[14] RFR 8235829: graal crashes with Zombie.java test

[Per Liden]

Hi Coleen,

The "nmethod entry barrier"-part looks good to me. Just one minor nit, 
maybe JvmtiDeferredEventQueue::run_nmethod_entry_barrier should have an 
"s" on it (i.e. JvmtiDeferredEventQueue::run_nmethod_entry_barriers) 
since it loops over all entries in the queue?

But I don't dare to comment on the ServiceThread initialization order.

cheers,
Per

On 12/16/19 12:41 PM, coleen.phillimore at oracle.com wrote:
> Summary: Start ServiceThread before compiler threads, and run nmethod 
> barriers for zgc before adding to the service thread queue, or posting 
> the events on the java thread queue.
> 
> See bug for description of the problems found with the new Zombie.java 
> test.
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8235829.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8235829
> 
> Ran tier1 all platforms, and tier2-8 testing, as well as rerunning 
> original test failure from bug 
> https://bugs.openjdk.java.net/browse/JDK-8173361.
> 
> Thanks,
> Coleen