I've encountered a thoroughly interesting and somewhat perplexing issue
with a user login.

The basic symptom is that the user can't login - and as root I can't
complete an su as that user.

# su - username
(hangs)
^C

/var/log/secure however suggests a successful connection..

Jan 18 12:25:11 machine su: pam_unix(su-l:session): session opened for
user username by root(uid=0)
Jan 18 12:26:01 machine su: pam_unix(su-l:session): session closed for
user username

Now we have a system where the several hundred users in /home are actually
symlinks to NFS attached storage on /data/user[1..2].

Which is the case for this user.

[user2]# ls -lad username/
drwxr-xr-x 46 username groupname 8192 Jan 15 07:53 username/
# pwd
/data/user2

However when running an ls on the login node it shows they have a
directory in home that is *not* a symlink, unlike others.

# ls -lad /home/username
drwxr-xr-x 46 username groupname 8192 Jan 15 07:53 /home/username/
# ls -lad /home/lev
lrwxrwxrwx 1 lev home 15 Apr 15  2014 /home/lev -> /data/user1/lev

*Except* when one does a directory listing from /home itself (where it has
a different groupname)!

[root@edward home]# ls -la /home/
..
lrwxrwxrwx   1 username  home       19 Jul 26  2013 sanujig ->
/data/user2/username

Note that the two directories have the same inode.

# ls -id /home/username/
1081162059 /home/sanujig/

]# ls -id /data/user2/username
1081162059 /data/user2/username

Fascinating, eh?


-- 
Lev Lafayette, BA (Hons), GradCertTerAdEd (Murdoch), GradCertPM, MBA (Tech
Mngmnt) (Chifley)
mobile:  0432 255 208
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