SFTP hang on exit - 3.1p1

[Schieber, Dustin]

I'm consistently getting a hang on exit when I sftp from a host running
openssh 2.9p1 (hpux or solaris)  to a Solaris host running openssh 3.1p1.
Based on the limited testing I've done I have found this does not happen
when the source and destination are both running 3.1p1.   

# sftp xxx
Connecting to xxx...
sftp> ls
blah blah blah
sftp>exit
HANG

Is this a known bug?  Looks a lot like the ssh hang-on-exit problem related
to open file handles.
-das