Bug 15424

Summary: Infinite loop in paint.c with compiz 0.7.2
Product: xorg Reporter: Sylvain Pasche <sylvain.pasche>
Component: App/compizAssignee: David Reveman <reveman>
Status: RESOLVED WORKSFORME QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: erkinbah
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Sylvain Pasche 2008-04-09 09:10:34 UTC 
I sometimes get Compiz to freeze when doing the following (I also reported it on https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/148073):

1) Open Firefox in fullscreen on one screen
2) Open Totem in fullscreen on the other screen

The the UI is frozen and if I connect to the system with ssh, compiz.real is running at 100% cpu.

I could connect from another machine and look around in gdb. I found an infinite loop in paint.c, function paintOutputRegion()

The loop:

    /* detect occlusions */
    for (w = (*walk.last) (screen); w; w = (*walk.prev) (w))
    {
   ...
     }

... is never escaped. I didn't check if this was fixed in a newer release (I'm using the 0.7.2 version from Ubuntu Hardy). I can provide more information if needed.
Comment 1 Danny Baumann 2008-04-15 04:30:37 UTC 
This seems like an incorrect window walker interface usage to me, thus a plugin bug.
Can you please disable the following plugins, each one at a time, and try if this improves the situation:
- Animation
- Cube
- 3D
Comment 2 Erkin Bahceci 2008-04-21 21:44:48 UTC 
Can you check if this issue persists with the latest compiz fusion plugins-main?
Comment 3 Danny Baumann 2008-09-04 02:31:58 UTC 
No issues at all here in git master.
Please reopen if problem persists.

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