Your /etc/gshadow file has no permissions enabled. The /etc/gshadow- files seems to be a working replacement. Maybe for a PAM module that adds audit info, or failtoban,,etc.
If your distro uses RPM, try "rpm -qf /etc/gshadow-" to see what package installed it. Also try using lsof to see if any program has it open.
Last edited by jschiwal; 01-09-2013 at 08:42 PM.