icon and it works, tried again the loudspeaker icon and now it works...
As far as I can remember, this is not the first time that I see this bug on this machine, but rarely and randomly.
Wow, exacly now I can reproduce again the bug, with apport popup, trying to move the volume slider!!!

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-services 4.2.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0-3.4-generic 3.0.0-rc5
Uname: Linux 3.0-3-generic x86_64
Architecture: amd64
Date: Sun Jul 10 11:23:54 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcEnviron:
 SHELL=/bin/bash
 LANG=it_IT.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7f5cfb5ff6fc <g_hash_table_lookup+12>: push %rbx
 PC (0x7f5cfb5ff6fc) ok
 source "%rbx" ok
 destination "(%rsp)" (0x7fff970fb000) not located in a known VMA region (needed writable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 g_hash_table_lookup () from /lib/x86_64-linux-gnu/libglib-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
 ?? () from /usr/lib/libgtk-3.so.0
Title: unity-panel-service crashed with SIGSEGV in g_hash_table_lookup()
UpgradeStatus: Upgraded to oneiric on 2011-07-10 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Alessandro Losavio (alo21)]

I had the same problem

[Apport retracing service (apport)]

StacktraceTop:
 g_hash_table_lookup (hash_table=0x243fd20, key=0x27c2030) at /build/buildd/glib2.0-2.29.10/./glib/ghash.c:1016
 handler_list_lookup (node=<value optimized out>, detail=0, instance=0x27c2030, emission_return=0x0, instance_and_params=0x416c640) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:406
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x27c2030, emission_return=0x0, instance_and_params=0x416c640) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:3173
 g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=0x7fff970fb2c8) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:2987
 g_signal_emit (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:3044

[Anadon (joshua-r-marshall-1991)]

I think it might be related somehow to this bug:
https://bugs.launchpad.net/ubuntu/+source/nux/+bug/843369

[Anadon (joshua-r-marshall-1991)]

a screen shot of what was happening: