Backtrace:
[   748.750] 0: /usr/bin/Xorg (xorg_backtrace+0x2f) [0x462d8f]
[   748.750] 1: /usr/bin/Xorg (0x400000+0x67b56) [0x467b56]
[   748.750] 2: /lib64/libpthread.so.0 (0x30d4200000+0xf4f0) [0x30d420f4f0]
[   748.750] 3: /usr/lib64/xorg/modules/extensions/librecord.so (0x7fb9eb8f6000+0x26c3) [0x7fb9eb8f86c3]
[   748.750] 4: /usr/bin/Xorg (_CallCallbacks+0x3c) [0x43820c]
[   748.750] 5: /usr/bin/Xorg (WriteToClient+0x1f5) [0x466315]
[   748.750] 6: /usr/lib64/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x4f) [0x7fb9eb4e7eef]
[   748.750] 7: /usr/lib64/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x52) [0x7fb9eb4e66d2]
[   748.750] 8: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7fb9eb293000+0x25ae4) [0x7fb9eb2b8ae4]
[   748.750] 9: /usr/lib64/libdrm.so.2 (drmHandleEvent+0xa3) [0x30ee807523]
[   748.750] 10: /usr/bin/Xorg (WakeupHandler+0x6b) [0x4379db]
[   748.750] 11: /usr/bin/Xorg (WaitForSomething+0x1a9) [0x460289]
[   748.750] 12: /usr/bin/Xorg (0x400000+0x3379a) [0x43379a]
[   748.750] 13: /usr/bin/Xorg (0x400000+0x22dc5) [0x422dc5]
[   748.750] 14: /lib64/libc.so.6 (__libc_start_main+0xed) [0x30d3e2169d]
[   748.750] 15: /usr/bin/Xorg (0x400000+0x230b1) [0x4230b1]
[   748.751] Segmentation fault at address 0x7fb9e6eba010
[   748.751] 
Fatal server error:
[   748.751] Caught signal 11 (Segmentation fault). Server aborting


$ sudo rpm -qf  /usr/lib64/xorg/modules/extensions/librecord.so 
xorg-x11-server-Xorg-1.11.1-1.fc16.x86_64
$ rpm -qf /lib64/libpthread.so.0
glibc-2.14.90-14.x86_64