RFR(xs): 8040245: G1: VM hangs during shutdown

[Jon Masamitsu]

Per,

Change looks good.

Reviewed.

Jon

On 4/17/2014 5:27 AM, Per Liden wrote:
> Hi,
>
> Could I please have this fix reviewed.
>
> Summary: JDK-8037112 added controlled shutdown of concurrent marking 
> threads in G1 during VM exit, to prevent these threads from using 
> resources that are destroyed later in the shutdown phase. However, it 
> turns out there are at least two unrelated bugs (I've filed 
> JDK-8040803 and JDK-8040804) in the concurrent mark code which under 
> some circumstances can provoke the concurrent mark threads to hang, 
> and thus prevent the VM from exiting. This patch temporarily disables 
> the controlled shutdown of the CM threads (because it causes timeouts 
> in our testing) until those other bugs have been sorted out, at which 
> point we should enabled this again (filed JDK-8040807 to track that).
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8040245
> Webrev: http://cr.openjdk.java.net/~pliden/8040245/webrev.0/
>
> Thanks!
> /Per