8371889: [21u] JFR: Deadlock in ThrowableTracer

[rkennke]

This change initializes the event configurations (known as event handlers in earlier JDKs) early, in order to avoid potential deadlocks (see description in the issue).

JDK 21 is the last JDK where this is relevant, that code has been completely reworked in JDK 22 (e.g. JDK-8319374).

Testing:

• jdk/jfr
• tier1

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8371889 needs maintainer approval

Issue

• JDK-8371889: [21u] JFR: Deadlock in ThrowableTracer (Bug - P3 - Requested)

Reviewers

• Erik Gahlin (@egahlin - Committer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2483/head:pull/2483
$ git checkout pull/2483

Update a local copy of the PR:
$ git checkout pull/2483
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2483/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2483

View PR using the GUI difftool:
$ git pr show -t 2483

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2483.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back rkennke! 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.

[rkennke]

/label add hotspot-jfr

[openjdk]

@rkennke
The label hotspot-jfr is not a valid label.
These labels are valid:

[mlbridge]

Webrevs

• 01: Full - Incremental (f20d2cad)
• 00: Full (0a088bfb)

[bridgekeeper]

@rkennke This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply issue a /touch or /keepalive command to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!

[GoeLin]

Hi @rkennke
thanks for fixing this!
Can you please enable the GHA actions on your repo so the tests run?
Also, you might want to prefix your JBS bug with [21u].
Thanks!