Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x8121c0b]
1: /usr/bin/X(xf86SigHandler+0x8a) [0x80c4762]
2: [0xffffe400]
3: /usr/bin/X(miHandleValidateExposures+0x58) [0x811a89e]
4: /usr/bin/X(UnmapWindow+0x178) [0x8073a78]
5: /usr/bin/X(compFreeClientWindow+0xdc) [0x81324e0]
6: /usr/bin/X [0x812fcca]
7: /usr/bin/X(FreeResource+0xeb) [0x8071619]
8: /usr/bin/X(compUnredirectWindow+0x66) [0x8132203]
9: /usr/bin/X [0x813062b]
10: /usr/bin/X [0x811adb4]
11: /usr/bin/X [0x811acca]
12: /usr/bin/X [0x811acca]
13: /usr/bin/X [0x811acca]
14: /usr/bin/X [0x811acca]
15: /usr/bin/X(miChangeSaveUnder+0x80) [0x811ae5b]
16: /usr/bin/X(MapWindow+0x1bc) [0x8073fe3]
17: /usr/bin/X(ProcMapWindow+0x59) [0x8086bcb]
18: /usr/bin/X(Dispatch+0x30a) [0x80873ea]
19: /usr/bin/X(main+0x5cf) [0x806f102]
20: /lib/libc.so.6(__libc_start_main+0xfa) [0xb7a3574a]

Fatal server error:
Caught signal 11.  Server aborting

(II) PS/2+USB Mouse: Close
(II) UnloadModule: "evdev"
(II) UnloadModule: "synaptics"
(II) AT Translated Set 2 keyboard: Close
(II) UnloadModule: "evdev"