syzbot has bisected this bug to:
commit 263e1201a2c324b60b15ecda5de9ebf1e7293e31
Author: Paolo Abeni <pabeni@xxxxxxxxxx>
Date: Thu Apr 30 13:01:51 2020 +0000
mptcp: consolidate synack processing.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12a5254a100000
start commit: 051143e1 Merge tag 'apparmor-pr-2020-05-21' of git://git.k..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=11a5254a100000
console output: https://syzkaller.appspot.com/x/log.txt?x=16a5254a100000
kernel config: https://syzkaller.appspot.com/x/.config?x=b3368ce0cc5f5ace
dashboard link: https://syzkaller.appspot.com/bug?extid=c6bfc3db991edc918432
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13eeacba100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167163e6100000
Reported-by: syzbot+c6bfc3db991edc918432@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 263e1201a2c3 ("mptcp: consolidate synack processing.")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
