RFR: 8287788: Implement a better allocator for downcalls [v18]

[Jorn Vernee]

On Sat, 1 Feb 2025 11:18:18 GMT, Matthias Ernst <duke at openjdk.org> wrote:

>> Matthias Ernst has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix test under VThread factory
>
> Tried for a few hours to repro with various approaches, to no avail.

@mernst-github We have investigated this issue further, and have narrowed it down to an issue with malloc/free. See: https://bugs.openjdk.org/browse/JDK-8350455

At this point, I think it's safe to try and re-integrate this patch, but the `stress` test should be separated out into a separate jtreg test, and then added to the problem list, with a reference to the above issue. 

Note that we already have an issue to redo this patch: https://bugs.openjdk.org/browse/JDK-8349146 Is that something you'd be interested in taking on?

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PR Comment: https://git.openjdk.org/jdk/pull/23142#issuecomment-2673194510