(gdb) bt
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7f0a189 in __lll_lock_wait () from /lib/libpthread.so.0
#2  0xb7f059f6 in _L_lock_95 () from /lib/libpthread.so.0
#3  0xb7f053da in __pthread_mutex_lock (mutex=0xa7b4bfa8)
    at pthread_mutex_lock.c:86
#4  0xa795ff0a in LOCK_HARDWARE (intel=0x8418500) at intel_context.c:696
#5  0xa794a96d in intel_batchbuffer_flush (batch=0x836a3c8)
    at intel_batchbuffer.c:209
#6  0xa79601ff in LOCK_HARDWARE (intel=0x8418500) at intel_context.c:667
#7  0xa794a96d in intel_batchbuffer_flush (batch=0x836a3c8)
    at intel_batchbuffer.c:209
#8  0xa7960d2d in intelFlush (ctx=0x8418500) at intel_context.c:276
#9  0xa7982386 in _mesa_Flush () at main/context.c:1740
#10 0xb7d84ae3 in __glXDRIenterServer (rendering=1 '\001') at glxdri.c:173
#11 0xb7d4dd73 in __glXenterServer (rendering=168 '¨') at glxext.c:437
#12 0xb7d4e2a3 in __glXDispatch (client=0x83c4ff8) at glxext.c:495
#13 0x0815102e in XaceCatchExtProc (client=0x83c4ff8) at xace.c:294
#14 0x0808cbc3 in Dispatch () at dispatch.c:502
#15 0x08073e9b in main (argc=9, argv=0xbfc4c654, envp=Cannot access memory at address 0x88
) at main.c:454
(gdb)