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-jiangshan...@gmail.com
