Re: Help on JVM hang

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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