On Tue, Nov 03 2020 at 17:31, Gratian Crisan wrote: > I apologize for waking up the futex demons (and replying to my own > email), but ... I was staring at it already but couldn't wrap my head around it. > Gratian Crisan writes: > I was able to reproduce the BUG_ON(!newowner) in fixup_pi_state_owner() > with a 5.10.0-rc1-rt1 kernel (currently testing 5.10.0-rc2-rt4). > > I've captured the reproducer, boot messages, OOPS, full event ftrace > dump and some kgdb info here: https://github.com/gratian/traces > > The abbreviated OOPS (w/o the ftrace dump since it's too large to > include inline; see link[1]): Let me start at that then. Thanks, tglx