RFS (public domain) problems

[paul at phoenix.UUCP]

We have been running the public domain Remote File System
on a pair of uvaxIIs, under Ultrix1.1. This is the program
by Todd Brunhoff. We made the most
recently posted patches to it, the ones that eliminated the
noop() calls, but still are having problems with it.  In 
particular there are times when an attempt to cd to a remote
directory, or ls one will send the user into outer space.
This seems to be an RFS problem since rsh still works fine
at these times, but any attempts to access a remote file will
doom that particular user.   We can't seem to force a 
crash to diagnose the problem, and the only way out seems
to be to reboot.

Has anyone else had any experience with this?