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[Hendrik Knackstedt <1293242@xxxxxxxxxxxxxxxxxx>]

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.

** Changed in: unity
       Status: New => Confirmed

** Tags added: amd64

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https://bugs.launchpad.net/bugs/1293242

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

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  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

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