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Date:	Mon, 14 Aug 2006 08:10:57 +0100
From:	Darryl Miles <darryl-mailinglists AT netbauds DOT net>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Rsync over ssh (pulling from Cygwin to Linux) stalls..
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Michael March wrote:
> I am running Cygwin 1.5.21 and rsync version 2.6.6.
> 
> If I run this command from Linux:
> 
> rsync -Lave "ssh -2"
> admin AT xp DOT host DOT com:/cygdrive/g/Backups/rsync/Pictures  /backups/test
> 
> .. the transfers will stall after two files.
> 
> Pushing from XP to Linux does work though..
> 
> Any ideas?

Yes its a known issue for the exact situation you explain.  Pulling 
files from a hosting using ssh+rsync under CYGWIN.

My current understanding of the situation is with the non-blocking 
implementation of pipes under CYGWIN does not return EAGAIN even the 
pipe buffer is full and starts to block.

This causes rsync to become blocked on a write call to send data to ssh, 
and ssh becomes blocked also on a write call sending data to rsync. 
This causes a deadlock.

Since rsync can work in blocking and non-blocking mode its really SSH 
that end that has the problem.

I am actively working on a solution, but at current work rate it maybe a 
few weeks to a month before any preliminary patch will be posted here.

Darryl

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