RFR: 8268635: Corrupt oop in ClassLoaderData [v2]

[Coleen Phillimore]

On Wed, 7 Jul 2021 01:31:07 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> We worked on writing a test for this but weren't successful.  Based on analysis by @stefank this missing call may have been the cause of the crash.
>> Tested with tier1-3.
>
> Coleen Phillimore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
> 
>   8268635: Corrupt oop in ClassLoaderData

Thanks David and Xin, thanks for noticing the clearly redundant record_modified_oops.  It was left over from when dependency oops were not in the _handles area.
@dholmes-ora Serial and Parallel GC clear modified oops in a safepoint. I don't remember how G1 used this field. It has some mechanism of claiming the CLD.  Maybe @tschatzl or Kim can check it out.

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PR: https://git.openjdk.java.net/jdk/pull/4701