Re: [PATCH] Reduce the probability to get port collision when asking for secure port. port collision = same port allocated to 2 different clients trying to connect to the same address.

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On Wed, 13 Jan 2016 11:34:25 -0500
"J. Bruce Fields" <bfields@xxxxxxxxxxxx> wrote:

> On Wed, Jan 13, 2016 at 10:59:25AM +0200, Gil Amsalem wrote:
> > Hi,
> > 
> > I don't know how, but I faced this issue where the *bindsocket* method
> > bounded port 1 for two different threads.
> > Not sure how could it happen.
> > After my change, I got random ports of course, and the problem was solved.  
> 
> Huh.  OK, well I'd like to see how to reproduce the problem and
> understand what was going on.  Maybe I'm just missing something obvious
> but I didn't think it should be possible for two bind()s to the same
> port to succeed simultaneously.
> 

It is possible if you set SO_REUSEPORT on the socket. Does pynfs do
that? Might be interesting to strace the program and see if it sets
that option on the socket to confirm...

-- 
Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
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