Re: INFO: rcu detected stall in ip_set_udel

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From: syzbot
Date: Sat Jan 25 2020 - 00:17:08 EST

syzbot has bisected this bug to:

commit 23c42a403a9cfdbad6004a556c927be7dd61a8ee
Author: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
Date: Sat Oct 27 13:07:40 2018 +0000

netfilter: ipset: Introduction of new commands and protocol version 7

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1352c611e00000
start commit: 4703d911 Merge tag 'xarray-5.5' of git://git.infradead.org..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=10d2c611e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1752c611e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=83c00afca9cf5153
dashboard link: https://syzkaller.appspot.com/bug?extid=c27b8d5010f45c666ed1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1568f9c9e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17db3611e00000

Reported-by: syzbot+c27b8d5010f45c666ed1@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 23c42a403a9c ("netfilter: ipset: Introduction of new commands and protocol version 7")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection