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SubjectRe: rcu_sched stalls on 4.14
Hi Paul,

On Sat, Feb 29, 2020 at 8:22 PM Paul E. McKenney <> wrote:

> In the above stack trace, the stalled CPU (that is, CPU 0) is in the idle
> loop, correct? Then it took an interrupt and was processing softirqs
> upon return from that interrupt when it took a scheduling clock interrupt,
> which did the self-reported stall warning.
> Is this analysis correct?

Yes, I think so.

> If so, and assuming that this is reproducible, I suggest building your
> kernel with CONFIG_RCU_EQS_DEBUG=y, which enables additional debugging
> that might be helpful with this issue.

Will ask the reporter to try it. I haven't been able to reproduce it myself.


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