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Re: Rsync over ssh (pulling from Cygwin to Linux) stalls..


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@xp.host.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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