Peter Zijlstra writes: > On Wed, Nov 29, 2017 at 11:56:05AM -0600, Julia Cartwright wrote: > >> fixup_owner() used to have additional seemingly relevant checks in place >> that were removed 73d786bd043eb ("futex: Rework inconsistent >> rt_mutex/futex_q state"). > > *groan*... yes. I completely missed that extra case also applied to > requeue_pi (requeue always did hurt my brain).
FWIW I have been testing for about two days now with the fixup_owner() hunk of 73d786bd043eb ("futex: Rework inconsistent rt_mutex/futex_q state") reverted. So far it hasn't hit the race/deadlock. It normally takes around 8 hours to reproduce. I've also tried Julia's msleep() trick for expanding the race window for the last 4 hours or so of testing and it seems to be still going. Thanks, Gratian