linux-kernel - Re: [syzbot] [can?] possible deadlock in j1939_session

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Date: Thu, 14 Mar 2024 22:08:04 -0700
From: syzbot <syzbot+f32cbede7fd867ce0d56@...kaller.appspotmail.com>
To: astrajoan@...oo.com, davem@...emloft.net, edumazet@...gle.com, 
	hdanton@...a.com, kernel@...gutronix.de, kuba@...nel.org, 
	linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux@...pel-privat.de, mkl@...gutronix.de, netdev@...r.kernel.org, 
	o.rempel@...gutronix.de, pabeni@...hat.com, robin@...tonic.nl, 
	socketcan@...tkopp.net, syzkaller-bugs@...glegroups.com, wg@...ndegger.com
Subject: Re: [syzbot] [can?] possible deadlock in j1939_session_activate

syzbot suspects this issue was fixed by commit:

commit 6cdedc18ba7b9dacc36466e27e3267d201948c8d
Author: Ziqi Zhao <astrajoan@...oo.com>
Date:   Fri Jul 21 16:22:26 2023 +0000

    can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10c1afc1180000
start commit:   296455ade1fd Merge tag 'char-misc-6.8-rc1' of git://git.ke..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=8e8eb82c088a8ac6
dashboard link: https://syzkaller.appspot.com/bug?extid=f32cbede7fd867ce0d56
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11d7b3afe80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ba0a4fe80000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock

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