[Bug 89085] New: General protection fault and desktop freeze while browsing web

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89085

            Bug ID: 89085
           Summary: General protection fault and desktop freeze while
                    browsing web
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: markkulapetteri at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113361
  --> https://bugs.freedesktop.org/attachment.cgi?id=113361&action=edit
/var/log/kern.log of first freeze

I first reported this in kernel bugzilla before realizing that this is better
place.

My Acer c720 chromebook running Ubuntu 14.04 with mainline kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19-vivid/ has had desktop
freezes about once per day after kernel upgrade.

First freeze happened couple hours after upgrade (yesterday). Laptop didn't
react to keyboard or mouse anymore. I didn't try to take remote connection that
time. Power off/on fixed problem and I had no more freezes during that day. I
noticed in the evening that kern.log had trace in it.

Second freeze happened today again while browsing. This time I tried to take
remote connection and succeeded. dmesg output just after the crash is as
attachment. I tried to restart lightdm, but it got stuck after it said that it
had stopped service. I killed it with ctrl-c and rebooted laptop succesfully.

3.18.[5,6] have worked fine for me.

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