Hi Jason, thanks for filing this bug report and working with us to make
Ubuntu better!
The syscall appears to be "select()", which means that ssh is waiting
for data from the other side of some connection. This could be from the
DNS server or the server you have connected to.
What might be more interesting is the output of the debugging mode of
ssh. However, this may not be suitable for public consumption as it
could contain details about the security of not only your local machine,
but that of the remote machine.
If you are going to post that, you should either edit the file to remove
portions that reveal the hostnames/identities of any of the systems or
users that you're connecting to/with, or you can mark this bug as
private before doing so, but then only subscribed users will be able to
see it, so subscribe 'ubuntu-bugcontrol' too so that you can get trusted
users looking at the bug as well.
To generate the debugging output, simply add
-vvv
To your ssh command line, and you will get a ton of output that looks
something like this:
debug1: Requesting no-more-sessi...@openssh.com
debug1: Entering interactive session.
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
When you post the output, Note the sections that take longer than you
would expect them to (and, if you can, exactly how long).
Marking Incomplete pending Jason's response.
** Changed in: openssh (Ubuntu)
Status: New => Incomplete
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ssh client hang for prolonged connections
https://bugs.launchpad.net/bugs/624898
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