(gdb) bt
#0  0xffffe440 in ?? ()
#1  0xbfc501a8 in ?? ()
#2  0x080ea07c in ddxGiveUp (error=EXIT_ERR_ABORT) at xf86Init.c:1088
#3  0x080ea17f in AbortDDX (error=EXIT_ERR_ABORT) at xf86Init.c:1132
#4  0x080c64bf in AbortServer () at log.c:783
#5  0x080c6872 in FatalError (
    f=0x8253964 <error: Cannot access memory at address 0x8253964>)
    at log.c:924
#6  0x080c6fce in OsSigHandler (signo=11, sip=0xbfc5028c, unused=0xbfc5030c)
    at osinit.c:147
#7  0xffffe420 in ?? ()
#8  0x0000000b in ?? ()
#9  0xbfc5028c in ?? ()
#10 0x0808966f in DeactivatePointerGrab (mouse=0x87265c8) at events.c:1610
#11 0x0809245e in DeleteWindowFromAnyEvents (pWin=0x8aef1f8, freeResources=0)
    at events.c:5699
#12 0x080ba8ab in UnrealizeTree (pWin=0x8aef1f8, fromConfigure=0)
    at window.c:2701
#13 0x080bab4a in UnmapWindow (pWin=0x8aef1f8, fromConfigure=0)
    at window.c:2758
#14 0x080759eb in ProcUnmapWindow (client=0x8b0be78) at dispatch.c:833
#15 0x080749d9 in Dispatch () at dispatch.c:432
#16 0x0808212a in dix_main (argc=6, argv=0xbfc50b44, envp=0xbfc50b60)
---Type <return> to continue, or q <return> to quit---
    at main.c:296
#17 0x080d3aee in main (argc=6, argv=0xbfc50b44, envp=0xbfc50b60)
    at stubmain.c:34