Hi.

Just a while ago I was playing with vsftpd (adding groups, users etc.)
and suddenly I couldn't su - from normal user. This seems very awkward
because I haven't touched anything linked to this command. I can
normally login to root account and to my user account, but when i try
to su - from user (or root) I only see blank screen and there is no
reaction at all. Normally the password field appears and after typing
it everything works but... well the password field doesn't appear. It
looks like infinite loop (the cpu usage is 100%!)

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+
COMMAND
 1946 root      20   0 14712  856  688 R  100  0.0   0:06.11 su

su -
(nothing happens, empty line -> you can type anything here)

I've checked everything and it seems it should work as it did.

bash-4.1# ls -l `which su`
-rws--x--x 1 root root 66179 2010-02-28 21:19 /bin/su

bash-4.1# cat /etc/login.defs | grep WHEEL
SU_WHEEL_ONLY   no

Operations I've made today while playing with vsftpd.

Dec 10 19:04:14 linux su[6612]: Successful su for root by user
Dec 10 19:04:14 linux su[6612]: + /dev/pts/0 user:root
Dec 10 19:20:30 linux groupadd[6970]: group added to /etc/group:
name=ftp-users, GID=1000
Dec 10 19:20:30 linux groupadd[6970]: group added to /etc/gshadow:
name=ftp-users
Dec 10 19:20:30 linux groupadd[6970]: new group: name=ftp-users,
GID=1000
Dec 10 19:22:37 linux useradd[6982]: new user: name=ftp, UID=1001,
GID=1000, home=/mnt/hd/ftp/, shell=/bin/bash
Dec 10 19:24:29 linux passwd[6987]: password for 'ftp' changed by
'root'
Dec 10 20:00:32 linux usermod[7226]: change user 'ftp' shell from '/
bin/bash' to '/sbin/nologin'
Dec 10 20:11:57 linux login[1505]: invalid password for 'root'  on '/
dev/tty1'
Dec 10 20:12:04 linux login[1505]: ROOT LOGIN  on '/dev/tty1'
Dec 10 20:12:52 linux userdel[1525]: delete user 'ftp'
Dec 10 20:13:07 linux groupdel[1532]: group 'ftp-users' removed from /
etc/group
Dec 10 20:13:07 linux groupdel[1532]: group 'ftp-users' removed from /
etc/gshadow
Dec 10 20:13:07 linux groupdel[1532]: group 'ftp-users' removed

19.00-19.25 everything works fine.
About ~20 the problem appears.

Any ideas? I've got no clue what could've happened.

Regards,
duro

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