Backtrace:
0: X(xf86SigHandler+0x79) [0x80bc2d9]
1: [0x131400]
2: X(miValidateTree+0x2be) [0x812048e]
3: /usr/lib/xorg/modules/extensions//libdri.so(DRIValidateTree+0x6c) [0x6d830c]
4: X(MapWindow+0x34e) [0x80709fe]
5: X(ProcMapWindow+0x69) [0x8085119]
6: X(Dispatch+0x34f) [0x808599f]
7: X(main+0x47d) [0x806b31d]
8: /lib/libc.so.6(__libc_start_main+0xe6) [0x418606]
9: X(FontFileCompleteXLFD+0x22d) [0x806a701]

Fatal server error:
Caught signal 11.  Server aborting