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 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]