compiz crashed with SIGSEGV in ScaleScreen::getWindows()

[Antonio Cepeda Peña]

Unity se cerró luego de utilizar la utilidad ''Unity Tweak Tool'' especificamente al activar la opción ''Despliegue de ventanas''

Sistema actualizado, he debido reiniciar el equipo.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140313-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic i686
ApportVersion: 2.13.3-0ubuntu1
Architecture: i386
CurrentDesktop: Unity
Date: Sun Mar 16 17:58:29 2014
ExecutablePath: /usr/bin/compiz
InstallationDate: Installed on 2014-02-27 (17 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140224)
ProcCmdline: compiz
SegvAnalysis:
 Segfault happened at: 0xb177dc54 <_ZNK11ScaleScreen10getWindowsEv+4>: mov 0x24(%eax),%eax
 PC (0xb177dc54) ok
 source "0x24(%eax)" (0x00000024) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 ScaleScreen::getWindows() const () from /usr/lib/compiz/libscale.so
 unity::UnityScreen::OnInitiateSpread() () from /usr/lib/compiz/libunityshell.so
 sigc::internal::slot_call0<sigc::bound_mem_functor0<void, unity::UnityScreen>, void>::call_it(sigc::internal::slot_rep*) () from /usr/lib/compiz/libunityshell.so
 sigc::internal::signal_emit0<void, sigc::nil>::emit(sigc::internal::signal_impl*) () from /usr/lib/compiz/libunityshell.so
 unity::PluginAdapter::OnScreenGrabbed() () from /usr/lib/compiz/libunityshell.so
Title: compiz crashed with SIGSEGV in ScaleScreen::getWindows()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 ScaleScreen::getWindows (this=0x0) at /build/buildd/compiz-0.9.11+14.04.20140310/plugins/scale/src/scale.cpp:676
 unity::UnityScreen::OnInitiateSpread (this=0xa2c5600) at /build/buildd/unity-7.1.2+14.04.20140313/plugins/unityshell/src/unityshell.cpp:532
 operator() (this=0xaa39864) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
 operator() (this=0xaa39860) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
 sigc::internal::slot_call0<sigc::bound_mem_functor0<void, unity::UnityScreen>, void>::call_it (rep=0xaa39848) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103

[Launchpad Janitor (janitor)]

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

[Hendrik Schrieber (hennekn)]

I encounter this problem on my desktop pc that has just been freshly installed with Ubuntu 14.04 on a regular basis. No changes or tweaks to Unity. The problem started right after install. I have two laptops running Ubuntu with Unity not having this problem.

The crash is triggered when you open multiple windows of the same application and click on the application icon in the launcher bar. The first time I do this compiz can recover itself and I get a Apport notification. If I accidentally trigger the bug a second time it completely crashes, does not recover and launcher, window borders as well as menubar are gone.

Using Alt+Tab to switch the window works without problems.

[ashjas (ashjas)]

#7 behaviour is exactly that i have been facing since last two versions of ubuntu.
I had hoped that LTS would be stable and would fix this very very annoying bug.
But no this didnt happen.
Happened for Ubuntu 14.04.1
and now with Ubuntu 14.10 aswell. NO change at all.