Re: WOSessionStore deadlock
Re: WOSessionStore deadlock
- Subject: Re: WOSessionStore deadlock
- From: Chuck Hill <email@hidden>
- Date: Thu, 7 May 2009 10:40:26 -0700
That does not tell us much. Didn't you implement a fix for exceptions
thrown while generating the response?
Chuck
On Apr 29, 2009, at 2:26 PM, Kieran Kelleher wrote:
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
Thread t@57091: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- java.lang.Object.wait() @bci=2, line=474 (Interpreted frame)
-
com
.webobjects
.appserver.WOSessionStore.checkOutSessionWithID(java.lang.String,
com.webobjects.appserver.WORequest) @bci=48, line=207 (Interpreted
frame)
-
com
.webobjects
.appserver.WOApplication.restoreSessionWithID(java.lang.String,
com.webobjects.appserver.WOContext) @bci=9, line=1546 (Interpreted
frame)
-
er
.extensions
.appserver.ERXApplication.restoreSessionWithID(java.lang.String,
com.webobjects.appserver.WOContext) @bci=83, line=2060 (Interpreted
frame)
-
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedApplication
(com.webobjects.appserver.WOApplication,
com.webobjects.appserver.WOContext,
com.webobjects.foundation.NSDictionary) @bci=57, line=314
(Interpreted frame)
-
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._handleRequest(com.webobjects.appserver.WORequest) @bci=109,
line=358 (Interpreted frame)
-
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
.handleRequest(com.webobjects.appserver.WORequest) @bci=46, line=435
(Interpreted frame)
-
com
.webobjects
.appserver
.WOApplication.dispatchRequest(com.webobjects.appserver.WORequest)
@bci=41, line=1306 (Interpreted frame)
-
er
.extensions
.appserver
.ERXApplication
.dispatchRequestImmediately(com.webobjects.appserver.WORequest)
@bci=74, line=1769 (Interpreted frame)
-
er
.extensions
.appserver
.ERXApplication.dispatchRequest(com.webobjects.appserver.WORequest)
@bci=13, line=1734 (Interpreted frame)
-
wk
.webobjects
.appserver
.WKApplication.dispatchRequest(com.webobjects.appserver.WORequest)
@bci=2, line=95 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.runOnce()
@bci=729, line=173 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=129,
line=254 (Interpreted frame)
- java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)
etc.
--
Chuck Hill Senior Consultant / VP Development
Come to WOWODC'09 in San Fran this June!
http://www.wocommunity.org/wowodc09/
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