X server randomly crashes (Segmentation fault at address 0x7f18a55c7010)

[Lukas Koranda]

Binary package hint: xorg

Backtrace:
[ 290.788] 0: /usr/bin/X (xorg_backtrace+0x26) [0x4a2626]
[ 290.788] 1: /usr/bin/X (0x400000+0x6219a) [0x46219a]
[ 290.788] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f18a9ede000+0xfc60) [0x7f18a9eedc60]
[ 290.788] 3: /usr/lib/xorg/modules/extensions/librecord.so (0x7f18a7893000+0x2920) [0x7f18a7895920]
[ 290.788] 4: /usr/bin/X (_CallCallbacks+0x34) [0x432af4]
[ 290.788] 5: /usr/bin/X (WriteToClient+0x21a) [0x461c9a]
[ 290.788] 6: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x52) [0x7f18a727ad82]
[ 290.788] 7: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x59) [0x7f18a7279479]
[ 290.788] 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f18a7026000+0x24f90) [0x7f18a704af90]
[ 290.788] 9: /lib/x86_64-linux-gnu/libdrm.so.2 (drmHandleEvent+0x108) [0x7f18a7484478]
[ 290.788] 10: /usr/bin/X (WakeupHandler+0x4b) [0x4322fb]
[ 290.788] 11: /usr/bin/X (WaitForSomething+0x1b6) [0x45c786]
[ 290.788] 12: /usr/bin/X (0x400000+0x2e032) [0x42e032]
[ 290.788] 13: /usr/bin/X (0x400000+0x21a7e) [0x421a7e]
[ 290.788] 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xff) [0x7f18a8e27eff]
[ 290.788] 15: /usr/bin/X (0x400000+0x21629) [0x421629]
[ 290.788] Segmentation fault at address 0x7f18a55c7010
[ 290.788]
Caught signal 11 (Segmentation fault). Server aborting
[ 290.788]
Please consult the The X.Org Foundation support
         at http://wiki.x.org

[Bryce Harrington (bryce)]

Hi Lukas, this backtrace looks more like a GPU lockup (note all the "*Wait*" calls). GPUs are pretty common to Intel graphics.

For these kinds of issues, reproduce the freeze and collect the following:
  * /sys/kernel/debug/dri/0/i915_error_state
  * dmesg
  * File bug as ubuntu-bug xorg