10.1.0.4 listener process spawns a new listener process

Hi
Last week we had a problem with the listener on one of our 10.1.0.4 databases.
the TNS connections were timing out, and no one was able to connect ( unless as a local connection from the DB server ).
When I did ps -ef | grep -i listener I saw TWO listener processes with the same name , one is spawned by the other.
The only way to solve this was to kill -9 the new listener process
Is this a normal behavior for the listener to spawn another listener process ? and if saw - why did it cause all connections to hung ?
Any known bug regarding this ?
I did find a couple of reports of this behavior in 10. but no followup
http://dbaforums.org/oracle/index.php?showtopic=991
http://oracle.ittoolbox.com/groups/technical-functional/oracle-db-l/spawns-new-rogue-listener-with-same-name-as-original-644065
Thanks in advance for any explanation
Orna

I think this is the cause of your problem
http://coskan.wordpress.com/2007/04/05/child-listener-problem/
post based on Note:340091.1
Coskan Gundogar
http://coskan.wordpress.com

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