hang on exit bug under Linux

[mouring at etoh.eviladmin.org]

[..]
> Like I said, ssh-1.2.27 works fine
> OpenSSH_2.9.9p2 is guaranteed to hang
>
ssh 1.2.27 could/would lose data on scp because is favored quiting before
the buffers were flushed.

> This means that a daemon can never be stopped and restarted from the
> keyboard without a hang or screwing around with special exit
> procedures. Looks, sounds, smells like a bug to me.
>

This pretty much is very unhelpful.  If you read the whole history on this
mailinglist a more USEFUL insight would be why it occurs on some UNIXes
and not others.  And what the correct solution is.

Something no one has been able to do, and I'm at a loss without approving
a hack that may bite us in the ass later on.

- Ben