[ci-scan] Build break: NativeAOT linker alignment error in PhysicalPromotion test (arm64) #129936

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1484197
Build error leg or test failing: linux-arm64 Checked NativeAOT_Pri1 - JIT/Directed/Directed_3.csproj

Error Details

NativeAOT test build fails on linux-arm64 with a linker alignment error in the mixedpromotion_PhysicalPromotion__FromOldToPhysicalMismatched function. The linker (ld.lld) reports an improper alignment for relocation R_AARCH64_LDST64_ABS_LO12_NC. This prevents the entire NativeAOT_Pri1 test leg from running on linux-arm64.

ld.lld : error : Directed_3.o:(function mixedpromotion_PhysicalPromotion__FromOldToPhysicalMismatched: __managedcode+0x1c1530): improper alignment for relocation R_AARCH64_LDST64_ABS_LO12_NC: 0x74A52C is not aligned to 8 bytes [src/tests/JIT/Directed/Directed_3.csproj]
clang-22 : error : linker command failed with exit code 1 (use -v to see invocation) [src/tests/JIT/Directed/Directed_3.csproj]

Error Message

true only for clear infra flakes. ExcludeConsoleLog skips helix log scanning. -->

{
  "ErrorMessage": "mixedpromotion_PhysicalPromotion__FromOldToPhysicalMismatched",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Impact on platforms

• runtime-nativeaot-outerloop (def 265) / linux-arm64 Checked NativeAOT_Pri1 / Build Tests task / build break (linker error)

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1483800
• Finished: 2026-06-27T02:10:55Z
• Previous build 1482646 (2026-06-26T13:27:39Z) passed this leg successfully.
• Occurrences in window: 3 (builds 1483800, 1484197, 1484485)

Duplicate search

• PhysicalPromotion__FromOldToPhysicalMismatched label:"Known Build Error" — 0 results
• R_AARCH64_LDST64_ABS_LO12_NC label:"Known Build Error" — 0 results
• improper alignment NativeAOT is:issue is:open — 0 results
• PhysicalPromotion alignment is:pr is:open — 0 results
• mixedpromotion PhysicalPromotion is:pr — 0 results

No existing KBE or PR matches this signature.

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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Summary