https://bugzilla.kernel.org/show_bug.cgi?id=103561
--- Comment #8 from Christoph Haag haagch.christoph@googlemail.com --- (In reply to Christoph Haag from comment #7)
Created attachment 219231 [details] dmesg with gpufault R600_DEBUG=nodma
I can not confirm it 100%, but I think R600_DEBUG=nodma helps.
False alarm, I just got
[304813.478253] BUG: unable to handle kernel paging request at ffff8001c4069120 [304813.480452] IP: [<ffffffffa05be0df>] ttm_bo_del_from_lru+0x7f/0xa0 [ttm]
with R600_DEBUG=nodma.