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

[Vladimir Kozlov]

thank you, Rob

Vladimir

On 9/7/16 12:33 PM, Rob McKenna wrote:
> 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