WARNING in drm_modeset_lock_all

[Chris Wilson]

Quoting syzbot (2017-10-27 09:09:50)
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
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Can we use 

Reported-by: syzbot <bot+8de19a03d6fdf256eb2b90ec48916b6f47b9b5a3 at syzkaller.appspotmail.com>

as a unique tag for tracking purposes?
-Chris