RFR: 8316746: Top of lock-stack does not match the unlocked object [v3]

[Dean Long]

On Thu, 28 Sep 2023 10:38:52 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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Pass may_be_unordered information to lightweight_unlock.
>  - Merge remote-tracking branch 'origin' into 8316746_lock_stack
>  - Add x86_64 and aarch64 implementation.
>  - 8316746: Top of lock-stack does not match the unlocked object

Thinking about this some more, aren't we going to hit this problem every time the monitor is inflated, either because of contention, recursive entry, or running out of lock stack slots?

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PR Comment: https://git.openjdk.org/jdk/pull/15903#issuecomment-1751506640