netdev - Re: [syzbot] [can?] possible deadlock in j1939_sk

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Message-ID: <000000000000cb9c3d060a28dad8@google.com>
Date: Tue, 14 Nov 2023 19:54:05 -0800
From: syzbot <syzbot+1591462f226d9cbf0564@...kaller.appspotmail.com>
To: arnd@...db.de, astrajoan@...oo.com, bridge@...ts.linux-foundation.org, 
	davem@...emloft.net, dvyukov@...gle.com, edumazet@...gle.com, 
	hdanton@...a.com, ivan.orlov0322@...il.com, kernel@...gutronix.de, 
	kuba@...nel.org, linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux@...pel-privat.de, mkl@...gutronix.de, mudongliangabcd@...il.com, 
	netdev@...r.kernel.org, nikolay@...dia.com, o.rempel@...gutronix.de, 
	pabeni@...hat.com, robin@...tonic.nl, roopa@...dia.com, 
	skhan@...uxfoundation.org, socketcan@...tkopp.net, stephen@...workplumber.org, 
	syzkaller-bugs@...glegroups.com, syzkaller@...glegroups.com
Subject: Re: [syzbot] [can?] possible deadlock in j1939_sk_errqueue (2)

syzbot has bisected this issue to:

commit 2030043e616cab40f510299f09b636285e0a3678
Author: Oleksij Rempel <o.rempel@...gutronix.de>
Date:   Fri May 21 11:57:20 2021 +0000

    can: j1939: fix Use-after-Free, hold skb ref while in use

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1438c947680000
start commit:   1b907d050735 Merge tag '6.7-rc-smb3-client-fixes-part2' of..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1638c947680000
console output: https://syzkaller.appspot.com/x/log.txt?x=1238c947680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=88e7ba51eecd9cd6
dashboard link: https://syzkaller.appspot.com/bug?extid=1591462f226d9cbf0564
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17fea8fb680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1633dc70e80000

Reported-by: syzbot+1591462f226d9cbf0564@...kaller.appspotmail.com
Fixes: 2030043e616c ("can: j1939: fix Use-after-Free, hold skb ref while in use")

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