RFR (S) 8225681: vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine fails due a) MT-unsafe modification of inline cache

[coleen.phillimore at oracle.com]

Adding serviceability-dev.
Coleen

On 9/25/19 5:22 PM, coleen.phillimore at oracle.com wrote:
> Summary: allow old methods in 
> CompiledStaticDirectCall::set_to_interpreted
>
> This is the comment in the bug that describes this race and this fix:
> https://bugs.openjdk.java.net/browse/JDK-8225681?focusedCommentId=14278441&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14278441 
>
>
> The rest of the bug and sightings are actually caused by 
> https://bugs.openjdk.java.net/browse/JDK-8226690,
> and this one might have been caused by it also, but the race that Erik 
> describes is possible as well.
>
> The s390 code had an exception for callee->is_compiled_lambda_form() 
> which should probably apply to all the platforms, so the code is the 
> same on all the platforms with this change.
>
> Tested with tier1-6.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8225681.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8225681
>
> Thanks,
> Coleen