8359959: Test runtime/NMT/VirtualAllocTestType.java failed: '\\[0x[0]*7f7dc4043000 - 0x[0]*7f7dc4083000\\] reserved 256KB for Test' missing from stdout/stderr

[afshin-zafari]

The test expects that two disjunct regions are reserved but checked it incompletely.
It is fixed by reserving a new (third) region with the required size and then released the middle region among these three regions.
In Windows, it is not possible/valid to release middle regions. Either a whole region or a region that has the same end-address with the whole region can be released. IOW, only 'release the whole' or 'release from address A up to the end' are valid.

Since it (reserving two regions that become adjacent) is not happening always, the test failed occasionally at different tiers.

Tested local linux-x64-debug.

---

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

Issue

• JDK-8359959: Test runtime/NMT/VirtualAllocTestType.java failed: '\[0x[0]*7f7dc4043000 - 0x[0]*7f7dc4083000\] reserved 256KB for Test' missing from stdout/stderr (Bug - P4)

Reviewers

• David Holmes (@dholmes-ora - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/25894/head:pull/25894
$ git checkout pull/25894

Update a local copy of the PR:
$ git checkout pull/25894
$ git pull https://git.openjdk.org/jdk.git pull/25894/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 25894

View PR using the GUI difftool:
$ git pr show -t 25894

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/25894.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back azafari! 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]

@afshin-zafari 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:

8359959: Test runtime/NMT/VirtualAllocTestType.java failed: '\\[0x[0]*7f7dc4043000 - 0x[0]*7f7dc4083000\\] reserved 256KB for Test' missing from stdout/stderr

Reviewed-by: dholmes

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 15 new commits pushed to the master branch:

• c6ab63d: 8359735: [Ubuntu 25.10] java/lang/ProcessBuilder/Basic.java, java/lang/ProcessHandle/InfoTest.java fail due to rust-coreutils
• ff54a64: 8360049: CodeInvalidationReasonTest.java fails with ZGC on AArch64
• c11f36e: 8356708: C2: loop strip mining expansion doesn't take sunk stores into account
• ... and 12 more: https://git.openjdk.org/jdk/compare/08b1fa4cb39e56497052e3ee13e679c8734cf7c5...master

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]

@afshin-zafari The following label will be automatically applied to this pull request:

• hotspot-runtime

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 02: Full - Incremental (55795425)
• 01: Full - Incremental (5c90d0a0)
• 00: Full (d24755a5)

[dholmes-ora]

Just to be clear we are only releasing the original mappings to keep things consistent? And we could do this before reserving the new three region mapping - right?

[afshin-zafari]

Not applicable in new approach. PR description is updated.

[dholmes-ora]

Okay - I think I follow that.

Thanks

[dcubed-ojdk]

@afshin-zafari - I have ProblemListed this test on all platforms to reduce any noise
over the weekend. Please remember to resync your repo and remove the ProblemListing
as part of this PR.