Bug 16867

Summary: KWin (KDE 4.0) triggers segfault in glx
Product: xorg Reporter: Joel Feiner <jafeiner>
Component: Server/DDX/XorgAssignee: Xorg Project Team <xorg-team>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: critical    
Priority: medium    
Version: git   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Joel Feiner 2008-07-27 15:38:55 UTC 
When starting KWin on KDE 4.0 with the latest git Xserver (as of July 27, 6:30 PM, if that helps, but also for at least a day before then), I get the following in GDB:

0xb7e311e3 in DoMakeCurrent (cl=0x8276724, drawId=<value optimized out>, readId=0, contextId=0, tag=1) at glxcmds.c:623
623		if (!glxc->isDirect) {

The backtrace from GDB is

#0  0xb7e311e3 in DoMakeCurrent (cl=0x8276724, drawId=<value optimized out>, readId=0, contextId=0, tag=1) at glxcmds.c:623
#1  0xb7e33a66 in __glXDispatch (client=0x8276658) at glxext.c:512
#2  0x0808c7c4 in Dispatch () at dispatch.c:448
#3  0x08071aba in main (argc=3, argv=0xbfa313c4, envp=0x48981770) at main.c:397

My xorg.conf is attached.  All drivers are open source (video card is Radeon Mobility X300) and my entire X install is from git.
Comment 1 Michel Dänzer 2008-07-28 00:36:43 UTC 
commit ec10eccd56be8b947cd63cae0687b8319857fe60
Author: Michel Dänzer <michel@tungstengraphics.com>
Date:   Mon Jul 28 09:33:04 2008 +0200

    GLX: Unreference drawables bound to the old context, not the new one.

    Apart from the obvious reference counting issue, this fixes
    http://bugs.freedesktop.org/show_bug.cgi?id=16867 .

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