https://bugs.freedesktop.org/show_bug.cgi?id=102885
--- Comment #4 from Thomas J. Moore darktjm@gmail.com --- I said I wouldn't, but I went ahead and did a git-bisect:
878bd981bf7aac1466ba3278796f200fa329e2af is the first bad commit
If I have an opportunity later today, I may upload the trace file somewhere.