possible bug?

[kevin kai-feng chiou]

hi.  i'm running gentoo linux, kernel version 2.4.20.  recently, i chagned
all the login shells from bash to tcsh, and ever since, i haven't been
able to su to other accounts.  i was wondering if this is a bug on this
end or on the other end of the kernel itself

when prompted for a password, i enter one, but i get an error that says
"cannot execute /bin/tcsh; no such file or directory" when in fact, that
file does exist.  in fact, i can run tcsh just fine in command line, and
additionally if the login is thru one of the virtual terminals (the
function keys), it finds the login shells perfectly okay.  additionally,
when i changed my login shells back to bash, su had trouble finding that
as well for some reason.  previously, before i chsh'd my shells there were
no issues with su.

is this a possible bug on your end?  i changed my shells to tcsh using
chsh from the root user.

sorry about the non-technical nature of this email.  i'm a bit new to
this.  let me know if there's anything else you need, or if you believe
the error to be on my end or on another party's.  thanks!

kevin