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A test case that can reproduce this is found at https://github.com/Unarmed/mono-invalidprogram
Building the supplied code on mono and then running it on Windows 8.1 x64 causes a crash. Exception details below.
To reproduce do:
and reproduce crash with
If this is instead run with mono (as in "mono Program.exe") then the program will print the expected output "If you see this then everything is OK!" and exit cleanly. It will do so on all platforms as far as I can tell.
If I instead run the exe without mono (as in just "Program.exe") then at least on my Windows 8.1 x64 I instead see:
Unhandled Exception: System.InvalidProgramException: Common Language Runtime detected an invalid program.
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine](TStateMachine& stateMachine)
at invalid_program.Program.Main(String args)
I have tried building with mono 126.96.36.199 on windows and from the mono:188.8.131.52 docker image, both with the same results.
I have not attempted to reproduce crash on more windows platforms.
I have .Net 4, 4.5 and 4.6 installed on the machine where the crash was found.
Rebuilding through Visual Studio 2015 produces an exe that can be run both with mono and without it.
Fixed in master