compiz crashed with SIGSEGV in PluginClassHandler<UnityWindow, CompWindow, 0>::get()

[zzeroo]

This happens while I switch some windows via ALT + TAB keys

TEST CASE:
1. Open 3 terminal
2. Press ALT+TAB and select the terminal group
3. Press ALT+` to open the group and select a terminal
4. Press ALT+F4

Result:
This crash

Reproduced with
$ apt-cache policy compiz unity
compiz:
  Installed: 1:0.9.6-0ubuntu1
  Candidate: 1:0.9.6-0ubuntu1
  Version table:
 *** 1:0.9.6-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages
        100 /var/lib/dpkg/status
unity:
  Installed: 4.18.0-0ubuntu1
  Candidate: 4.18.0-0ubuntu1
  Version table:
 *** 4.18.0-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ oneiric/main i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity 4.10.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
Architecture: amd64
CrashCounter: 1
Date: Sat Aug 27 08:41:43 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110423)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=de:en_GB:en
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 LC_MESSAGES=de_DE.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f3f151fcdca <_ZN18PluginClassHandlerI11UnityWindow10CompWindowLi0EE3getEPS1_+378>: mov 0x30(%r12),%rax
 PC (0x7f3f151fcdca) ok
 source "0x30(%r12)" (0x00000030) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 PluginClassHandler<UnityWindow, CompWindow, 0>::get(CompWindow*) () from /usr/lib/compiz/libunityshell.so
 UnityScreen::paintDisplay(CompRegion const&, GLMatrix const&, unsigned int) () from /usr/lib/compiz/libunityshell.so
 UnityWindow::glDraw(GLMatrix const&, GLFragment::Attrib&, CompRegion const&, unsigned int) () from /usr/lib/compiz/libunityshell.so
 GLWindow::glDraw(GLMatrix const&, GLFragment::Attrib&, CompRegion const&, unsigned int) () from /usr/lib/compiz/libopengl.so
 GLWindow::glPaint(GLWindowPaintAttrib const&, GLMatrix const&, CompRegion const&, unsigned int) () from /usr/lib/compiz/libopengl.so
Title: compiz crashed with SIGSEGV in PluginClassHandler<UnityWindow, CompWindow, 0>::get()
UpgradeStatus: Upgraded to oneiric on 2011-07-27 (30 days ago)
UserGroups: adm admin cdrom dialout disk lpadmin plugdev sambashare vboxusers

[Apport retracing service (apport)]

StacktraceTop:
 PluginClassHandler<UnityWindow, CompWindow, 0>::get (base=0x0) at /usr/include/compiz/core/pluginclasshandler.h:205
 end (this=0x7fff5b253e30) at /build/buildd/unity-4.10.2/plugins/unityshell/src/unityshell.cpp:2142
 end<std::vector<boost::shared_ptr<unity::ui::LayoutWindow> > > (__cont=...) at /usr/include/c++/4.6/bits/range_access.h:69
 UnityScreen::paintDisplay (this=0x2350380, region=<optimized out>, transform=<optimized out>, mask=<optimized out>) at /build/buildd/unity-4.10.2/plugins/unityshell/src/unityshell.cpp:460
 UnityWindow::glDraw (this=0x42e9820, matrix=..., attrib=..., region=..., mask=65536) at /build/buildd/unity-4.10.2/plugins/unityshell/src/unityshell.cpp:1362

[Anders Feder (afeder)]

Steps to reproduce:
1. Open any window.
2. Press and hold down Alt long enough for the task switcher to render a preview of the active window.
3. While still holding Alt, press F4 so the active window is closed.
4. Compiz crashes.

[Bernd Schlapsi (bernd-sch)]

The crash happened every time I use ALT+F4 to close a window!

[Bernd Schlapsi (bernd-sch)]

Are there any news on this bug? Will there be a patch available soon?
Tommorow should be released the beta realease of Ubuntu Onieric and this version have a few really bad bugs. My system crashes every time after the login and every time I press ALT+F4 to close a window.

Would be nice to see a new version which fixes this bug!

