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Re: TCP hang with 2.2.14 <-> 2.2.15pre5

To: sfr@xxxxxxxxxxxxxxxx (Stephen Rothwell)
Subject: Re: TCP hang with 2.2.14 <-> 2.2.15pre5
From: kuznet@xxxxxxxxxxxxx (Alexey Kuznetosv)
Date: Sun, 26 Mar 2000 19:31:30 +0800 (SGT)
Cc: netdev@xxxxxxxxxxx
In-reply-to: <200003260014.KAA12821@front.linuxcare.com.au> from "Stephen Rothwell" at Mar 26, 2000 05:13:05 AM
Sender: owner-netdev@xxxxxxxxxxx
Hello!

> elm is sending acks with window 0 but owl persists in trying to send
> another segment.
> 
> My understanding of TCP is not wonderful, but this doesn't seem correct.

Yes, it really tries to send out-of-window segment. It is not good and it is
not clear why it occured, dumps are too short. Could you prepare dumps
with sequence numbers covering stalled seqno - 64K?

> I would be happy to be told that this is a bug in 2.2.14 that is already
> fixed.

I do not remember. Let's search.

But! Despite of all this, rsync behaves strangely. Window became zero not 
because
of bug in tcp, but because of bug in rsync. If it forgets to read data,
it is deemed to dead-lock soon or later. 

Alexey



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