WOSessionStore$TimeoutEntry

we have a linux server running our web objects app. After a day, the system
locks up for 30 mins. It will self-recoverbut in the mean time, nobody can
log in or use the app. I have seen thread dumps during this period and I
have noticed the following trace:


"http-20226-Processor24" daemon prio=1 tid=0x52321880 nid=0x593 in
Object.wait() [0x51b7d000..0x51b7e120]
	at java.lang.Object.wait(Native Method)
	- waiting on <0xaaede7d8> (a
com.webobjects.appserver.WOSessionStore$TimeoutEntry)
	at java.lang.Object.wait(Object.java:474)
	at
com.webobjects.appserver.WOSessionStore.checkOutSessionWithID(WOSessionStore.java:191)
	- locked <0xaaede7d8> (a
com.webobjects.appserver.WOSessionStore$TimeoutEntry)
	at
com.webobjects.appserver.WOApplication.restoreSessionWithID(WOApplication.java:1904)

There are a lot of http threads in this state. There is one lock for every 4
http threads waiting on it. 

Can any one explain what the above means?
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