After almost any operation linuxconf is trying to remount all filesystems:

Executing: /bin/umount /                                             
Executing: /bin/mount -t ext2  -o exec,dev,suid,rw LABEL=/ /         
Executing: /bin/umount /boot                                         
Executing: /bin/mount -t ext2  -o exec,dev,suid,rw LABEL=/boot /boot 
Executing: /bin/umount /home                                         
Executing: /bin/mount -t ext2  -o exec,dev,suid,rw LABEL=/home /home 
Changing permissions  of file /etc/shadow .............

This (remointing /) hangs everything and nothing is completed.
because some of the filesystems are busy.

To reproduce - for example change user password,
then before exit click on 
"poreview what will be done"