Re: WOSessionStore deadlock
Re: WOSessionStore deadlock
- Subject: Re: WOSessionStore deadlock
- From: Kieran Kelleher <email@hidden>
- Date: Wed, 29 Apr 2009 17:39:33 -0400
Funny ... I got my first session deadlock in a long while just a few
minutes ago... had to kill the instance. Stack trace here:
http://67.78.26.66:81/~kieran/misc/deadlock-5183.txt
WO 5.3.3 BTW
On Apr 29, 2009, at 1:05 PM, Guido Neitzer wrote:
On Apr 29, 2009, at 9:58 AM, Chuck Hill wrote:
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?
Bad coding? :-P
I can think of only four causes:
1. Exception thrown from sleep().
2. Exception thrown from terminate() (not 100% sure of that)
3. Exception thrown from WODirectAction.performAction() (though I
am pretty sure this was fixed in WO 5.3)
It wasn't. At least not for everything.
cug
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