Weblogic: ONE thread cause CPU soaring(50%+),NEVER die,why?

hi,
My environment is as follows:
APPSERVER: weblogic 8.1.4 sp4
JDK: IBM jdk1.4
OS: AIX 5.3
DB: oracle
our app model is as follows:
user | server | cluster
user1 \************/server1
user2 -- proxy server -- server2
user3 / ***********\server3
(https) (http)
the proxy server and server1/2/3 are all in one domain(server1/2/3 one cluster),
once we restart the proxy server,everything looks fine,but 1 or 2 days
later,the CPU start soaring,from 10~20% to 50%(proxy server cpu usage),
however,the server1/2/3 are all healty(cpu not high),if we restart server1/2/3
the problem still exist, and after some time,the cpu would be up to 90%+,then
we MUST restart the proxy server,then everything ok again.
Now the cpu is 50%+,we checked the proxy server's active threads,and found ONE
thread whose id is 252 continue exist and the request never change during one day.
the thread state is :
252 13262 weblogic.t3.srvr.SSLListenThread$1@2778a170 n/a n/a
then we get the thread dump by kill -3,we get this info about this thread:
at 0xD3764B18 in
"ExecuteThread: '252' for queue: 'weblogic.kernel.Default'" (TID:0x300C2168, sys_thread_t:0x7E6F08A8, state:R, native ID:0x10506) prio=5
at com.rsa.jsafe.JCMPInt.addVectors(Unknown Source)
at com.rsa.jsafe.JCMPInt.addInPlace(Unknown Source)
at com.rsa.jsafe.JCMPInt.subtractSigned(Unknown Source)
at com.rsa.jsafe.JCMPInt.modInvertSchroeppel(Unknown Source)
at com.rsa.jsafe.JCMPInt.modInvert(Unknown Source)
at com.rsa.jsafe.JA_RSA.generateBlindingValues(Unknown Source)
at com.rsa.jsafe.JA_RSA.generateBlindingValuesBuffer(Unknown Source)
at com.rsa.jsafe.JA_RSAPrivateKey.getKeyDataBlind(Unknown Source)
at com.rsa.jsafe.JA_RSAPrivateKey.getKeyData(Unknown Source)
at com.rsa.jsafe.JA_KeyData.getKeyData(Unknown Source)
at com.rsa.jsafe.JA_RSA.generalDecryptInit(Unknown Source)
at com.rsa.jsafe.JA_RSA.decryptInit(Unknown Source)
at com.rsa.jsafe.JG_AsymmetricCipher.doDecryptInit(Unknown Source)
at com.rsa.jsafe.JSAFE_AsymmetricCipher.decryptInit(Unknown Source)
at com.rsa.jsafe.JSAFE_AsymmetricCipher.decryptInit(Unknown Source)
at com.certicom.tls.provider.cipher.JSAFE_RSA.init(Unknown Source)
at com.certicom.tls.record.handshake.ServerStateSentHelloDone.handle(Unknown Source)
at com.certicom.tls.record.handshake.HandshakeHandler.handleHandshakeMessage(Unknown Source)
at com.certicom.tls.record.handshake.HandshakeHandler.handleHandshakeMessages(Unknown Source)
at com.certicom.tls.record.MessageInterpreter.interpretContent(Unknown Source)
at com.certicom.tls.record.MessageInterpreter.decryptMessage(Unknown Source)
at com.certicom.tls.record.ReadHandler.processRecord(Unknown Source)
at com.certicom.tls.record.ReadHandler.readRecord(Unknown Source)
at com.certicom.tls.record.ReadHandler.readUntilHandshakeComplete(Unknown Source)
at com.certicom.tls.interfaceimpl.TLSConnectionImpl.completeHandshake(Unknown Source)
at javax.net.ssl.impl.SSLSocketImpl.startHandshake(Unknown Source)
at com.bea.sslplus.CerticomSSLContext.forceHandshakeOnAcceptedSocket(Unknown Source)
at weblogic.security.utils.SSLContextWrapper.forceHandshakeOnAcceptedSocket(SSLContextWrapper.java(Compiled Code))
at weblogic.t3.srvr.SSLListenThread$1.execute(SSLListenThread.java(Compiled Code))
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java(Compiled Code))
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java(Compiled Code))
we start google,but nothing found about this problem.The only way to solve this problem now is to restart
the proxy server,can anyone help me to solve this problem? any response is appreciated!!!
cowrie / 2009-6-3

why,please help me ....

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Hi Anya!
Thanks for the response. Regarding your question, Yes, I have confirmed that people were receiving multiple copies.
I've confirmed this as I had left a Gmail message open on my browser window and opened that same message from Mail: As I was writing the response from Mail, without sending anything, new notifications started to appear over the same message in the browser window, notifying me there were new messages from Myself! So when I started to open those "new replies", I came to the conclusion that as I was typing, a draft was being saved and sent as a new message at the same time, therefore sending a lot of emails until I finished to write the message without knowing...
Hard to explain but hope I've made my point.
Thanks!
D

More than one Thread accessing the same records in the database

Hi, I have more than one thread accessing a synchronized method called getMinPrimaryKey() which gets the lowest of the primary key frm the table based on the a flag which is set to true. once it is retrieved the same method also sets the flag as false so it is not retrieved the second time. so next time a different thread calls this method it should retrieve the next available lowest primarmy key.
but even when i have the method as synchronized different threads keep returning the same primary key instead of getting the next sequence. can some one let me know where I might go wrong and what could be the solution. is it because when once i retrieve the record and set the flag as false, i also need to commit it?, which could be the reason the select query still picks up the same primary key. please help me out on this.
thanks,
Harish

Correction. If different threads always return the same key then your table isn't getting up dated. If different threads sometimes return the same key, then either the database is committing lazily, or else the threads are calling getMinPrimaryKey on different objects and so are not executing atomically with respect to each other.

Weblogic: ONE thread cause CPU soaring(50%+),NEVER die,why?

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