https://bugs.freedesktop.org/show_bug.cgi?id=108916
--- Comment #4 from Roman Elshin roman.elshin@gmail.com ---
I can't reproduce this on CIK (Kabini) using provided trace.
So, this sounds like hardware specific bug somewhere, probably llvm.
There are similar distorsions with verde (hd7770 with amdgpu), but it less noticeable there.