Uncrossable Mount Points

[rick/1024000]

>From Thor Lancelot Simon <lancelot at spock.uucp>:
> ... To root (UID 0) the file systems behave normally.  To a
> normal user, once one has cd'ed to /usr/local, it is impossible to cd .. -
> impossible to cross the mount point.  'df .' from /usr/local yields
> "Could not find mount point for ."  We export the /usr/local filesystem to
>a number of other machines, and on those machines, the mount point is crossable
> which makes me feel that the problem must lie with the /usr filesystem on the
> server.  Can anybody shed some light on this?  All the filesystems in question

We had a similar problem on an RS/6000 using local mounts. The problem turned
out to be the permissions on the directory before the mount were less than
the permissions after the mount. 
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