Thread 1 (Thread -1211631952 (LWP 17959)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7d30875 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7d32201 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7d29b6e in __assert_fail () from /lib/tls/i686/cmov/libc.so.6
#4  0xa76a1d1f in bm_fake_NotifyContendedLockTake (intel=0x8637d80) at bufmgr_fake.c:1398
#5  0xa76a7bb3 in LOCK_HARDWARE (intel=0x8637d80) at intel_context.c:635
#6  0xa76c1dc1 in brw_try_draw_prims (ctx=0x8637d80, arrays=0x868ac80, prim=0xbfe62d90, nr_prims=1, ib=0x0, min_index=0, max_index=3)
    at brw_draw.c:289
#7  0xa76c2315 in brw_draw_prims (ctx=0x8637d80, arrays=0x868ac80, prim=0xbfe62d90, nr_prims=1, ib=0x0, min_index=0, max_index=3)
    at brw_draw.c:446
#8  0xa77612e9 in vbo_exec_DrawArrays (mode=7, start=0, count=4) at vbo/vbo_exec_array.c:264
#9  0xb7bd8653 in __glXDisp_DrawArrays (pc=0x8b4ccfc "") at ../../../GL/glx/render2.c:248
#10 0xb7bb6625 in DoRender (cl=0x8418a70, pc=0x8b4cccc "h", do_swap=0) at ../../../GL/glx/glxcmds.c:1842
#11 0xb7bb66bc in __glXDisp_Render (cl=0x8418a70, pc=0x8b4ccc4 "\217\001\037") at ../../../GL/glx/glxcmds.c:1856
#12 0xb7bbab2c in __glXDispatch (client=0x83c5400) at ../../../GL/glx/glxext.c:551
#13 0x0815765e in XaceCatchExtProc (client=0x83c5400) at ../../Xext/xace.c:299
#14 0x0808f47a in Dispatch () at ../../dix/dispatch.c:457
#15 0x08076f05 in main (argc=10, argv=0xbfe63404, envp=Cannot access memory at address 0x462f
) at ../../dix/main.c:477
The program is running.  Quit anyway (and detach it)? (y or n) Not confirmed.
238	../../dix/main.c: No such file or directory.
	in ../../dix/main.c
The program is running.  Quit anyway (and detach it)? (y or n) Detaching from program: /usr/bin/Xorg, process 17959