syzbot has bisected this issue to:
commit 135b8b37bd91cc82f83e98fca109b80375f5317e
Author: Kenny Yu <kennyyu@xxxxxx>
Date: Tue Jun 21 18:04:36 2016 +0000
cgroup: Add pids controller event when fork fails because of pid limit
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12f6d80d900000
start commit: e8878ab8 Merge tag 'spi-fix-v5.9-rc4' of git://git.kernel...
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=11f6d80d900000
console output: https://syzkaller.appspot.com/x/log.txt?x=16f6d80d900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c61610091f4ca8c4
dashboard link: https://syzkaller.appspot.com/bug?extid=65684128cd7c35bc66a1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=121ef0fd900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c3a853900000
Reported-by: syzbot+65684128cd7c35bc66a1@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 135b8b37bd91 ("cgroup: Add pids controller event when fork fails because of pid limit")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
