Tests failed on WASM with NRE in CustomAttributeTypedArgument.CanonicalizeValue

[danmoseley]

net5.0-Browser-Release-wasm-Mono_Release-Ubuntu.1804.Amd64.Open

https://dev.azure.com/dnceng/public/_build/results?buildId=733324&view=ms.vss-test-web.build-test-results-tab&runId=22691562&resultId=139620&paneView=debug

#39420

System.SpanTests.ReadOnlySpanTests.Overlap

System.NullReferenceException : Object reference not set to an instance of an object.


Stack trace
   at System.Reflection.CustomAttributeTypedArgument.CanonicalizeValue(Object value)
   at System.Reflection.CustomAttributeTypedArgument..ctor(Type argumentType, Object value)
   at System.Reflection.CustomAttributeData.ResolveArguments()
   at System.Reflection.CustomAttributeData.get_ConstructorArguments()
   at ReflectionAbstractionExtensions.GetCustomAttributes(IMethodInfo methodInfo, Type attributeType)

[danmoseley]

Same for unrelated Asn1 test:

System.NullReferenceException : Object reference not set to an instance of an object.


Stack trace
   at System.Reflection.CustomAttributeTypedArgument.CanonicalizeValue(Object value)
   at System.Reflection.CustomAttributeTypedArgument..ctor(Type argumentType, Object value)
   at System.Reflection.CustomAttributeData.ResolveArguments()
   at System.Reflection.CustomAttributeData.get_ConstructorArguments()
   at ReflectionAbstractionExtensions.GetCustomAttributes(IMethodInfo methodInfo, Type attributeType)

[safern]

@akoeplinger and I were looking at this. This is a flaky issue that started happening yesterday morning. @akoeplinger is suspecting of: ef2ecfd#diff-a70a13cf973dcdf79e3a506980ae1a2d

I looked at the first build that hit this which ran against the following commits:
HEAD is now at 23d574901 Merge 5e493d6 into 37cf387

The commit in question above is not in that tree, however there is: c80cc2a#diff-a70a13cf973dcdf79e3a506980ae1a2d

But I don't have enough expertise to know that? Maybe the runtime is returning null when doing GetType().

This is flaky enough that I was not able to get a repro, but since this is hit when Xunit tries to get attributes for the test to execute, it could hit any test case.

cc: @marek-safar @vargaz @BrzVlad @steveisok