https://bugs.freedesktop.org/show_bug.cgi?id=100375
--- Comment #5 from Michel Dänzer michel@daenzer.net --- (In reply to Edward O'Callaghan from comment #4)
The actual root causes is that if a page flip is in progress something races on that fd and causes the null ptr deref:
How did you determine that it's related to a page flip (or amdgpu in the first place)? I don't see the connection between that and set_root.