[8u-dev] Request for approval to backport: 8157306 and 8162496

[Rob McKenna]

Approved

	-Rob

On 07/09/16 12:17, Vladimir Kozlov wrote:
> Hi!
> 
> I'd like to get an approval to backport this fix to jdk8u.
> 
> https://bugs.openjdk.java.net/browse/JDK-8157306 "Random infrequent null
> pointer exceptions in javac"
> https://bugs.openjdk.java.net/browse/JDK-8162496 "missing precedence edge
> for anti_dependence"
> 
> http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/f6c7981c093e
> http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/6f10754f85d9
> 
> Changes are applied cleanly to 8u sources. They were tested in JDK 9 for
> more then 2 weeks already.
> 
> No new tests were added since the problem showed with existing Hotspot jtreg
> tests for both bugs.
> 
> We found very dangerous problem which should be fixed in all releases. It is
> rare but cause incorrect behavior due to wrong ordering of depending stores
> and loads. The verification added for JDK-8162496 found several places which
> cause this.
> 
> Thanks,
> Vladimir