[David Barth (dbarth)]

It's now an old version of unity. Unfortunately, unless there is a clear way to reproduce it, it's improbable that this can be fixed in time for the final release.

[Anders Feder (afeder)]

Most likely it already has been fixed; I can no longer generate it.

[David Barth (dbarth)]

Thanks for testing the new version. I will mark the bug invalid now, but as usual, re-open if it comes back.

[suxenexus (suxenexus06)]

I had the problem just now. Too many windows would make compiz crash

[Tim Penhey (thumper)]

On Mon 26 Sep 2011 12:24:42 NZDT, suxenexus wrote:
> I had the problem just now. Too many windows would make compiz crash

How many is too many?

[Jean-Baptiste Lallement (jibel)]

reopening, it is still an issue with ALT+TAB and closing a windows while the switcher is active. I'll add a test case in the description.

[Launchpad Janitor (janitor)]

This bug was fixed in the package unity - 4.20.0-0ubuntu1

---------------
unity (4.20.0-0ubuntu1) oneiric; urgency=low

  * New upstream release + cherry-pick:
    - compiz crashed with SIGSEGV in PluginClassHandler<UnityWindow,
      CompWindow, 0>::get() (LP: #835259)
    - dash does not scroll down during keyboard navigation (LP: #852506)
    - compiz crashed with SIGSEGV in _XFreeEventCookies() (LP: #851472)
    - compiz crashed with SIGSEGV in g_object_unref() (LP: #847512)
    - compiz crashed with SIGSEGV in nux::WindowCompositor::MouseEventCycle()
      (LP: #831678)
    - compiz and X can disagree on the stacking order (LP: #845719)
    - compiz crashed with SIGSEGV in unity::dash::LensView::OnResultAdded()
      (LP: #855252)
    - CCSM crashes Unity (LP: #861643)
    - compiz crashed with SIGSEGV in PrivateWindow::addWindowStackChanges()
      (LP: #862115)
    - Touch - When dragging a window with a 3 touch, dragging to the top
      should show the maximize gesture preview. (LP: #750316)
    - compiz crashed with SIGABRT in raise() (LP: #750386)
    - Launcher - Spread should not affect the state of window (LP: #764673)
    - [UIFe] Add system setting icon to Launcher (LP: #764744)
    - compiz crashed with SIGABRT in raise() [Merely unchecking the Unity
      plugin is enough to crash Compiz...] (LP: #823386)
    - Launcher - does not hide if revealed from top 24px of the left edge of
      the screen (LP: #835989)
    - Clickable areas of previously active window remains on 'Show Desktop'
      (LP: #836325)
    - Cannot search for some apps in Dash (LP: #837075)
    - Dash - Search box cursor not responding correctly to focus (LP: #839704)
    - Multi-display: Application menu only showing on primary screen
      (LP: #845212)
    - Ellipsized values in size filter (LP: #851359)
    - (oneiric) dash result expansions don't display icons (LP: #854615)
    - run the wrong command if enter is hit before the view is refreshed
      (LP: #856205)
    - Java application windows cut-off/truncated/not displayed properly
      (LP: #857201)
    - compiz crashed with SIGSEGV in sigc::signal_base::impl() (LP: #831769)
    - Minimizing a window should switch focus to the windows underneath it
      (breaks restore) (LP: #859885)
    - Ratings filter allows ratings > 1.0 (LP: #861255)
    - Serious Unity problem stuck in spread when dragging icons back to the
      dash (LP: #862045)
    - Must use hardware keyboard to perform search for applications in Unity
      (LP: #739812)
    - Files lens should also search Downloads (LP: #748915)
    - The dash crosses the monitor boundary when resolution is 1152x864 or
      lesser width (LP: #765338)
    - Dash - dragging a file outside of the Desktop Dash should close the Dash
      (LP: #764641)
    - Text in Dash search text box overflows and doesn't crop with longer
      strings; RtL input starts in wrong place (LP: #834765)
    - Where the average background colour is either very light or dark, adjust
      this value to darken/lighten in order to preserve readability
      (LP: #837993)
    - Dash does not resize when I connect to an external display and mirror
      displays (LP: #83813...