rsync hanging with openssh-2.9.9p2 as the transport

Dave Dykstra dwd at
Wed Jan 15 22:23:01 EST 2003

On Wed, Jan 15, 2003 at 05:12:21PM -0500, Andrew J. Schorr wrote:
> On Wed, Jan 15, 2003 at 09:27:37AM -0600, Dave Dykstra wrote:
> > Unfortunately I don't think anybody is going to be able to tell you.
> > I've not heard of anybody lately posting a similar problem.  In the
> > past hanging problems have been traced to many different sources.
> > Rsync stresses network (and filesystem) implementations greatly, and
> > combining it with ssh stresses things that much more.  I think it's
> > worth a try to use openssh 3.1 or 3.2 (I've not been happy with versions
> > after 3.2).  What's the network between the local and remote machines?
> > Does the name /nfs/mirror imply that the files are not directly mounted
> > on "remote" but are instead on an NFS server?  That has been the cause
> > of many problems in the past.
> Actually, it turns out that my testing on this issue has been invalid
> since I've been using the -vvv flag to rsync to get a grip on where
> it's hanging.  But I just discovered that the -vvv flag itself seems
> to cause rsync to hang.  So all the testing I've done so far is useless,
> so I'm not sure whether this is related to openssh or the slow connection
> or what.  I know that the problem exists in 2.5.5, but I need to do more
> testing without the -vvv flag to figure out what's causing it.  Is it
> well-known that the -vvv flag can cause rsync to hang?

That has been shown to cause hangs in the past, but I thought it was
resolved.  Maybe it hasn't; people don't tend to care so much to solve
problems like that once they discover the workaround of removing the

- Dave

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