8359472: JVM crashes when attaching a dynamic agent before JVMTI_PHASE_LIVE

[fandreuz]

This PR contains a clean backport of JDK-8359472.

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8359472 needs maintainer approval

Issue

• JDK-8359472: JVM crashes when attaching a dynamic agent before JVMTI_PHASE_LIVE (Bug - P3 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2489/head:pull/2489
$ git checkout pull/2489

Update a local copy of the PR:
$ git checkout pull/2489
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2489/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2489

View PR using the GUI difftool:
$ git pr show -t 2489

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Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2489.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back fandreuzzi! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[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.

[openjdk]

⚠️ @fandreuz This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (52bacaa2)

[fandreuz]

/approval request Fixes a crash happening when an agent tries to load before live phase. The fix is simple and tests are attached to verify all use cases. Passes tier1.

[openjdk]

@fandreuz
8359472: The approval request has been created successfully.