netfs service kills all processes in the system after terminating

Issue

• In certain situation, running

# service netfs stop 

• This kills everything, including shell scripts that are supposed to bring the system down, when service netfs stop is called after switching to runlevel 6.
• On system with psmisc older than psmisc-22.6-19.el6_5, one has buggy /sbin/fuser - it expects PIDs to be only 5-digits long, longer are concatenated, giving something like:

$ fuser -m /home/test/ 2>/dev/null; echo
  3188109050109166109167109168109169109170109171109172109173109174109175
$

• /bin/kill doesn't check errno after calling strtol() when converting argument to integer. This kills everything.

# service netfs stop
Unmounting NFS filesystems:  umount.nfs: /nfs: device is busy
umount.nfs: /nfs: device is busy
umount.nfs: /home/test: device is busy
umount.nfs: /home/test: device is busy
                                                           [FAILED]
 Read from remote host localhost: Connection reset by peer