WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

[Dave Airlie]

>> > > > > FIX idr_layer_cache: Marking all objects used
>> > > >
>> > > > Yesterday I couldn't reproduce the issue at all. But today I've hit
>> > > > exactly the same spot again. (CCing the drm list)

If I had to guess it looks like 0 is getting written back to some
random page by the GPU maybe, it could be that the GPU is in some half
setup state at boot or on a reboot does it happen from a cold boot or
just warm boot or kexec?

Jerome, might be worth checking the ordering for when bus master gets
enabled or if we turn off the writeback producers before writeback is
enabled.

Dave.