[Bug 571933] [NEW] dhclient3 hangs on shutdown

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I have been unable to find a reason why but Lucid is having issues
shutdown down on all systems I have upgraded.  When the reboot command
is called almost all processes are killed, including my active ssh
sessions.  I can immediately log back in via ssh and I find the system
hung on `dhclient3 -r -pf /var/run/dhclient.eth0.pid -lf
/var/lib/dhcp3/dhclient.eth0.leases eth0` with only a few more processes
running, automount, rpc.statd, portmap.  The only thing that will allow
the system to finish shutting down is killing dhclient3, killing any
other process doesn't change the state of the hang.  I have tested the
networking scripts outside of shutdown and they are all functioning
properly.  Running strace on the dhclient3 PID leads to nothing stopping
immediately on a read.  Ps shows the process as in a sk_wait state.

** Affects: dhcp3 (Ubuntu)
     Importance: Undecided
         Status: New

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dhclient3 hangs on shutdown
https://bugs.edge.launchpad.net/bugs/571933
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