rhel8 arm64 throws NullReferenceExceptions #43349
Description
In our CI builds, each run on RHEL8 arm64 shows NullReferenceExceptions in the log.
On the same arm64 host with a Fedora 32 VM there are no NullReferenceExceptions.
When I build and test on another RHEL8 arm64 machine, NullReferenceExceptions also show up in unexpected places.
Some example stack traces from CI log:
Microsoft.Extensions.Hosting tests
�[m�[31;1m�[m�[37m System.NullReferenceException : Object reference not set to an instance of an object.
�[m�[30;1m Stack Trace:
�[m�[37m /home/tester/runtime/src/coreclr/src/System.Private.CoreLib/src/System/Array.CoreCLR.cs(521,0): at System.SZArrayHelper.GetEnumerator[T]()
�[m�[37m /home/tester/runtime/src/libraries/System.Linq/src/System/Linq/Single.cs(136,0): at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
�[m�[37m at System.Reflection.NetCoreReflectionExtensions.GetConstructor(Type type, BindingFlags bindingAttr, Object binder, Type[] types, Object[] modifiers)
�[m�[37m at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.EnsureValidBaseType(Type type)
�[m�[37m at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.GenerateCode(Type proxyTargetType, Type[] interfaces, ProxyGenerationOptions options)
�[m�[37m at Castle.DynamicProxy.DefaultProxyBuilder.CreateInterfaceProxyTypeWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options)
�[m�[37m at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyTypeWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options)
�[m�[37m at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, IInterceptor[] interceptors)
�[m�[37m at Moq.CastleProxyFactory.CreateProxy(Type mockType, IInterceptor interceptor, Type[] interfaces, Object[] arguments)
�[m�[37m at Moq.Mock`1.InitializeInstance()
�[m�[37m at Moq.Mock`1.OnGetObject()
�[m�[37m at Moq.Mock.get_Object()
�[m�[37m at Moq.Mock`1.get_Object()
�[m�[37m /home/tester/runtime/src/libraries/Microsoft.Extensions.Hosting/tests/UnitTests/Internal/HostTests.cs(583,0): at Microsoft.Extensions.Hosting.Internal.HostTests.<>c__DisplayClass22_0.<HostStopAsyncCanBeCancelledEarly>b__3(IServiceCollection services)
�[m�[37m /home/tester/runtime/src/libraries/Microsoft.Extensions.Hosting/src/HostingHostBuilderExtensions.cs(121,0): at Microsoft.Extensions.Hosting.HostingHostBuilderExtensions.<>c__DisplayClass7_0.<ConfigureServices>b__0(HostBuilderContext context,
System.Linq.Parallel.Tests
�[m�[31;1m�[m�[37m System.NullReferenceException : Object reference not set to an instance of an object.
�[m�[30;1m Stack Trace:
�[m�[37m /home/tester/runtime/src/libraries/System.Linq.Parallel/src/System/Linq/Parallel/Enumerables/ParallelQuery.cs(104,0): at System.Linq.ParallelQuery`1.Cast[TCastTo]()
�[m�[37m /home/tester/runtime/src/libraries/System.Linq.Parallel/src/System/Linq/ParallelEnumerable.cs(5271,0): at System.Linq.ParallelEnumerable.Cast[TResult](ParallelQuery source)
�[m�[37m /home/tester/runtime/src/libraries/System.Linq.Parallel/tests/QueryOperators/CastTests.cs(105,0): at System.Linq.Parallel.Tests.CastTests.Cast_Empty(Labeled`1 labeled, Int32 count)
System.Text.Json.Serialization.Tests
�[m�[31;1m�[m�[37m System.NullReferenceException : Object reference not set to an instance of an object.
�[m�[30;1m Stack Trace:
�[m�[37m /home/tester/runtime/src/libraries/System.Text.Json/tests/Serialization/SerializationWrapper.cs(104,0): at System.Text.Json.Serialization.Tests.SerializationWrapper.WriterSerializerWrapper.SerializeWrapper[T](T value, JsonSerializerOptions options)
�[m�[37m /home/tester/runtime/src/libraries/System.Text.Json/tests/Serialization/PolymorphicTests.cs(125,0): at System.Text.Json.Serialization.Tests.PolymorphicTests.ArrayAsRootObject()
�[m�[37m --- End of stack trace from previous location ---
@janvorli I don't know how to debug this, can you take a look? or give me some pointers?
cc @omajid