Paul, "Paul E. McKenney" <paul...@kernel.org> writes: > On Thu, May 28, 2020 at 03:33:44PM +0200, Thomas Gleixner wrote: >> syzbot <syzbot+3ae5eaae0809ee311...@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
