Java 21 clinit deadlock

[David Holmes]

Hi Simone,

Thanks for the logs. Unfortunately they shed no light on what is 
happening. There is no sign of the MutableHttpFields class starting 
actual initialization, though we can see that it was linked (verified). 
And there are no exceptions indicated relevant to the class loading and 
initialization process that I can discern.

The class initialization logging is unfortunately rather sparse and I 
think we would need to add some additional logging to shed further light 
on this. Are you in a position to patch the sources, create a custom 
build and test again with that build?

Cheers,
David

On 12/09/2023 6:35 pm, Simone Bordet wrote:
> David,
> 
> On Mon, Sep 11, 2023 at 9:29 AM Simone Bordet <simone.bordet at gmail.com> wrote:
>>
>> Hi,
>>
>> On Mon, Sep 11, 2023 at 7:22 AM David Holmes <david.holmes at oracle.com> wrote:
>>> I've looked at the dump and there is no sign that the MutableHttpFields
>>> is actively in use. It suggests to me that class initialization has
>>> failed but the class state has not been correctly updated and the
>>> waiters released. There were some changes in JDK 21 about how failures
>>> in this area were handled, so it is possible I/we got something wrong.
>>> Is it possible to try running this with additional logging enabled e.g.
>>>
>>> -Xlog:class+init=debug -Xlog:exceptions=debug
>>
>> We will try this, than you!
> 
> Here is another failed run:
> JVM threads dump: https://gist.github.com/olamy/b3e20a76f0fc77232882b9be95db47e1
> JVM output (gist is truncated, download full file):
> https://gist.githubusercontent.com/olamy/86f0a1215c722e5e9acf96cae597422e/raw/4404693c39fd767122d34a7a3dde1d797afa6f25/gistfile1.txt
> 
> The JVM stops outputting at 2.360s, then we have a Jetty idle timeout
> after 30 seconds, then we see:
> 
> [51.472s][debug][exceptions] Thread::clear_pending_exception: cleared
> exception:java.lang.VirtualMachineError '.
> 
> And then more log lines follow after another 5 minutes.
> 
> Let us know your findings.
> 
> Thanks!
>