Crash: when accessing 2nd mocked class object (see example)

[mohand1993]

The following code block cause the crash below.

var obj = new Mock<Object>().Object;
var stream = new Mock<Stream>().Object;

• Assertion at dynamic-image.c:209, condition `prev == MONO_HANDLE_RAW (obj)' not met

Stacktrace:

at <0xffffffff>
at (wrapper managed-to-native) System.Reflection.Emit.ModuleBuilder.getToken (System.Reflection.Emit.ModuleBuilder,object,bool) <0x00015>
at System.Reflection.Emit.ModuleBuilder.GetToken (System.Reflection.MemberInfo,bool) [0x00061] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection.Emit/ModuleBuilder.cs:793
at System.Reflection.Emit.ModuleBuilderTokenGenerator.GetToken (System.Reflection.MemberInfo,bool) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection.Emit/ModuleBuilder.cs:1207
at System.Reflection.Emit.ILGenerator.Emit (System.Reflection.Emit.OpCode,System.Reflection.MethodInfo) [0x0004e] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection.Emit/ILGenerator.cs:734
at Castle.DynamicProxy.Generators.Emitters.SimpleAST.MethodTokenExpression.Emit (Castle.DynamicProxy.Generators.Emitters.IMemberEmitter,System.Reflection.Emit.ILGenerator) [0x0000c] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.Emitters.SimpleAST.AssignStatement.Emit (Castle.DynamicProxy.Generators.Emitters.IMemberEmitter,System.Reflection.Emit.ILGenerator) [0x00019] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.Emitters.CodeBuilders.AbstractCodeBuilder.Generate (Castle.DynamicProxy.Generators.Emitters.IMemberEmitter,System.Reflection.Emit.ILGenerator) [0x00058] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.Emitters.ConstructorEmitter.Generate () [0x0001e] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.EnsureBuildersAreInAValidState () [0x000c6] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.BuildType () [0x00001] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.ClassProxyGenerator.GenerateType (string,System.Type[],Castle.DynamicProxy.Generators.INamingScope) [0x0015d] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.ClassProxyGenerator/<>c__DisplayClass1.b__0 (string,Castle.DynamicProxy.Generators.INamingScope) [0x0000e] in <1da8a528a77240358e1afd90a17b1a27>:0
at Castle.DynamicProxy.Generators.BaseProxyGenerator.ObtainProxyType (Castle.DynamicProxy.Generators.CacheKey,System.Func3<string, Castle.DynamicProxy.Generators.INamingScope, System.Type>) [0x00141] in <1da8a528a77240358e1afd90a17b1a27>:0 at Castle.DynamicProxy.Generators.ClassProxyGenerator.GenerateCode (System.Type[],Castle.DynamicProxy.ProxyGenerationOptions) [0x00064] in <1da8a528a77240358e1afd90a17b1a27>:0 at Castle.DynamicProxy.DefaultProxyBuilder.CreateClassProxyType (System.Type,System.Type[],Castle.DynamicProxy.ProxyGenerationOptions) [0x0002c] in <1da8a528a77240358e1afd90a17b1a27>:0 at Castle.DynamicProxy.ProxyGenerator.CreateClassProxyType (System.Type,System.Type[],Castle.DynamicProxy.ProxyGenerationOptions) [0x00009] in <1da8a528a77240358e1afd90a17b1a27>:0 at Castle.DynamicProxy.ProxyGenerator.CreateClassProxy (System.Type,System.Type[],Castle.DynamicProxy.ProxyGenerationOptions,object[],Castle.DynamicProxy.IInterceptor[]) [0x00064] in <1da8a528a77240358e1afd90a17b1a27>:0 at Moq.Proxy.CastleProxyFactory.CreateProxy (System.Type,Moq.Proxy.ICallInterceptor,System.Type[],object[]) [0x0004a] in <1da8a528a77240358e1afd90a17b1a27>:0 at Moq.Mock1<T_REF>.b__24_0 () [0x00092] in <1da8a528a77240358e1afd90a17b1a27>:0
at Moq.PexProtector.Invoke (System.Action) [0x00001] in <1da8a528a77240358e1afd90a17b1a27>:0
at Moq.Mock1<T_REF>.InitializeInstance () [0x0000c] in <1da8a528a77240358e1afd90a17b1a27>:0 at Moq.Mock1<T_REF>.OnGetObject () [0x00011] in <1da8a528a77240358e1afd90a17b1a27>:0
at Moq.Mock.GetObject () [0x00001] in <1da8a528a77240358e1afd90a17b1a27>:0
at Moq.Mock.get_Object () [0x00001] in <1da8a528a77240358e1afd90a17b1a27>:0
at Moq.Mock`1<T_REF>.get_Object () [0x00001] in <1da8a528a77240358e1afd90a17b1a27>:0

[stakx]

This works fine both on the CLR (.NET), as well as on my installation of Mono (the following being the version information of my installation as dumped by mono --version):

Mono JIT compiler version 5.2.0 (Visual Studio built mono)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: normal
SIGSEGV: normal
Notification: Thread + polling
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen

What OS and version of Mono are you running your code on?

[stakx]

@mohand1993: Without any more info, it's hard to follow up on this. I suspect this is more of a problem with the Mono runtime than it is with Moq (see above) so perhaps it would be good if you reported that with the Mono team.

I'm closing this for the time being due to a lack of sufficient information. Please post back if you want to follow up on this, we can reopen the issue.

[bartdkmediahuis]

@stakx : Having the same issue :

Mono JIT compiler version 5.4.0.201 (2017-06/71277e78f6e Thu Sep 21 19:22:55 EDT 2017) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: normal SIGSEGV: altstack Notification: kqueue Architecture: amd64 Disabled: none Misc: softdebug LLVM: yes(3.6.0svn-mono-master/8b1520c8aae) GC: sgen (concurrent by default)

[stakx]

@mohand1993, @bartdkmediahuis: Apparently that Mono version (5.4.0.201) is affected by some sort of bug, it's nothing to do with Moq. See #481.

I suggest you use a different version of Mono. (5.2 wasn't affected, AFAIK, and perhaps they've published a fixed version by now.)