Messages in this thread | | | Date | Wed, 6 Jan 2021 10:52:14 +0100 | From | Peter Zijlstra <> | Subject | Re: lockdep splat in v5.11-rc1 involving console_sem and rq locks |
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On Tue, Jan 05, 2021 at 02:01:15PM -0800, Paul E. McKenney wrote: > Hello! > > The RUDE01 rcutorture scenario (and less often, the TASKS01 scenario) > results in occasional lockdep splats on v5.11-rc1 on x86. This failure > is probabalistic, sometimes happening as much as 30% of the time, but > sometimes happening quite a bit less frequently. (And yes, this did > result in a false bisection. Why do you ask?) The problem seems to > happen more frequently shortly after boot, so for fastest reproduction > run lots of 10-minute RUDE01 runs, which did eventually result in a > good bisection. (Yes, I did hammer the last good commit for awhile.) > > The first bad commit is 1cf12e08bc4d ("sched/hotplug: Consolidate task > migration on CPU unplug"). An example splat is shown below. > > Thoughts?
The splat is because you hit a WARN, we're working on that.
https://lkml.kernel.org/r/20201226025117.2770-1-jiangshanlai@gmail.com
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