[jcifs] Deadlock in Java code.

Matthew Tippett matthew.tippett at sympatico.ca
Wed Dec 4 00:25:13 EST 2002

Java 1.4 under Linux, when doing a thread monitor dump with <CTRL-\> it 
also detects deadlocks.

It is repeatable by having existing connections open and removing the 
network cable (or killing power on the windows box).



Allen, Michael B (RSCH) wrote:
> Is this "Found one Java-level deadlock" message being printed by the thread monitor dump? Is this reproducible?
>>-----Original Message-----
>>From:	Matthew Tippett [SMTP:matthew at casero.com]
>>Sent:	Monday, December 02, 2002 11:01 AM
>>To:	jcifs at lists.samba.org
>>Subject:	[jcifs] Deadlock in Java code.
>>If a remote system goes down while a connection is active, the following
>>deadlock seems to occur.  Derived by <CTRL-\> under Linux.
>>Found one Java-level deadlock:
>>   waiting to lock monitor 0x808749c (object 0x447c21a0, a 
>>   which is held by "Thread-9"
>>   waiting to lock monitor 0x808814c (object 0x447ab990, a 
>>   which is held by "JCIFS-SmbTransport"
>>Java stack information for the threads listed above:
>>	at jcifs.smb.SmbTree.treeDisconnect(SmbTree.java:130)
>>	- waiting to lock <0x447c21a0> (a jcifs.smb.SmbTree)
>>	at jcifs.smb.SmbSession.logoff(SmbSession.java:121)
>>	- locked <0x447ab990> (a jcifs.smb.SmbSession)
>>	at jcifs.smb.SmbTransport.tryClose(SmbTransport.java:280)
>>	at jcifs.smb.SmbTransport.run(SmbTransport.java:403)
>>	at java.lang.Thread.run(Thread.java:536)
>>	at jcifs.smb.SmbSession.sessionSetup(SmbSession.java:94)
>>	- waiting to lock <0x447ab990> (a jcifs.smb.SmbSession)
>>	at jcifs.smb.SmbSession.send(SmbSession.java:85)
>>	at jcifs.smb.SmbTree.treeConnect(SmbTree.java:123)
>>	- locked <0x447c21a0> (a jcifs.smb.SmbTree)
>>	at jcifs.smb.SmbFile.connect(SmbFile.java:496)
>>	at jcifs.smb.SmbFile.connect0(SmbFile.java:466)
>>	at jcifs.smb.SmbFile.queryPath(SmbFile.java:839)
>>	at jcifs.smb.SmbFile.exists(SmbFile.java:914)
>>	at
>>	at 
>>	at
>>	at java.lang.Thread.run(Thread.java:536)
>>Found 1 deadlock.
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Matthew Tippett - matthew.tippett at sympatico.ca - (416) 435-4118
Technology Forum - http://www.technology-forum.org/
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