linux-kernel - Re: possible deadlock in inet_stream

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Message-ID: <00000000000099df5f05bba022a8@google.com>
Date:   Thu, 18 Feb 2021 10:02:13 -0800
From:   syzbot <syzbot+b0f5178b61ed7f3bbb46@...kaller.appspotmail.com>
To:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, dsahern@...nel.org,
        fw@...len.de, john.fastabend@...il.com, kafai@...com,
        kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
        mathew.j.martineau@...ux.intel.com, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com,
        yoshfuji@...ux-ipv6.org
Subject: Re: possible deadlock in inet_stream_connect

syzbot has bisected this issue to:

commit 40947e13997a1cba4e875893ca6e5d5e61a0689d
Author: Florian Westphal <fw@...len.de>
Date:   Fri Feb 12 23:59:56 2021 +0000

    mptcp: schedule worker when subflow is closed

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=109b88f2d00000
start commit:   9ec5eea5 lib/parman: Delete newline
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=129b88f2d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=149b88f2d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc1ca9e55dc1f9f
dashboard link: https://syzkaller.appspot.com/bug?extid=b0f5178b61ed7f3bbb46
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=177a6d14d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10caeb02d00000

Reported-by: syzbot+b0f5178b61ed7f3bbb46@...kaller.appspotmail.com
Fixes: 40947e13997a ("mptcp: schedule worker when subflow is closed")

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