Comment 6 for bug 515138

update: although I am using XLock screen locker, those zombies are created automatically....

possibly related to messages like this in /var/log/auth.log (are those zombies over critical mass and multiplicating themselves??)

Jan 2 20:59:58 computer su[24373]: pam_unix(su:session): session closed for user username
Jan 2 21:00:24 computer su[24527]: Successful su for username by root
Jan 2 21:00:24 computer su[24527]: + ??? root:username
Jan 2 21:00:24 computer su[24527]: pam_unix(su:session): session opened for user username by (uid=0)
Jan 2 21:00:24 computer su[24527]: pam_unix(su:session): session closed for user username
Jan 2 21:00:52 computer su[24694]: Successful su for username by root
Jan 2 21:00:52 computer su[24694]: + ??? root:username
Jan 2 21:00:52 computer su[24694]: pam_unix(su:session): session opened for user username by (uid=0)
Jan 2 21:00:52 computer su[24694]: pam_unix(su:session): session closed for user username
Jan 2 21:01:19 computer su[24857]: Successful su for username by root
Jan 2 21:01:19 computer su[24857]: + ??? root:username
Jan 2 21:01:19 computer su[24857]: pam_unix(su:session): session opened for user username by (uid=0)
Jan 2 21:01:19 computer su[24857]: pam_unix(su:session): session closed for user username
Jan 2 21:01:46 computer su[25017]: Successful su for username by root
Jan 2 21:01:46 computer su[25017]: + ??? root:username
Jan 2 21:01:46 computer su[25017]: pam_unix(su:session): session opened for user username by (uid=0)
Jan 2 21:01:46 computer su[25017]: pam_unix(su:session): session closed for user username