Re: Help on JVM hang

Just got another hang:

"RMI TCP Connection(5752)-199.107.233.207" daemon prio=1 tid=0x08243e08 
nid=0x2420 waiting on condition [4e601000..4e602854]
	at java.util.zip.Inflater.inflate(Inflater.java:219)
	- waiting to lock <0x46292948> (a java.util.zip.Inflater)
	at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:128)
	at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:408)
	at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:450)
	at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:182)
	- locked <0x46317cd8> (a java.io.InputStreamReader)
	at java.io.InputStreamReader.read(InputStreamReader.java:167)
	at java.io.BufferedReader.fill(BufferedReader.java:136)
	at java.io.BufferedReader.readLine(BufferedReader.java:299)
	- locked <0x46317cd8> (a java.io.InputStreamReader)
	at java.io.BufferedReader.readLine(BufferedReader.java:362)
	at org.apache.xerces.util.ObjectFactory.findJarServiceProvider(Unknown 
Source)
	at org.apache.xerces.util.ObjectFactory.createObject(Unknown Source)
	at org.apache.xerces.util.ObjectFactory.createObject(Unknown Source)
	at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
	at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)


Joseph Shraibman wrote:
> Kinda looks like what happened to me.  A lot of threads "waiting on 
> condition" for no reason at all.  For example:
> 
> "Thread-206" prio=1 tid=0x087b7d18 nid=0x7b88 waiting on condition 
> [6e01e000..6e01f854]
>     at java.util.Stack.pop(Stack.java:59)
>     at org.apache.log4j.NDC.pop(NDC.java:274)
> 
> ... and Stack.java looks like:
> 
>     public synchronized Object pop() {
>         Object  obj;
>         int     len = size(); //<===== line 59
> 
>         obj = peek();
>         removeElementAt(len - 1);
> 
>         return obj;
>     }
> 
> Veda N Ponnusamy wrote:
> 
>> Please find attached the thread dump of the JVM. I didn't try running 
>> this app on 1.5 jvm
>>
>> Reg
>> Veda
>>
>>
>> -----Original Message-----
>> From: Joseph Shraibman [mailto:[email protected]]
>> Sent: Friday, June 11, 2004 1:26 PM
>> To: Calvin Austin
>> Cc: Veda N Ponnusamy; [email protected]; [email protected]
>> Subject: Re: Help on JVM hang
>>
>>
>> Calvin Austin wrote:
>>
>>> Does it ever resume. 1.5beta2 has more diagnostics in it and you may 
>>> be able to even attached with jdb (hey tim :*)
>>>
>>> Without seeing the other threads its difficult to see what is 
>>> happening, however there was a bug fix in 1.5 to stop the cache 
>>> growing out of control. A quick test with 1.5 would help a great deal.
>>>
>>
>> I was never able to reproduce the hang on a test machine, it only 
>> happened in production under load.  My boss would kill me if I ran a 
>> beta jvm in production.
>>
>> I also haven't seen the bug for a couple of weeks since I limited the 
>> work done by that jvm in order to avoid the bug.  And I'm not going to 
>> risk freezing our system in order to hit the bug again.
>>
>>
>> If I did attach to the jvm with jdb, what good would it do?  What 
>> would I see that the SIGQUIT thread dump wouldn't show?
> 
> 
> 
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