Re: TCP connection closed without FIN or RST

On Fri, 2017-11-03 at 14:28 -0400, Vitaly Davidovich wrote:

So Eric, while I still have your interest here (although I know it's
waning :)), any code pointers to where I might look to see if a
specific small-ish rcv buf size may interact poorly with the rest of
the stack? Is it possible some buffer was starved in the client stack
which prevented it from sending any segments to the server? Maybe the
incoming retrans were actually dropped somewhere in the ingress pkt
processing and so the stack doesn't know it needs to react to
something? Pulling at straws here but clearly the recv buf size, and a
somewhat small one at that, has some play.

I checked dmesg (just in case something would pop up there) but didn't
observe any warnings or anything interesting.

I believe you could reproduce the issue with packetdrill.

If you can provide a packetdrill file demonstrating the issue, that
would be awesome ;)