8312394: [linux] SIGSEGV if kernel was built without hugepage support

[tstuefe]

Hi all,

This patch is one in a small line of preparatory patches that aim, ultimately, to fix https://bugs.openjdk.org/browse/JDK-8312182 ("THPs cause huge RSS due to thread start timing issue").

This particular patch fixes an issue where the JVM would crash on startup when started on a linux box with a kernel that does not support hugepages (mostly affected by this are small SBCs)

---

Progress

• Change must not contain extraneous whitespace
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Issue

• JDK-8312394: [linux] SIGSEGV if kernel was built without hugepage support (Bug - P3)

Reviewing

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[bridgekeeper]

👋 Welcome back stuefe! 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]

@tstuefe 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:

8312394: [linux] SIGSEGV if kernel was built without hugepage support

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 4 new commits pushed to the master branch:

• 82d7bc5: 8312180: (bf) MappedMemoryUtils passes incorrect arguments to msync (aix)
• c17b5d7: 8314501: Shenandoah: sun/tools/jhsdb/heapconfig/JMapHeapConfigTest.java fails
• f07aa56: 8314426: runtime/os/TestTrimNative.java is failing on slow machines
• 1c3409b: 8313752: InstanceKlassFlags::print_on doesn't print the flag names

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.

[mlbridge]

Webrevs

• 00: Full (539eb738)

[tstuefe]

Tests clean, apart from riscv, which is an infrastructure issue. Got approval.

/integrate

[openjdk]

Going to push as commit 3f889a8.
Since your change was applied there have been 17 commits pushed to the master branch:

• 4909911: 8314960: Add Certigna Root CA - 2
• f5eef20: 8314850: SharedRuntime::handle_wrong_method() gets called too often when resolving Continuation.enter
• 46ce555: 8313796: AsyncGetCallTrace crash on unreadable interpreter method pointer
• b96aa3c: 8311592: ECKeySizeParameterSpec causes too many exceptions on third party providers
• a34b844: 8313701: GHA: RISC-V should use the official repository for bootstrap
• c849fa5: 8309214: sun/security/pkcs11/KeyStore/CertChainRemoval.java fails after 8301154
• 4729fad: 8313312: Add missing classpath exception copyright header
• 7a2aa86: 8314020: Print instruction blocks in byte units
• 17a7fc3: 8314730: GHA: Drop libfreetype6-dev transitional package in favor of libfreetype-dev
• f6bd169: 8313901: [TESTBUG] test/hotspot/jtreg/compiler/codecache/CodeCacheFullCountTest.java fails with java.lang.VirtualMachineError
• ... and 7 more: https://git.openjdk.org/jdk21u/compare/d6a4e469e4b2bba2f699d36c7b04aa0381a72c42...master

Your commit was automatically rebased without conflicts.

[openjdk]

@tstuefe Pushed as commit 3f889a8.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.