https://bugs.freedesktop.org/show_bug.cgi?id=106194

--- Comment #1 from ebiggers3@gmail.com ---
This happened to me too: the same BUG() with the same stacktrace, on 4.17-rc2. 
It was when I was away, so maybe it happened when the screen turned off due to
inactivity.  Graphics card is an Radeon RX 550, one monitor connected via HDMI.
 Didn't happen with 4.16.  I did not test 4.17-rc1.

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