Test failure: System.Numerics.Tensors.Tests.UIntPtrGenericTensorPrimitives.DivRem_ScalarSpan_AllLengths

[SakeTao]

Failed in: runtime-coreclr libraries-jitstress2-jitstressregs 20250531.1

Failed tests:

net10.0-windows-Release-x86-jitstress2_jitstressregs0x80-Windows.10.Amd64.Open
    - System.Numerics.Tensors.Tests.UIntPtrGenericTensorPrimitives.DivRem_ScalarSpan_AllLengths
    - System.Numerics.Tensors.Tests.UInt32GenericTensorPrimitives.DivRem_ScalarSpan_AllLengths
net10.0-linux-Release-x64-jitstress2_jitstressregs0x80-Ubuntu.2204.Amd64.Open
    - System.Numerics.Tensors.Tests.UInt32GenericTensorPrimitives.DivRem_ScalarSpan_AllLengths

Error message:

 Assert.All() Failure: 10 out of 256 items in the collection did not pass.
[4]:  Item:  5
      Error: Assert.Equal() Failure: Values differ
             Expected: 96538360
             Actual:   0
[5]:  Item:  6
      Error: Assert.Equal() Failure: Values differ
             Expected: 3
             Actual:   1
[6]:  Item:  7
      Error: Assert.Equal() Failure: Values differ
             Expected: 0
             Actual:   1
[8]:  Item:  9
      Error: Assert.Equal() Failure: Values differ
             Expected: 208996192
             Actual:   0
[9]:  Item:  10
      Error: Assert.Equal() Failure: Values differ
             Expected: 1894293973
             Actual:   0
[10]: Item:  11
      Error: Assert.Equal() Failure: Values differ
             Expected: 13
             Actual:   0
[11]: Item:  12
      Error: Assert.Equal() Failure: Values differ
             Expected: 2
             Actual:   0
[12]: Item:  13
      Error: Assert.Equal() Failure: Values differ
             Expected: 1198335355
             Actual:   0
[13]: Item:  14
      Error: Assert.Equal() Failure: Values differ
             Expected: 465868099
             Actual:   0
[14]: Item:  15
      Error: Assert.Equal() Failure: Values differ
             Expected: 3
             Actual:   0

Stack trace:

   at System.Numerics.Tensors.Tests.GenericIntegerTensorPrimitivesTests`1.DivRem_ScalarSpan_AllLengths() in /_/src/libraries/System.Numerics.Tensors/tests/TensorPrimitives.Generic.cs:line 1942
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args) in /_/src/coreclr/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.CoreCLR.cs:line 36
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr) in /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs:line 57

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[jakobbotsch]

This does not repro for me. It likely requires AVX512.

@dotnet/jit-contrib anyone with an AVX512 machine that wants to take a look?