https://bugs.freedesktop.org/show_bug.cgi?id=72785
--- Comment #35 from Luke-Jr luke-jr+freedesktopbugs@utopios.org --- (In reply to Luke-Jr from comment #34)
[ 855.257659] radeon 0000:01:00.0: ring 3 stalled for more than 10000msec [ 855.257670] radeon 0000:01:00.0: GPU lockup (waiting for 0x000000000000963c last fence id 0x000000000000963b on ring 3)
Side note: The keccak kernel gave this same problem - oddly enough, unrolling the for loop going over each round fixed it O.o