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 

It should be possible to reproduce on either an x64 or AArch64 mac machine using:


make test TEST=test/jdk/java/foreign/TestBufferStack.java JTREG_REPEAT_COUNT=1000


It will take a while to run/fail. The failure seems to be detected by the `malloc` implementation on mac. The process fails with exit code 134 without any output, but the core file should be usable.

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PR Comment: https://git.openjdk.org/jdk/pull/23142#issuecomment-2631053427