unity-2d-shell crashes when using with a NX server

StacktraceTop:
 Unity2dDebug::unity2dQtHandler (type=QtFatalMsg, message=0x10b81b8 "ASSERT: \"m_barrier != 0\" in file /build/buildd/unity-2d-5.10.0/libunity-2d-private/src/pointerbarrier.cpp, line 188") at /build/buildd/unity-2d-5.10.0/libunity-2d-private/src/unity2ddebug.cpp:89
 qt_message_output (msgType=QtFatalMsg, buf=0x10b81b8 "ASSERT: \"m_barrier != 0\" in file /build/buildd/unity-2d-5.10.0/libunity-2d-private/src/pointerbarrier.cpp, line 188") at global/qglobal.cpp:2203
 qt_message(QtMsgType, const char *, typedef __va_list_tag __va_list_tag *) (msgType=QtFatalMsg, msg=0x7f48823d1ae8 "ASSERT: \"%s\" in file %s, line %d", ap=0x7fffb94f8458) at global/qglobal.cpp:2322
 qFatal (msg=<optimized out>) at global/qglobal.cpp:2505
 PointerBarrierWrapper::setThreshold (this=0xf44bc0, threshold=6500) at /build/buildd/unity-2d-5.10.0/libunity-2d-private/src/pointerbarrier.cpp:230

This happens when logging in with NXwindows.

Status changed to 'Confirmed' because the bug affects multiple users.

Christopher James Halse Rogers suggested using XFixesQueryVersion to check for XFIXES version 6.0

I don't suppose there's a workaround for those of us who are having this problem?

You can wait for 5.12 to be released really soon, alternatively you can change the configuration options of unity-2d not to use sticky edges (you can change this from the control panel but since you probably can get there look for it in dconf-editor com.canonical.unity2d) nor autohiding launcher (you can change this from the control panel but since you probably can get there look for it in dconf-editor com.canonical.unity2d.launcher), that should make pointer barriers not needed and workaround the crash.

Status changed to 'Confirmed' because the bug affects multiple users.

Hello Gendeau, or anyone else affected,

Accepted unity-2d into precise-proposed. The package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

Hi there,

Yes, having the same problem Unity 2D crashes and I'am unable to manage the desktop. Any news on this?

Thanks,

Luis

I am having the same problem. I was running 11.10 via NX. I upgraded to 12.04 and now unity crashes. I installed unity-2d from the precise-proposed archive but when I run /usr/bin/unity-2d-shell, I get unity-2d-shell: [FATAL] ASSERT: "m_barrier != 0" in file /build/buildd/unity-2d-5.10.0/libunity-2d-private/src/pointerbarrier.cpp, line 188
Aborted (core dumped).

Has anyone else had success?

many nx bugs have seemed to be fixed if you install the --proposed version. Personally all my problems have been resolved.

Lois - maybe your problems are due to a different issue (not this bug)?

Michael - afaik you should be running unity from the login screen or gnome-session --session=ubuntu-2d, not by running unity from the command line.

James, the reason I was running the unity-2d-shell from the command line is because the unity bar did not reappear after I installed the --proposed version. I did reboot after install. Where do you specify the gnome-session in the NX login?

see here: http://askubuntu.com/questions/50503/why-do-i-get-unity-instead-of-classic-when-using-nx

Michael, in proposed you should see unity-2d 5.12 not 5.10, if you are using 5.20 it doesn't contain the fix for this

obviously my last 5.20 is 5.10, sorry for the typo

Martin - installing unity-2d-shell from pangolin-proposed fixes the crash for me. Thanks.

This bug was fixed in the package unity-2d - 5.12.0-0ubuntu1

---------------
unity-2d (5.12.0-0ubuntu1) precise-proposed; urgency=low

  * New upstream release:
    - unity-2d-shell crashed with SIGSEGV in ref() (LP: #968046)
    - [hud] First entry always activated with keyboard navigation
      (LP: #980899)
    - unity-2d-shell crashes on autoscrolling on launcher tile removal
      (LP: #988239)
    - unity-2d-shell crashes when using with a NX server (LP: #983942)
    - Dash - update Dash keyboard shortcuts so the 'CTRL + TAB' switches
      between Lenses and 'TAB' by itself moves the focus between categories
      (LP: #891648)
    - [spread] When multiple windows of an app are open, clicking on one
      doesn't bring it to the foreground (LP: #917334)
    - [HUD][multi-monitor] HUD should be expanded to the left if used on a
      screen without launcher (LP: #979927)
    - unity-2d scope un-url-escapes values from its model (LP: #986175)
    - [places] tab key does nothing (LP: #891565)
    - HUD is silent to screen readers (LP: #949445)
    - launcher background coloring does not get reset when using enter to
      activate/start a program (LP: #965079)
    - [multi-monitor] [launcher] Drag & drop application to launcher on
      primary screen, other launchers not updated (LP: #966239)
    - HUD gets activated by Thinkpad USB Keyboard's back and forward buttons
      (LP: #968840)
    - Unity 2D doesn't load 24 bit icons (LP: #977262)
    - Four finger tap does not open the Dash (LP: #978659)
    - No icon in launcher entry, after installing software (LP: #980640)
    - Menu items displayed incorrectly when window streched over multiples
      monitors (LP: #987215)
    - [unity-2d-panel] The close button (potentially the others too) can
      toggled even when they are not visible anymore (LP: #924264)
    - When closing the Dash with the [x] panel button the last windows is not
      focused and doesn't allow to use window controls. (LP: #945459)
    - [launcher] item hint flickers when hovering between launcher edge and
      item (LP: #948383)
    - Missaligned progress bar (LP: #980609)
    - Launcher tile tooltip appears in wrong screen in RTL multimonitor setups
      (LP: #984080)
 -- Didier Roche <email address hidden> Fri, 27 Apr 2012 09:32:40 +0200