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[release/11.0] Fix null vnStore dereference in optAssertionProp_HWIntrinsic - #134665

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@github-actions github-actions Bot commented Sep 25, 2026 •

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Backport of #134441 to release/11.0

/cc @LoopedBard3 @copilot

Customer Impact

  • Customer reported
  • Found internally

[Select one or both of the boxes. Describe how this issue impacts customers, citing the expected and actual behaviors and scope of the issue. If customer-reported, provide the issue number.]

Regression

  • Yes
  • No

[If yes, specify when the regression was introduced. Provide the PR or commit if known.]

Testing

[How was the fix verified? How was the issue missed previously? What tests were added?]

Risk

[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]

IMPORTANT: If this backport is for a servicing release, please verify that:

  • For .NET 8 and .NET 9: The PR target branch is release/X.0-staging, not release/X.0.
  • For .NET 10+: The PR target branch is release/X.0 (no -staging suffix).

Package authoring no longer needed in .NET 9

IMPORTANT: Starting with .NET 9, you no longer need to edit a NuGet package's csproj to enable building and bump the version.
Keep in mind that we still need package authoring in .NET 8 and older versions.

…4441)

- [x] Confirm the assertion-propagation precondition and build a clean
baseline.
- [x] Guard the hardware-intrinsic optimization and add focused
regression coverage.
- [x] Run targeted builds/tests, formatting, and code/security review.
- [x] Finalize the minimal fix. Resolves #134435

<!-- START COPILOT CODING AGENT SUFFIX -->

- Fixes #134435

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: EgorBo <523221+EgorBo@users.noreply.github.com>
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@github-actions github-actions Bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Sep 25, 2026
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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