#0  0x00007f3f826644d8 in raise () from /lib/libc.so.6
#1  0x00007f3f82665895 in abort () from /lib/libc.so.6
#2  0x00007f3f8265d8f5 in ?? () from /lib/libc.so.6
#3  0x00007f3f8265d938 in __assert_fail () from /lib/libc.so.6
#4  0x00007f3f808174d8 in kgem_retire (kgem=0xfe9988) at kgem.c:611
#5  0x00007f3f8082378b in sna_accel_wakeup_handler (sna=0xfe9800)
    at sna_accel.c:3455
#6  0x00007f3f8082de26 in sna_wakeup_handler (i=0, data=0xfe9800, result=4, 
    read_mask=0x7d1a60) at sna_driver.c:588
#7  0x00000000004343fc in WakeupHandler (result=4, pReadmask=0x7d1a60)
    at dixutils.c:424
#8  0x0000000000550c14 in WaitForSomething (pClientsReady=0x13c7c70)
    at WaitFor.c:235
#9  0x0000000000430880 in Dispatch () at dispatch.c:368
#10 0x0000000000421334 in main (argc=6, argv=0x7fffbaafa1d8, 
    envp=<optimized out>) at main.c:287