[Bug 88520] New: [snb] Hard lockup + reboot 3.17

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https://bugs.freedesktop.org/show_bug.cgi?id=88520

            Bug ID: 88520
           Summary: [snb] Hard lockup + reboot 3.17
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lionel.g.landwerlin at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Just had a hard lockup on my haswell (Macbook Air 2013).
Probably really hard to reproduce, but I thought I would report it anyway.

Attached is the dmesg, it spans across 24 hours, including around 23 hours of
suspend, you can see a lot backtraces before the suspend and so much after the
wakeup that it's probably what triggered the lockup.
It looks like pretty much all write to registers trigger a backtrace.

I thought it would be interesting for the record, even if nobody can reproduce.

Userspace stack :

libdrm-intel1: 2.4.58
xserver-xorg-video-intel: 2.21.15
libva: 1.4.1
intel-libva-driver: 1.4.1

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