Hi!

This is a "Request for Experience" kind of email. :) I'm having a really hard time to track down issue and I would like to know if any of you has already seen this symptoms, and have any clue of what might be going on.

My problems is the following: occasionally (and it doesn't seem to depend on the load, as it occurs on weekdays during peak usage as well as weekends) a session will not expire after the defined 60 minutes, and it will exist forever. Apparently, it won't cause any problem to the app, besides locking down some WorkerThreads.

I've done several thread dumps, including one as soon as I detected this (the session had about 62 minutes of idle time). The only thing weird I saw is something that, at first, I thought it was a consequence of the problem, whatever that was, but now I think it's tied to the cause, as I see anything else that might be causing this.

  I have 3 threads like this, all waiting on the same monitor:

"WorkerThread15" prio=5 tid=0x08995400 nid=0x8995600 in Object.wait() [0xbf0dd000..0xbf0ddb80]
        at java.lang.Object.wait(Native Method)
- waiting on <0x34000548> (a com.webobjects.appserver.WOSessionStore $TimeoutEntry)
        at java.lang.Object.wait(Object.java:474)
at com .webobjects .appserver.WOSessionStore.checkOutSessionWithID(WOSessionStore.java:207) - locked <0x34000548> (a com.webobjects.appserver.WOSessionStore $TimeoutEntry) at com .webobjects .appserver.WOApplication.restoreSessionWithID(WOApplication.java:1546) at er .extensions .appserver.ERXApplication.restoreSessionWithID(ERXApplication.java:2028)
...

I noticed Wonder has something to detect session store deadlocks, but it works only when concurrent requests are off, and we have that feature turned on.

What can be causing a session to be checked out, but not checked in again?

  Yours

Miguel Arroz

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