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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=0x2afd200) at /build/buildd/unity-7.1.2+14.04.20140312/plugins/unityshell/src/unityshell.cpp:532
 sigc::internal::signal_emit0<void, sigc::nil>::emit (impl=0x301bf20) at /usr/include/sigc++-2.0/sigc++/signal.h:776
 emit (this=0x2bc50a8) at /usr/include/sigc++-2.0/sigc++/signal.h:2673
 unity::PluginAdapter::OnScreenGrabbed (this=0x2bc4ee0) at /build/buildd/unity-7.1.2+14.04.20140312/unity-shared/PluginAdapter.cpp:89

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https://bugs.launchpad.net/bugs/1292203

Title:
  compiz crashed with SIGSEGV in ScaleScreen::getWindows()

Status in “unity” package in Ubuntu:
  New

Bug description:
  Hi,

  It has been crashed just while switching between opened windows.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140312-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
  Uname: Linux 3.13.0-16-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: Unity
  Date: Thu Mar 13 21:10:34 2014
  ExecutablePath: /usr/bin/compiz
  InstallationDate: Installed on 2014-03-09 (4 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140304)
  ProcCmdline: compiz
  ProcEnviron:
   LANGUAGE=fr_FR
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f76371d8980 <_ZNK11ScaleScreen10getWindowsEv>:	mov    0x48(%rdi),%rax
   PC (0x7f76371d8980) ok
   source "0x48(%rdi)" (0x00000048) not located in a known VMA region (needed readable region)!
   destination "%rax" 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::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
   unity::UnityScreen::handleEvent(_XEvent*) () 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

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