Backtrace:
0: X(xf86SigHandler+0x79) [0x80ac079]
1: [0xffffe420]
2: /opt/X11R7/lib/xorg/modules/extensions//libglx.so(glxSuspendClients+0x5b) [0xb7e7e90b]
3: /opt/X11R7/lib/xorg/modules/extensions//libglx.so [0xb7eb4bec]
4: X(AbortDDX+0x75) [0x809e7a5]
5: X(AbortServer+0x28) [0x8129a28]
6: X(FatalError+0x66) [0x8129f36]
7: /opt/X11R7/lib/xorg/modules/drivers//intel_drv.so(I830WaitLpRing+0x161) [0xb7e2f381]
8: /opt/X11R7/lib/xorg/modules/drivers//intel_drv.so(I830Sync+0x100) [0xb7e2f5d0]
9: /opt/X11R7/lib/xorg/modules/drivers//intel_drv.so [0xb7e4d41a]
10: /opt/X11R7/lib/xorg/modules//libexa.so(exaWaitSync+0x52) [0xb7cca6c2]
11: /opt/X11R7/lib/xorg/modules//libexa.so [0xb7ccf280]
12: /opt/X11R7/lib/xorg/modules//libexa.so(exaDoMigration+0x3ea) [0xb7ccf7da]
13: /opt/X11R7/lib/xorg/modules//libexa.so(exaPrepareAccessReg+0x60) [0xb7ccb5a0]
14: /opt/X11R7/lib/xorg/modules//libexa.so(exaPrepareAccess+0x2c) [0xb7ccb5ec]
15: /opt/X11R7/lib/xorg/modules//libexa.so(exaPrepareAccessGC+0x59) [0xb7cd2309]
16: /opt/X11R7/lib/xorg/modules//libexa.so [0xb7ccb77f]
17: X [0x816249e]
18: X(ValidateGC+0x25) [0x80927a5]
19: X(miPaintWindow+0x11b) [0x80ff88b]
20: X(miWindowExposures+0xc5) [0x80ffc75]
21: /opt/X11R7/lib/xorg/modules/extensions//libdri.so(DRIWindowExposures+0x89) [0xb7f9bcf9]
22: X(miHandleValidateExposures+0x74) [0x81171b4]
23: X(UnmapWindow+0x1e5) [0x806ff45]
24: X(DeleteWindow+0x27) [0x8073307]
25: X(FreeClientResources+0x8e) [0x806d4ce]
26: X(CloseDownClient+0x1a8) [0x807e7d8]
27: X(Dispatch+0x3f9) [0x8084a09]
28: X(main+0x49a) [0x806bdba]
29: /lib/libc.so.6(__libc_start_main+0xdc) [0x469397e4]
30: X(FontFileCompleteXLFD+0x99) [0x806b0e1