RFR: 8316746: Top of lock-stack does not match the unlocked object [v2]

[Dean Long]

On Mon, 25 Sep 2023 21:14:11 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> I think we need to support "Top of lock-stack does not match the unlocked object" and take the slow path. Reason: see JBS issue.
>> Currently only PPC64, x86_64 and aarch64 code. I'd like to get feedback before implementing it for other platforms (needed for all platforms).
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add x86_64 and aarch64 implementation.

As Roman said, the C2 locks should be balanced, and the lock stack looks correct:  nsk.share.jdi.EventHandler.run locks listeners first, then the EventHandler.  Maybe something is going wrong in deoptimization?  Pushing this change without understanding the cause could make it harder to find the real problem.

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PR Comment: https://git.openjdk.org/jdk/pull/15903#issuecomment-1734677034