One mupdate master always dies on startup

[Gary Mills]

Below are the logs of the startup of a mupdate master server.  On
completion, two copies of `mupdate -m' are running as children of
the master.  However, three copies are actually started but the second
one always terminates with a bind failure.  Otherwise, they appear to
be running normally.  What's going on?

Mar  3 09:51:33 castor master[14284]: [ID 965400 local6.notice] process started
Mar  3 09:51:34 castor ctl_cyrusdb[14285]: [ID 702911 local6.notice] recovering cyrus databases
Mar  3 09:51:34 castor ctl_cyrusdb[14285]: [ID 275131 local6.notice] skiplist: recovered /imap/mupdate/conf/mailboxes.db (2 records, 332 bytes) in 0 seconds
Mar  3 09:51:34 castor ctl_cyrusdb[14285]: [ID 275131 local6.notice] skiplist: recovered /imap/mupdate/conf/annotations.db (0 records, 144 bytes) in 0 seconds
Mar  3 09:51:34 castor ctl_cyrusdb[14285]: [ID 127214 local6.notice] done recovering cyrus databases
Mar  3 09:51:34 castor master[14284]: [ID 139525 local6.notice] ready for work
Mar  3 09:51:34 castor ctl_cyrusdb[14287]: [ID 702911 local6.notice] checkpointing cyrus databases
Mar  3 09:51:34 castor mupdate[14289]: [ID 166678 local6.error] bind: /imap/mupdate/conf/socket/mupdate.target: Address already in use
Mar  3 09:51:34 castor mupdate[14289]: [ID 702911 local6.error] bind failed
Mar  3 09:51:34 castor master[14284]: [ID 684980 local6.warning] service mupdate pid 14289 in READY state: terminated abnormally
Mar  3 09:51:34 castor ctl_cyrusdb[14287]: [ID 127214 local6.notice] done checkpointing cyrus databases

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-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-