linux-kernel - Re: possible deadlock in neigh_change

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Date:   Sat, 16 Nov 2019 13:58:00 -0800
From:   syzbot <syzbot+6a3c02010a025ac7b7cf@...kaller.appspotmail.com>
To:     christian@...uner.io, corbet@....net, davem@...emloft.net,
        dsahern@...il.com, dvyukov@...gle.com, ebiggers@...nel.org,
        edumazet@...gle.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        roopa@...ulusnetworks.com, syzkaller-bugs@...glegroups.com,
        w.bumiller@...xmox.com
Subject: Re: possible deadlock in neigh_change_state

syzbot has bisected this bug to:

commit 58956317c8de52009d1a38a721474c24aef74fe7
Author: David Ahern <dsahern@...il.com>
Date:   Fri Dec 7 20:24:57 2018 +0000

     neighbor: Improve garbage collection

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1328a1e2e00000
start commit:   addb0679 Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree:       net-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=10a8a1e2e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1728a1e2e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9655b05acfc97ff
dashboard link: https://syzkaller.appspot.com/bug?extid=6a3c02010a025ac7b7cf
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13317705400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=177bb01b400000

Reported-by: syzbot+6a3c02010a025ac7b7cf@...kaller.appspotmail.com
Fixes: 58956317c8de ("neighbor: Improve garbage collection")

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