linux-kernel - Re: Deadlock between bind and splice

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Date:	Mon, 23 Nov 2015 10:21:27 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-fsdevel@...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 Mon, Nov 23, 2015, at 09:32, Dmitry Vyukov wrote:
> 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.

No, we currently have no fix for that report. :/
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