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"rsync -e ssh" hangs when lots of data is being transferred -- USE_PIPES in OpenSSH is the culprit
- From: Jonathan Kamens <jik at curl dot com>
- To: cygwin-apps at cygwin dot com
- Date: 14 Nov 2001 14:31:26 -0500
- Subject: "rsync -e ssh" hangs when lots of data is being transferred -- USE_PIPES in OpenSSH is the culprit
I have my C: drive mounted as /c and my D: drive mounted as /d. If I
run this command:
rsync -v -a -e ssh localhost:/c/cygwin/ /d/cygwin/
If you don't have a D: drive or some other separate drive you can use
as the target directory for this test (using something underneath /c
is a bad idea, because you run the risk of rsync trying to copy the
directory hierarchy that it's creating), you can do the test remotely
from a separate box, i.e., "rsync -v -a -e ssh "remote-host:/c/cygwin/
/some/local/directory/" -- the failure described below still occurs.
Rsync reliably hangs part of the way through the transfer. When I run
"ps" after ^C'ing the hung rsync, I see:
PID PPID PGID WINPID TTY UID STIME COMMAND
223 1 223 223 0 1000 09:08:06 /usr/bin/bash
261 1 261 261 1 1000 13:09:35 /usr/bin/bash
186 1 186 186 ? 1000 14:11:34 /d/scratch/jik/openssh_cvs-20010517/sshd
O 191 186 186 191 ? 1000 14:12:24 /d/scratch/jik/openssh_cvs-20010517/sshd
O 89 191 89 140 ? 1000 14:12:25 /usr/local/bin/rsync
205 223 205 197 0 1000 14:24:40 /usr/bin/ps
Neither rsync nor sshd responds to kill -TERM -- I need to use "kill
-9" to make them die.
By stepping back through the OpenSSH anonymous CVS repository, I
discovered that the first day on which this problem occurs is May 17.
This is the first day in which Corinna's change to enable USE_PIPES
appears. If I compile sshd.exe from the current OpenSSH anonymous CVS
repository sources with the USE_PIPES line removed from configure.ac,
the problem goes away.
My understanding is that pipes behave somewhat poorly under Cygwin
because pipes behave somewhat poorly under Windows :-). It would seem
that Cygwin pipes don't behave reliably enough for OpenSSH to use
them. I'd suggest removing USE_PIPES from OpenSSH for Cygwin.