linux-kernel - Re: [syzbot] possible deadlock in release

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Message-ID: <000000000000941ee205f2898d65@google.com>
Date:   Wed, 18 Jan 2023 05:11:23 -0800
From:   syzbot <syzbot+bbd35b345c7cab0d9a08@...kaller.appspotmail.com>
To:     cong.wang@...edance.com, davem@...emloft.net, edumazet@...gle.com,
        eric.dumazet@...il.com, gnault@...hat.com, jakub@...udflare.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] possible deadlock in release_sock

syzbot has bisected this issue to:

commit 0b2c59720e65885a394a017d0cf9cab118914682
Author: Cong Wang <cong.wang@...edance.com>
Date:   Sat Jan 14 03:01:37 2023 +0000

    l2tp: close all race conditions in l2tp_tunnel_register()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15331c61480000
start commit:   87b93b678e95 octeontx2-pf: Avoid use of GFP_KERNEL in atom..
git tree:       net
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17331c61480000
console output: https://syzkaller.appspot.com/x/log.txt?x=13331c61480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2b6ecad960fc703e
dashboard link: https://syzkaller.appspot.com/bug?extid=bbd35b345c7cab0d9a08
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1716b3a1480000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14e57a91480000

Reported-by: syzbot+bbd35b345c7cab0d9a08@...kaller.appspotmail.com
Fixes: 0b2c59720e65 ("l2tp: close all race conditions in l2tp_tunnel_register()")

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