Re: Help on JVM hang

[Joseph Shraibman]

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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