linux-kernel - Re: possible deadlock in dev_mc

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Message-ID: <000000000000d683c505ac98e87e@google.com>
Date:   Tue, 11 Aug 2020 05:07:04 -0700
From:   syzbot <syzbot+08e3d39f3eb8643216be@...kaller.appspotmail.com>
To:     ap420073@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        xiyou.wangcong@...il.com
Subject: Re: possible deadlock in dev_mc_unsync

syzbot suspects this issue was fixed by commit:

commit be74294ffa24f5fbc0d6643842e3e095447e17a2
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Fri Jun 26 18:24:22 2020 +0000

    net: get rid of lockdep_set_class_and_subclass()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=110b0fc2900000
start commit:   4a21185c Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree:       net
kernel config:  https://syzkaller.appspot.com/x/.config?x=bf3aec367b9ab569
dashboard link: https://syzkaller.appspot.com/bug?extid=08e3d39f3eb8643216be
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11d2b1c5100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17aed775100000

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

#syz fix: net: get rid of lockdep_set_class_and_subclass()

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