Re: Deadlock between bind and splice

From: Al Viro
Date: Mon Nov 09 2015 - 21:59:16 EST

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...
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