[Bug 89388] [all regression]system hang and BUG: unable to handle kernel NULL pointer dereference at 0000000000000084 when kill X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89388

--- Comment #1 from lu hua <huax.lu at intel.com> ---
Created attachment 113905
  --> https://bugs.freedesktop.org/attachment.cgi?id=113905&action=edit
Xorg.0.log

output:
root at x-bdw05:~# pkill X
root at x-bdw05:~# xterm: fatal IO error 11 (Resource temporarily unavailable) or
KillClient on X server ":0"
xinit: connection to X server lost

waiting for X server to shut down ..........
xinit: X server slow to shut down, sending KILL signal

waiting for server to die

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