reboot gets stuck at "/sbin/modprobe -r vzrst"

[RobFantini]

For awhile trying to reboot some servers gets stuck and a process has to get killed.

   9374 ?        Ss     0:00 /bin/sh /etc/init.d/rc 6
   9380 ?        SL     0:00  \_ startpar -p 4 -t 20 -T 3 -M stop -P 2 -R 6
   9600 ?        S      0:00      \_ /bin/sh /etc/init.d/vz stop
   9652 ?        R     16:27          \_ /sbin/modprobe -r vzrst

to fix I kill the process

ceph3-ib  ~ # kill -9 9652 9600

Has anyone else seen this issue?

I think it only occurs on systems without and vz's running.