If you try to stop a zone but it remains in shutting_down state, any further action will fail (i.e. detach)

root@solaris1:/root # zoneadm -z solariszone detach
zoneadm: zone ‘solariszones’: detach operation is invalid for shutting_down zones.

First important information is:

We should never kill the zsched process!!.

we have to check on the zone related zombi processes that are blocking our attempt to stop the zone (-z)

root@solaris1:/root # ps -fz  solariszone
     UID   PID  PPID   C    STIME TTY         TIME CMD
    root  4741     1   0 16:25:20 ?           0:16 /opt/jvm/bin/java -Xmx384m -Xminf0.01 -Xmaxf0.4 -Djava.net.preferIPv4S
    root 26085     1   0 16:24:42 ?           0:00 zsched
root@solaris1 :/root # kill -9 4741
root@solaris1 :/root # zoneadm: zone 'b0d03702': zone is already halted