linux-kernel - Re: Deadlock between bind and splice

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Message-ID: <CACT4Y+bS2w3VUgb3MYe3epx7qbiu7VSNhW2CbXwwRSzmsSH2cw@mail.gmail.com>
Date:	Mon, 23 Nov 2015 09:32:31 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>
Subject: Re: Deadlock between bind and splice

On Tue, Nov 10, 2015 at 3:59 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Tue, Nov 10, 2015 at 02:38:54AM +0000, Al Viro wrote:
>> On Fri, Nov 06, 2015 at 07:42:15AM -0800, Eric Dumazet wrote:
>>
>> > Thank you for this report.
>> >
>> > pipe is part of fs, not net ;)
>>
>> AF_UNIX bind() vs. socketpair() interplay, OTOH...
>
> FWIW, BSD folks unlock the socket for the duration of mknod - mark it as
> "somebody's trying to bind it" to avoid the fun with racing double bind(),
> but that's about it.  Tempting, to be honest...
>
> BTW, why does unix_autobind() do allocation under ->readlock?  The allocation
> will be normally used - that if (u->addr) return; part is just dealing with
> an unlikely race, as far as I can see...


Hello,

This is still happening periodically for me. Is there a proposed fix?
I could test it.
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