Unity panel crashes when switching tabs in Kile

[Floris Van den Abeele]

When editing multiple documents in Kile, switching tabs inside Kile by left clicking on the tab makes the panel disappear and then reappear (this takes 1 second or so). This is also accompanied by a CPU load spike (whether due to the crash or the restarting of the panel service I cannot say).

Some additional information about the ubuntu/unity/kile I'm running:
lsb_release -rd
Description: Ubuntu 12.04.2 LTS
Release: 12.04

apt-cache policy unity
unity:
  Installed: 5.20.0-0ubuntu2
  Candidate: 5.20.0-0ubuntu2
  Version table:
 *** 5.20.0-0ubuntu2 0
        500 http://be.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     5.10.0-0ubuntu6 0
        500 http://be.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

apt-cache policy kile
kile:
  Installed: 1:2.1.0-1ubuntu2.1
  Candidate: 1:2.1.0-1ubuntu2.1
  Version table:
 *** 1:2.1.0-1ubuntu2.1 0
        500 http://be.archive.ubuntu.com/ubuntu/ precise-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     1:2.1.0-1ubuntu2 0
        500 http://be.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-services 5.20.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-51.77-generic 3.2.48
Uname: Linux 3.2.0-51-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,compiztoolbox,move,resize,place,vpswitch,session,snap,imgpng,mousepoll,grid,gnomecompat,wall,regex,put,unitymtgrabhandles,animation,workarounds,fade,expo,scale,ezoom,unityshell]
CrashCounter: 1
Date: Wed Aug 14 11:23:27 2013
ExecutablePath: /usr/lib/unity/unity-panel-service
ExecutableTimestamp: 1373299899
MarkForUpload: True
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcCwd: /
SegvAnalysis:
 Segfault happened at: 0x4063c5: cmp %rax,(%rdx)
 PC (0x004063c5) ok
 source "%rax" ok
 destination "(%rdx)" (0xffffffffffffffff) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 ?? ()
 ?? () from /usr/lib/x86_64-linux-gnu/gtk-3.0/modules/libatk-bridge.so
 g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: unity-panel-service crashed with SIGSEGV in g_main_context_dispatch()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 panel_indicator_entry_accessible_get_n_children (accessible=<optimized out>) at /build/buildd/unity-5.20.0/services/panel-indicator-entry-accessible.c:256
 append_children (traversal=0x1a35e40, accessible=0x3624dc0) at ../../atk-adaptor/accessible-cache.c:235
 add_pending_items (data=<optimized out>) at ../../atk-adaptor/accessible-cache.c:291
 ?? ()
 ?? ()

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Svenn-Arne Dragly (dragly)]

A workaround that disables the global menubar and enables the menu bar in Kile is to do as follows:

Open ~/.kde/share/config/kilerc and change the following line:

    MenuBar=Disabled

to

    MenuBar=Enabled

After this, launch Kile from Terminal by typing

    QT_X11_NO_NATIVE_MENUBAR=1 kile

This should keep the unity-panel-service from crashing and restarting.

[Floris Van den Abeele (florisvda)]

I can confirm that the workaround from post #7 works (at least for my system). Thanks Svenn!

[Paolo Penna (paolo-penna)]

Unfortunately a side-effect of workaround from post #7 is that the menubar desappears (at least in my case - Ubuntu 12.04). Thanks to Svenn anyway.

[sam (samer-mirror)]

The workaround of #7 works, and in my case the menubar does not disappear as #9 says (Ubuntu 12.04, Kile 2.1.0, KDE 4.8.5).

[sam (samer-mirror)]

Ops, after further testing, the issue of #9 does happen in my system also. It was not happening yesterday though. My apologies.
(Ubuntu 12.04, Kile 2.1.0, KDE 4.8.5).

[Will Cooke (willcooke)]

As part of the big bug clear up for 16.04 LTS I am marking this bug as Wont Fix.
These types of crasher are better handled by errors.ubutnu.com which can collate similar crash reports to help us identify persitent bugs rather than one-off crashes.
Sorry we are not able to help with this specific issue. If you are still experiencing this crash, please re-open the bug and add the tag "desktop-bugscrub-reopened". See https://wiki.ubuntu.com/BigDesktopBugScrub for more information.