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[Lem <1284898@xxxxxxxxxxxxxxxxxx>]

This bug is reproducible on the open source Radeon driver with
integrated Radeon HD3200. Stock Ubuntu 14.04 fully updated. The only
manual change was changing the order of plugins to load expo after unity
(so hotcorners would work reliably).

Steps to reproduce:

1. Open several instances of a single application (e.g. terminal)
2. Click on the icon for that application in the unity launcher
3. Compiz segfaults and X crashes.


Here are the segfault entries in dmesg from the few times I did it:

[ 6271.667171] compiz[2431]: segfault at 48 ip 00007f076dfdc840 sp 00007ffcbc8e4228 error 4 in libscale.so[7f076dfcb000+27000]
[ 6423.258754] compiz[4949]: segfault at 48 ip 00007f46c4b5f840 sp 00007ffdec1c53e8 error 4 in libscale.so[7f46c4b4e000+27000]
[ 6440.079751] compiz[5955]: segfault at 48 ip 00007f209a42a840 sp 00007ffe7582a3c8 error 4 in libscale.so[7f209a419000+27000]


uname -a

Linux zinnia 3.16.0-45-generic #60~14.04.1-Ubuntu SMP Fri Jul 24
21:16:23 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

And the output from glxinfo | grep OpenGL:

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RS880
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.3.2
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 10.3.2
OpenGL shading language version string: 1.30

Let me know if any more information is required.

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https://bugs.launchpad.net/bugs/1284898

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

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

Bug description:
  crashed when pressing super + w and trying to select a window

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140220-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-12.32-generic 3.13.4
  Uname: Linux 3.13.0-12-generic x86_64
  ApportVersion: 2.13.2-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Feb 25 18:17:20 2014
  ExecutablePath: /usr/bin/compiz
  InstallationDate: Installed on 2014-02-25 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140223)
  ProcCmdline: compiz
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f1d2b6410c0 <_ZNK11ScaleScreen17getSelectedWindowEv>:	mov    0x48(%rdi),%rax
   PC (0x7f1d2b6410c0) 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::getSelectedWindow() const () from /usr/lib/compiz/libscale.so
   unity::UnityScreen::handleEvent(_XEvent*) () from /usr/lib/compiz/libunityshell.so
   CompScreen::handleEvent(_XEvent*) () from /usr/lib/libcompiz_core.so.ABI-20140123
   PrivateScaleScreen::handleEvent(_XEvent*) () from /usr/lib/compiz/libscale.so
   CompScreen::handleEvent(_XEvent*) () from /usr/lib/libcompiz_core.so.ABI-20140123
  Title: compiz crashed with SIGSEGV in ScaleScreen::getSelectedWindow()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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