(In reply to comment #8) 
> Can you guys bisect?

 So latest good is 37d43ebb28ce8be38f3d9b0805b8b14354ce786d, after
07c65b85eada8dd34019763b6e82ed4257a9b4a6 there is corruption (so i can't tested
this) all the way until 150ac07b855b5c5f879bf6ce9ca421ccd1a6c938 one week later
where is a fix for 3.17 kernel. Took the patch tried
07c65b85eada8dd34019763b6e82ed4257a9b4a6 again an bingo, blah, blah...

 So PIPE_USAGE_STREAM seems to be a main problem again, but unlike 64bit on
32bit it can't be reverted to old behavior, on 32bit it is unusable produce
much corruption.