(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0xb6bf2d04 in __sna_create_cursor (sna=0xb6ae8000) at sna_display.c:3112
3112		c->alloc = ALIGN(size, 4096);
(gdb) bt
#0  0xb6bf2d04 in __sna_create_cursor (sna=0xb6ae8000) at sna_display.c:3112
#1  __sna_get_cursor (sna=sna@entry=0xb6ae8000, crtc=crtc@entry=0x98de220)
    at sna_display.c:3209
#2  0xb6bf3d4b in sna_set_cursor_position (scrn=0x98d86a0, x=688, y=761)
    at sna_display.c:3518
#3  0x08103924 in ?? ()
#4  0x0810272a in ?? ()
#5  0x081c9f16 in ?? ()
#6  0x081cad6a in miPointerSetPosition ()
#7  0x0808f840 in ?? ()
#8  0x0808fcc4 in ?? ()
#9  0x08091454 in GetPointerEvents ()
#10 0x0809195a in QueuePointerEvents ()
#11 0x080cadab in xf86PostMotionEventM ()
#12 0xb5bdd91f in ?? () from /usr/lib/xorg/modules/input/evdev_drv.so
#13 0x080ba5e5 in ?? ()
#14 0x080e514b in ?? ()
#15 <signal handler called>
#16 0xb7796424 in __kernel_vsyscall ()
#17 0xb746fc4d in ___newselect_nocancel () from /usr/lib/libc.so.6
#18 0x081dd0b8 in WaitForSomething ()
#19 0x0807900e in ?? ()
#20 0x0807d375 in ?? ()
---Type <return> to continue, or q <return> to quit---
#21 0x0806719e in ?? ()
#22 0xb73a5993 in __libc_start_main () from /usr/lib/libc.so.6
#23 0x080671c4 in _start ()
(gdb)