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

[Per Liden]

Thanks Bengt, thanks Thomas!

cheers,
/Per

On 04/17/2014 04:35 PM, Thomas Schatzl wrote:
> 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
>