Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x79) [0x80c3009]
1: [0xb7f97400]
2: /usr/lib/xorg/modules//libexa.so(exaDoMigration+0x64a) [0xb79102fa]
3: /usr/lib/xorg/modules//libexa.so [0xb790ce9b]
4: /usr/lib/xorg/modules//libexa.so [0xb790e5e2]
5: /usr/X11R6/bin/X [0x8177a94]
6: /usr/X11R6/bin/X [0x815e480]
7: /usr/X11R6/bin/X(miCompositeRects+0x7c) [0x815e5ac]
8: /usr/X11R6/bin/X(CompositeRects+0x6f) [0x815fcbf]
9: /usr/X11R6/bin/X [0x8166865]
10: /usr/X11R6/bin/X [0x8162a55]
11: /usr/X11R6/bin/X(Dispatch+0x34f) [0x808c89f]
12: /usr/X11R6/bin/X(main+0x47d) [0x8071d1d]
13: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7b9e685]
14: /usr/X11R6/bin/X [0x8071101]
Saw signal 11.  Server aborting.