[Bug 93467] New: [bsw] execlists causes machine lockups

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93467

            Bug ID: 93467
           Summary: [bsw] execlists causes machine lockups
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris at chris-wilson.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

First symptom is:

[  712.910343] clocksource: timekeeping watchdog: Marking clocksource 'tsc' as
unstable because the skew is too large:
[  712.910369] clocksource:                       'refined-jiffies' wd_now:
100019330 wd_last: 1000192b3 mask: ffffffff
[  712.910377] clocksource:                       'tsc' cs_now: 10ffb55119c
cs_last: 10fbba15ba0 mask: ffffffffffffffff
[  712.910523] clocksource: Switched to clocksource refined-jiffies

later followed by a reboot. (Don't have any logs for that yet, if at all
possible.)

The same problem does not occur with i915.enable_execlists=0.

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