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Date:   Sun, 12 Apr 2020 10:32:01 +0200
From:   Florian Westphal <>
To:     syzbot <>
Subject: Re: WARNING: bad unlock balance in mptcp_listen

syzbot <> wrote:
> syzbot found the following crash on:
> HEAD commit:    5b8b9d0c Merge branch 'akpm' (patches from Andrew)
> git tree:       upstream
> console output:
> kernel config:
> dashboard link:
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> Unfortunately, I don't have any reproducer for this crash yet.
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by:
> =====================================
> WARNING: bad unlock balance detected!
> 5.6.0-syzkaller #0 Not tainted
> -------------------------------------
> syz-executor.0/25417 is trying to release lock (sk_lock-AF_INET6) at:
> [<ffffffff87c65063>] mptcp_listen+0x1c3/0x2e0 net/mptcp/protocol.c:1783
> but there are no more locks to release!

#syz dup: WARNING: bad unlock balance in mptcp_poll

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