8272417: ZGC: fastdebug build crashes when printing ClassLoaderData

[apavlyutkin]

Hi! Here is backport of 8272417 that fixes a crash in ClassLoaderData logging that takes place for debug build. The patch is applied cleanly

Verification (amd64 / Ubuntu 20.04)

alex@alex-VirtualBox:~/8272417$ echo "public class A { public static void main(String... args) { System.gc(); } }" > A.java
alex@alex-VirtualBox:~/8272417$ ./build/linux-x86_64-server-fastdebug/images/jdk/bin/java -XX:+UseZGC -XX:+VerifyAfterGC -Xlog:gc*=trace A.java

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8272417: ZGC: fastdebug build crashes when printing ClassLoaderData

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev pull/643/head:pull/643
$ git checkout pull/643

Update a local copy of the PR:
$ git checkout pull/643
$ git pull https://git.openjdk.org/jdk17u-dev pull/643/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 643

View PR using the GUI difftool:
$ git pr show -t 643

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/643.diff

[bridgekeeper]

👋 Welcome back apavlyutkin! 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 backport pull request has now been updated with issue from the original commit.

[openjdk]

@apavlyutkin This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8272417: ZGC: fastdebug build crashes when printing ClassLoaderData

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 1 new commit pushed to the master branch:

• e3c178d: 6782021: It is not possible to read local computer certificates with the SunMSCAPI provider

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[mlbridge]

Webrevs

• 00: Full (89b66f03)

[apavlyutkin]

/integrate

[openjdk]

@apavlyutkin
Your change (at version 89b66f0) is now ready to be sponsored by a Committer.

[yan-too]

/sponsor

[openjdk]

Going to push as commit 2796eca.
Since your change was applied there has been 1 commit pushed to the master branch:

• e3c178d: 6782021: It is not possible to read local computer certificates with the SunMSCAPI provider

Your commit was automatically rebased without conflicts.

[openjdk]

@yan-too @apavlyutkin Pushed as commit 2796eca.

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