#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7ef68b9 in ioctl () from /lib/tls/i686/cmov/libc.so.6
#2  0xb51a91fe in drmWaitVBlank () from /usr/lib/libdrm.so.2
#3  0xb4fb5d9c in ?? () from /usr/lib/dri/i915_dri.so
#4  0x00000016 in ?? ()
#5  0xb73d704c in ?? ()
#6  0xb51ae134 in ?? () from /usr/lib/libdrm.so.2
#7  0xb51a8a2b in drmCommandWriteRead () from /usr/lib/libdrm.so.2
#8  0xb4fb5fd3 in driWaitForVBlank () from /usr/lib/dri/i915_dri.so
#9  0xb4fce55a in intelCopyBuffer () from /usr/lib/dri/i915_dri.so
#10 0xb4fcf022 in intelSwapBuffers () from /usr/lib/dri/i915_dri.so
#11 0xb4fb6060 in ?? () from /usr/lib/dri/i915_dri.so
#12 0x094f1e20 in ?? ()
#13 0x00000001 in ?? ()
#14 0x00000000 in ?? ()
(gdb)