[Bug 90492] New: Xorg unresponsive under heavy system-load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90492

            Bug ID: 90492
           Summary: Xorg unresponsive under heavy system-load
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: alexander.maznev at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115855
  --> https://bugs.freedesktop.org/attachment.cgi?id=115855&action=edit
Xorg logs, vmstat, and dmesg output.

I have had this problem on rare occasions over the last-year, when CPU or
memory resources are in heavy use, but been unable to reproduce it. Recently I
can reproduce it consistently by triggering firefox bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1165624 

On triggering the Firefox bug, Xserver becomes nearly or completely
unresponsive to user input, after which either Xserver fails, or hard-reboot is
required. 

The following is consistently triggered: 

(WW) intel(0): Failed to submit rendering commands, trying again with outputs
disabled.e
(EE) intel(0): Failed to submit rendering commands, disabling acceleration.

Followed either by a segfault or a bus error. 

System info: 

VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor
Graphics Controller [8086:0166] (rev 09)

Linux version 4.0.1-1-ARCH (builduser at tobias) (gcc version 5.1.0 (GCC) ) #1 SMP
PREEMPT Wed Apr 29 12:00:26 CEST 2015

xorg-server 1.17.1-5

xf86-video-intel 2.99.917-5

Xorg logs, vmstat, and dmesg output are attached.

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