RFR (S): JDK-8069004: Kitchensink hanged with 16Gb heap and GC pause >30 min

[Thomas Schatzl]

Hi Derek,

On Mon, 2015-03-30 at 12:54 -0400, Derek White wrote:
> This is a P1 bug in JDK 9 - a conflict when freeing
> continues_humongous regions. 
> 
> The scenario is a region was continues_humongous is then freed by one
> worker when the whole H-object is freed. The continues_humongous
> region needs to be claimed by the first worker, otherwise other
> workers may run into the free region. It turns out the fix was to
> revert a change made a few months ago.
>
> It didn't help out that an assert actually did the right thing, so it
> never failed in debug code :-)
> 
> BUG: JDK-8069004  Kitchensink hanged with 16Gb heap and GC pause >30
> min 
> Webrev: http://cr.openjdk.java.net/~drwhite/8069004/webrev.00/ 
> 
> Ran jprt.

Looks good.

Thanks for catching this,
  Thomas