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[Sebastien Bacher <seb128@xxxxxxxxxx>]

The issue seems to have started in vivid
https://errors.ubuntu.com/problem/9b2b6ff77e637a4349392f55c448b543c4fd605c

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1425085

Title:
  compiz crashed with SIGSEGV in unity::glib::Source::IsRunning()

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

Bug description:
  In vivid on a system with nvidia prime gfx I got  this error on second
  boot up just after I started the system restore in place.

  ProblemType: Crash
  DistroRelease: Ubuntu 15.04
  Package: unity 7.3.1+15.04.20150219.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
  Uname: Linux 3.18.0-13-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Feb 24 13:53:27 2015
  ExecutablePath: /usr/bin/compiz
  InstallationDate: Installed on 2015-02-24 (0 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150223)
  ProcCmdline: compiz
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f83a1fd53f3 <_ZNK5unity4glib6Source9IsRunningEv+3>:	mov    0x18(%rdi),%rdi
   PC (0x7f83a1fd53f3) ok
   source "0x18(%rdi)" (0x7f02f33d6588) not located in a known VMA region (needed readable region)!
   destination "%rdi" ok
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: unity
  StacktraceTop:
   unity::glib::Source::IsRunning() const () from /usr/lib/libunity-core-6.0.so.9
   unity::XdndStartStopNotifierImp::DndTimeoutSetup() () from /usr/lib/compiz/libunityshell.so
   sigc::internal::signal_emit1<void, unsigned long, sigc::nil>::emit(sigc::internal::signal_impl*, unsigned long const&) () from /usr/lib/compiz/libunityshell.so
   unity::PluginAdapter::Notify(CompWindow*, CompWindowNotify) () from /usr/lib/compiz/libunityshell.so
   unity::UnityWindow::windowNotify(CompWindowNotify) () from /usr/lib/compiz/libunityshell.so
  Title: compiz crashed with SIGSEGV in unity::glib::Source::IsRunning()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare sudo

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