On Wed, Nov 04 2020 at 16:12, Thomas Gleixner wrote: > From: Mike Galbraith <efault@xxxxxx> > > Gratian managed to trigger the BUG_ON(!newowner) in fixup_pi_state_owner(). > This is one possible chain of events leading to this: > > Task Prio Operation > T1 120 lock(F) > T2 120 lock(F) -> blocks (top waiter) > T3 50 (RT) lock(F) -> boosts T3 and blocks (new top waiter) boosts T1 obviously as Sebastian just pointed out to me. /me pulls the futex induced brain damage excuse ...
