RFR: 8348668: Prevent first resource cleanup in confined arena from escaping

[Jorn Vernee]

On Tue, 28 Jan 2025 03:31:58 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Why do you think it should? We never assign the newly allocated resource cleanup to `fst`.
>
> So was the culprit `cleanup.next = fst;`?

Yes, in combination with the while loop which runs all the cleanups, which adds a phi node that merges  the instance with `null`, at which point EA gives up.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23321#discussion_r1931999047