[Pkg-shadow-devel] Bug#396691: login: newgrp doesn't allow me to switch back to my primary group

[Georg Neis]

Package: login
Version: 1:4.0.18.1-5
Severity: normal

# adduser foobar
Adding user `foobar' ...
Adding new group `foobar' (1003) ...
Adding new user `foobar' (1003) with group `foobar' ...
Creating home directory `/home/foobar' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for foobar
Enter the new value, or press ENTER for the default
        Full Name []: 
        Room Number []: 
        Work Phone []: 
        Home Phone []: 
        Other []: 
Is the information correct? [y/N] y
# adduser foobar cdrom
Adding user `foobar' to group `cdrom' ...
Done.
# ssh foobar at localhost
Password: 
Last login: Thu Nov  2 11:36:46 2006 from localhost.localdomain
foobar at traal:~$ id
uid=1003(foobar) gid=1003(foobar) groups=24(cdrom),1003(foobar)
foobar at traal:~$ newgrp cdrom
foobar at traal:~$ id
uid=1003(foobar) gid=24(cdrom) groups=24(cdrom),1003(foobar)
foobar at traal:~$ newgrp foobar
Password: 
Sorry.

Is it really intended that I am not able to switch back to my main
group?

Best regards,
Georg

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-1-k7
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages login depends on:
ii  libc6                        2.3.6.ds1-7 GNU C Library: Shared libraries
ii  libpam-modules               0.79-4      Pluggable Authentication Modules f
ii  libpam-runtime               0.79-4      Runtime support for the PAM librar
ii  libpam0g                     0.79-4      Pluggable Authentication Modules l

login recommends no packages.

-- no debconf information