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8328822: C2: "negative trip count?" assert failure in profile predicate code #497

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shipilev
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@shipilev shipilev commented Apr 12, 2024

Simple corner case fix in C2.

Additional testing:

  • New regression test fails without the fix, passes with it
  • Linux x86_64 server fastdebug, all
  • Linux x86_64 server fastdebug, 100K Fuzzer tests
  • Linux x86_64 server fastdebug, Maven CTW tests

Progress

  • Change must not contain extraneous whitespace
  • Commit message must refer to an issue
  • JDK-8328822 needs maintainer approval

Issue

  • JDK-8328822: C2: "negative trip count?" assert failure in profile predicate code (Bug - P3 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/497/head:pull/497
$ git checkout pull/497

Update a local copy of the PR:
$ git checkout pull/497
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/497/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 497

View PR using the GUI difftool:
$ git pr show -t 497

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/497.diff

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bridgekeeper bot commented Apr 12, 2024

👋 Welcome back shade! 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.

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openjdk bot commented Apr 12, 2024

@shipilev 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:

8328822: C2: "negative trip count?" assert failure in profile predicate code

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 50 new commits pushed to the master branch:

  • 3892078: 8324121: SIGFPE in PhaseIdealLoop::extract_long_range_checks
  • 3ab3f52: 8326974: ODR violation in macroAssembler_aarch64.cpp
  • 5d5c678: 8319713: Parallel: Remove PSAdaptiveSizePolicy::should_full_GC
  • 56a9090: 8312014: [s390x] TestSigInfoInHsErrFile.java Failure
  • c922c50: 8322962: Upcall stub might go undetected when freezing frames
  • cbd30c9: 8325095: C2: bailout message broken: ResourceArea allocated string used after free
  • 75ac9e8: 8328168: Epsilon: Premature OOM when allocating object larger than uncommitted heap size
  • a0e8de8: 8330156: RISC-V: Range check auipc + signed 12 imm instruction
  • e7ebae5: 8321713: Harmonize executeTestJvm with create[Limited]TestJavaProcessBuilder
  • d8bc9e4: 8331113: createJMHBundle.sh support configurable maven repo mirror
  • ... and 40 more: https://git.openjdk.org/jdk21u-dev/compare/7743b6ca05b8486eeb38cbbe74569401ce62fe2a...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 openjdk bot changed the title Backport 2ceeb6c00135310b7bdabacb92d26d81de525240 8328822: C2: "negative trip count?" assert failure in profile predicate code Apr 12, 2024
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openjdk bot commented Apr 12, 2024

This backport pull request has now been updated with issue from the original commit.

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openjdk bot commented Apr 12, 2024

⚠️ @shipilev This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

@openjdk openjdk bot added the rfr Pull request is ready for review label Apr 12, 2024
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mlbridge bot commented Apr 12, 2024

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/approval request Simple corner case fix in C2. Passes all tests; regression test is sensitive to the bug. The lower than usual risk for C2 changes, as fix is trivial.

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openjdk bot commented Apr 15, 2024

@shipilev
8328822: The approval request has been created successfully.

@openjdk openjdk bot added the approval label Apr 15, 2024
@openjdk openjdk bot added ready Pull request is ready to be integrated and removed approval labels May 2, 2024
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shipilev commented May 2, 2024

/integrate

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openjdk bot commented May 2, 2024

Going to push as commit 87d5da4.
Since your change was applied there have been 50 commits pushed to the master branch:

  • 3892078: 8324121: SIGFPE in PhaseIdealLoop::extract_long_range_checks
  • 3ab3f52: 8326974: ODR violation in macroAssembler_aarch64.cpp
  • 5d5c678: 8319713: Parallel: Remove PSAdaptiveSizePolicy::should_full_GC
  • 56a9090: 8312014: [s390x] TestSigInfoInHsErrFile.java Failure
  • c922c50: 8322962: Upcall stub might go undetected when freezing frames
  • cbd30c9: 8325095: C2: bailout message broken: ResourceArea allocated string used after free
  • 75ac9e8: 8328168: Epsilon: Premature OOM when allocating object larger than uncommitted heap size
  • a0e8de8: 8330156: RISC-V: Range check auipc + signed 12 imm instruction
  • e7ebae5: 8321713: Harmonize executeTestJvm with create[Limited]TestJavaProcessBuilder
  • d8bc9e4: 8331113: createJMHBundle.sh support configurable maven repo mirror
  • ... and 40 more: https://git.openjdk.org/jdk21u-dev/compare/7743b6ca05b8486eeb38cbbe74569401ce62fe2a...master

Your commit was automatically rebased without conflicts.

@openjdk openjdk bot added the integrated Pull request has been integrated label May 2, 2024
@openjdk openjdk bot closed this May 2, 2024
@openjdk openjdk bot removed ready Pull request is ready to be integrated rfr Pull request is ready for review labels May 2, 2024
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openjdk bot commented May 2, 2024

@shipilev Pushed as commit 87d5da4.

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

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