Re: Deadlock between bind and splice

From: Dmitry Vyukov
Date: Mon Nov 23 2015 - 03:32:59 EST

On Tue, Nov 10, 2015 at 3:59 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> 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...


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