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SubjectRe: WARNING: suspicious RCU usage in idtentry_exit

"Paul E. McKenney" <> writes:
> On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote:
>> syzbot <> writes:
>> Weird. I have no idea how that thing is an EQS here.
> No argument on the "Weird" part! ;-)
> Is this a NO_HZ_FULL=y kernel?

No, it has only NO_HZ_IDLE.

> If so, one possibility is that the call
> to rcu_user_exit() went missing somehow. If not, then RCU should have
> been watching userspace execution.
> Again, the only thing I can think of (should this prove to be
> reproducible) is the rcu_dyntick trace event.




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