8352765: G1CollectedHeap::expand_and_allocate() may fail to allocate even after heap expansion succeeds

[jerboaa]

Clean backport. Testing this to verify a customer issue.

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8352765 needs maintainer approval

Issue

• JDK-8352765: G1CollectedHeap::expand_and_allocate() may fail to allocate even after heap expansion succeeds (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/1924/head:pull/1924
$ git checkout pull/1924

Update a local copy of the PR:
$ git checkout pull/1924
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/1924/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1924

View PR using the GUI difftool:
$ git pr show -t 1924

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/1924.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.