unity-2d-panel crashed with SIGABRT in QList()

[Guillaume Romagny]

pb happened just after a mass update and reboot on March 3rd 2012

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-2d-panel 5.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
ApportVersion: 1.94-0ubuntu1
Architecture: amd64
Date: Sat Mar 3 05:16:04 2012
ExecutablePath: /usr/bin/unity-2d-panel
ProcCmdline: unity-2d-panel
Signal: 6
SourcePackage: unity-2d
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 XGetWindowProperty () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 ?? () from /usr/lib/libwnck-3.so.0
Title: unity-2d-panel crashed with SIGABRT in _XReply()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 unity-2d-panel: [FATAL] Gdk: The program 'unity-2d-panel' received an X Window System error.
 The error was 'BadPixmap (invalid Pixmap parameter)'.
   (Details: serial 687 error_code 4 request_code 54 minor_code 0)
 gnome-session[2386]: WARNING: Application 'unity-2d-panel.desktop' killed by signal

[Apport retracing service (apport)]

StacktraceTop:
 QList (this=0x7fffb5081c50, l=...) at /usr/include/qt4/QtCore/qlist.h:122
 QForeachContainer (t=..., this=0x7fffb5081c50) at /usr/include/qt4/QtCore/qglobal.h:2340
 HotkeyMonitor::getHotkeyFor (this=0x9ac, key=2476, modifiers=Cannot access memory at address 0x6
 ?? ()
 ?? ()

[Gerry Boland (gerboland)]

Can this still be reproduced? I'm unable to do so, nor figure out what could have gone wrong.
-G

[Albert Astals Cid (aacid)]

Reading the stracktrace in
#19 HotkeyMonitor::HotkeyMonitor (this=0x6, parent=<optimized out>) at /build/buildd/unity-2d-5.6.0/libunity-2d-private/src/hotkeymonitor.cpp:41
        opcode = 24
        baseError = 83669797
        baseEvent = 32669
meaning he got
        UQ_WARNING << "Failed to initialize Xkb extension. CapsLock and NumLock"
                      "active will prevent shortcuts from working.";
and for some reason the UQ_WARNING was transformed in a qFatal instead of in a QWarning in
#15 0x00007f9d04971a54 in qFatal (msg=<optimized out>) at global/qglobal.cpp:2505
        ap = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fffb5081f00, reg_save_area = 0x7fffb5081e40}}