Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: WARNING: suspicious RCU usage in idtentry_exit | Date | Thu, 28 May 2020 22:19:02 +0200 |
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Paul,
"Paul E. McKenney" <paulmck@kernel.org> writes: > On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote: >> syzbot <syzbot+3ae5eaae0809ee311e75@syzkaller.appspotmail.com> 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.
https://syzkaller.appspot.com/x/.config?x=47b0740d89299c10
> 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.
:)
Thanks,
tglx
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