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

[Thomas Schatzl]

Hi,

On Thu, 2014-04-17 at 14:27 +0200, 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/
> 

  looks appropriate.

Thomas