Sve_GatherVectorFirstFaulting_Bases_double_ulong failing on Linux on 9.0

[svick]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1464473
Build error leg or test failing: _Sve_ro::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong()
Pull request: #129251

Error Message

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{
  "ErrorMessage": "Failed test: _Sve_ro::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong()",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

15:38:52.857 Running test: _Sve_ro::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong()
Beginning scenario: RunBasicScenario_UnsafeRead
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): RunBasicScenario_UnsafeRead failed:
  firstOp: (5E-324, 0)
  secondOp: (266844025628770, 266844025628626)
   result: (NaN, 0)

Beginning scenario: RunBasicScenario_Load
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): RunBasicScenario_Load failed:
  firstOp: (5E-324, 0)
  secondOp: (266844025628770, 266844025628626)
   result: (NaN, 0)

Beginning scenario: RunBasicScenario_LoadFirstFaulting
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64): RunBasicScenario_LoadFirstFaulting failed:
       firstOp: (1, 1)
      secondOp: (266844025628770, 0)
        result: (NaN, 0)
   faultResult: (<1, 0>)

Beginning scenario: RunBasicScenario_FalseMask
Beginning scenario: RunBasicScenario_NonFaulting
Beginning scenario: RunReflectionScenario_UnsafeRead
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): RunReflectionScenario_UnsafeRead failed:
  firstOp: (5E-324, 0)
  secondOp: (266844025628770, 266844025628626)
   result: (NaN, 0)

Beginning scenario: RunLclVarScenario_UnsafeRead
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): RunLclVarScenario_UnsafeRead failed:
  firstOp: (5E-324, 0)
  secondOp: (266844025628770, 266844025628626)
   result: (NaN, 0)

Beginning scenario: RunClassFldScenario
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): RunClassFldScenario failed:
  firstOp: (5E-324, 0)
  secondOp: (266844025628770, 266844025628626)
   result: (NaN, 0)

Beginning scenario: RunStructLclFldScenario
Beginning scenario: RunStructFldScenario
Beginning scenario: ConditionalSelect_FalseOp_mask - operation in TrueValue
Beginning scenario: ConditionalSelect_FalseOp_zero - operation in TrueValue
Beginning scenario: ConditionalSelect_FalseOp_all - operation in TrueValue
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): ConditionalSelectScenario_TrueValue failed:
   maskOp: (NaN, NaN)
  firstOp: (5E-324, 0)
 secondOp: (266844025628770, 266844025628626)
  falseOp: (1.5811164433741558E+19, 1.1526738991456094E+19)
   result: (NaN, 0)

Beginning scenario: ConditionalSelect_FalseOp_mask - operation in FalseValue
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): ConditionalSelectScenario_FalseValue failed:
   maskOp: (0, 0)
  firstOp: (5E-324, 0)
 secondOp: (266844025628770, 266844025628626)
  trueOp: (1.5811164433741558E+19, 1.1526738991456094E+19)
   result: (NaN, 0)

Beginning scenario: ConditionalSelect_FalseOp_zero - operation in FalseValue
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): ConditionalSelectScenario_FalseValue failed:
   maskOp: (0, 0)
  firstOp: (5E-324, 0)
 secondOp: (266844025628770, 266844025628626)
  trueOp: (1.5811164433741558E+19, 1.1526738991456094E+19)
   result: (NaN, 0)

Beginning scenario: ConditionalSelect_FalseOp_all - operation in FalseValue
Beginning scenario: ConditionalSelect_ZeroOp_mask - operation in TrueValue
Beginning scenario: ConditionalSelect_ZeroOp_zero - operation in TrueValue
Beginning scenario: ConditionalSelect_ZeroOp_all - operation in TrueValue
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): ConditionalSelectScenario_TrueValue failed:
   maskOp: (NaN, NaN)
  firstOp: (5E-324, 0)
 secondOp: (266844025628770, 266844025628626)
  falseOp: (0, 0)
   result: (NaN, 0)

Beginning scenario: ConditionalSelect_ZeroOp_mask - operation in FalseValue
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): ConditionalSelectScenario_FalseValue failed:
   maskOp: (0, 0)
  firstOp: (5E-324, 0)
 secondOp: (266844025628770, 266844025628626)
  trueOp: (0, 0)
   result: (NaN, 0)

Beginning scenario: ConditionalSelect_ZeroOp_zero - operation in FalseValue
Sve.GatherVectorFirstFaulting<Double>(Double, UInt64, UInt64): ConditionalSelectScenario_FalseValue failed:
   maskOp: (0, 0)
  firstOp: (5E-324, 0)
 secondOp: (266844025628770, 266844025628626)
  trueOp: (0, 0)
   result: (NaN, 0)

Beginning scenario: ConditionalSelect_ZeroOp_all - operation in FalseValue
System.Exception: One or more scenarios did not complete as expected.
   at JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong() in /__w/1/s/artifacts/tests/coreclr/obj/AnyOS.x64.Checked/Managed/JIT/HardwareIntrinsics/Arm/Sve/Sve_ro/Sve_ro/gen/Sve.GatherVectorFirstFaulting.Bases.double.ulong.cs:line 76
   at Program.<<Main>$>g__TestExecutor3205|0_3206(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)
15:38:53.231 Failed test: _Sve_ro::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong()

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1464473
Error message validated: [Failed test: _Sve_ro::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong()]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 6/15/2026 7:18:53 PM UTC

Report

Build	Repository	Test	Pull Request
1464473	dotnet/runtime	_Sve_ro::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong()	#129251

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	1

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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• Test failure: _Sve_r::JIT.HardwareIntrinsics.Arm._Sve.Program.Sve_GatherVectorFirstFaulting_Bases_double_ulong() #114646

[JulieLeeMSFT]

@a74nh, PTAL.
cc @dhartglassMSFT.

[JulieLeeMSFT]

Please check if we just need to backport #114646 (test fix) to 9.0.

[JulieLeeMSFT]

AI analysis: The #115036 (#115036) template change fixed the test's INPUT address computation: old inArray2[i] += (Op2BaseType)baseArrayPtr built gather addresses as base + index (unscaled), new code uses base + sizeof(elem)*index plus a Debug.Assert. So the old harness fed wrong gather addresses to the intrinsic; the product gathered correctly from the (bad) addresses it was given. The visible 5E-324 symptom comes from the separate #114255 (#114255) mask-generation bug (Int64BitsToDouble(x%2) → bit pattern 1 = 5E-324 instead of 1.0). Hence "test-only": no product/JIT behavior change. Consistent with maintainer kunalspathak's "test issue rather than product issue" conclusion on #112264 (#112264).

[dhartglassMSFT]

Yes - @JulieLeeMSFT the linked item 114646 should fix this. It's referring to mis-aligned double values, and the pointer data in the test log secondOp: (266844025628770, 266844025628626) is not aligned for double*

[dhartglassMSFT]

Grabbing thsi while we figure out what to do with it