[Bug 79992] Transient corruption in some applications (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79992

--- Comment #4 from Nick Bowler <nbowler at draconx.ca> ---
Created attachment 101000
  --> https://bugs.freedesktop.org/attachment.cgi?id=101000&action=edit
Full debug log (xz compressed)

Applied on top of latest master.  The behaviour is not changed in any
noticeable way (Tried both patches).

I tried building the driver with --enable-debug=full to get more verbose logs.
Don't know if it's related, but I hit this assertion a couple times (not
consistently):

  X: sna_accel.c:2093: _sna_pixmap_move_to_cpu: Assertion `priv->gpu_damage ==
((void *)0)' failed.

In case it helps, I'm attaching the (absurdly big) log from a non-crashing
test run: I started the server (with patch applied), dragged the GMPC window
off screen and back onscreen, saw corruption like in the screenshot, and
closed the server.

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