8287663: Add a regression test for JDK-8287073

[jerboaa]

Clean backport after "JDK-8287107: CgroupSubsystemFactory.setCgroupV2Path asserts with freezer controller". Mostly a regression test, low risk.

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Progress

• Change must not contain extraneous whitespace
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Issue

• JDK-8287663: Add a regression test for JDK-8287073

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev pull/1341/head:pull/1341
$ git checkout pull/1341

Update a local copy of the PR:
$ git checkout pull/1341
$ git pull https://git.openjdk.org/jdk11u-dev pull/1341/head

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$ git pr checkout 1341

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$ git pr show -t 1341

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https://git.openjdk.org/jdk11u-dev/pull/1341.diff

[bridgekeeper]

👋 Welcome back sgehwolf! A progress list of the required criteria for merging this PR into pr/1340 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.

[mlbridge]

Webrevs

• 01: Full (4d44e1ac)
• 00: Full (c233a7cd)

[openjdk-notifier]

The dependent pull request has now been integrated, and the target branch of this pull request has been updated. This means that changes from the dependent pull request can start to show up as belonging to this pull request, which may be confusing for reviewers. To remedy this situation, simply merge the latest changes from the new target branch into this pull request by running commands similar to these in the local repository for your personal fork:

git checkout jdk-8287663-11u-backport
git fetch https://git.openjdk.org/jdk11u-dev master
git merge FETCH_HEAD
# if there are conflicts, follow the instructions given by git merge
git commit -m "Merge master"
git push

[openjdk]

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

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

8287663: Add a regression test for JDK-8287073

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:

• 1afd1f4: 8287073: NPE from CgroupV2Subsystem.getInstance()

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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[openjdk-notifier]

@jerboaa Please do not rebase or force-push to an active PR as it invalidates existing review comments. All changes will be squashed into a single commit automatically when integrating. See OpenJDK Developers’ Guide for more information.

[jerboaa]

/integrate

[openjdk]

Going to push as commit 351508c.
Since your change was applied there have been 3 commits pushed to the master branch:

• 0cd49f5: 8278344: sun/security/pkcs12/KeytoolOpensslInteropTest.java test fails because of different openssl output
• 90a6418: 8287741: Fix of JDK-8287107 (unused cgv1 freezer controller) was incomplete
• 1afd1f4: 8287073: NPE from CgroupV2Subsystem.getInstance()

Your commit was automatically rebased without conflicts.

[openjdk]

@jerboaa Pushed as commit 351508c.

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