Bug#443794: xserver-xorg: server crashes randomly in libGLcore

[Marcus Better <marcus@better.se>]

I finally got a stack trace! (The gdb problem #422007 decided to go away for a 
while.)

Program received signal SIGSEGV, Segmentation fault.
_mesa_update_framebuffer (ctx=0x1ba7230) at framebuffer.c:669
669     framebuffer.c: No such file or directory.
        in framebuffer.c
(gdb) bt
#0  _mesa_update_framebuffer (ctx=0x1ba7230) at framebuffer.c:669
#1  0x00002b67234eff7d in _mesa_update_state_locked (ctx=0x1ba7230)
    at state.c:1152
#2  0x00002b67234f0091 in _mesa_update_state (ctx=0x1ba7230) at state.c:1218
#3  0x00002b67234b4f68 in _mesa_GetIntegerv (pname=34018, params=0xffffffff)
    at get.c:3741
#4  0x00002b6711ab8f0d in __glXDisp_GetIntegerv (cl=0x19adfc0,
    pc=<value optimized out>) at ../../../GL/glx/indirect_dispatch.c:1906
#5  0x00002b6711aaf72c in __glXDispatch (client=0x1ad75f0)
    at ../../../GL/glx/glxext.c:561
#6  0x000000000044e210 in Dispatch () at ../../dix/dispatch.c:502
#7  0x0000000000436a1c in main (argc=8, argv=0x7fff9bae57e8,
    envp=<value optimized out>) at ../../dix/main.c:452

This happened while visiting the site http://www.di.se which probably has some 
Flash ads.

The stack trace in kdm.log looks slightly different from my original report 
though:

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x6a) [0x482daa]
1: /lib/libc.so.6 [0x2b67104a16a0]
2: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_framebuffer+0x14)
 [0x2b67234b4854]
3: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_state_locked+0x66
d) [0x2b67234eff7d]
4: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_state+0x11) 
[0x2b
67234f0091]
5: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_GetIntegerv+0x268) 
[0x2b
67234b4f68]
6: /usr/lib/xorg/modules/extensions//libglx.so [0x2b6711ab8f0d]
7: /usr/lib/xorg/modules/extensions//libglx.so [0x2b6711aaf72c]
8: /usr/bin/X(Dispatch+0x2e0) [0x44e210]
9: /usr/bin/X(main+0x47c) [0x436a1c]
10: /lib/libc.so.6(__libc_start_main+0xf4) [0x2b671048db44]
11: /usr/bin/X(FontFileCompleteXLFD+0x259) [0x435d59]

Fatal server error:
Caught signal 11.  Server aborting