Catching a StackOverflowException

[joshcomley]

If I have this simple app:

using System;

namespace PlayGround.Core.Console
{
	public class Program
	{
		public static void Main(string[] args)
		{
			try
			{
				DoSomething();
			}
			catch(Exception e)
			{
				System.Console.WriteLine("Bugger");
			}

		}

		private static void DoSomething()
		{
			DoSomething();
		}
	}
}

The exception handler itself is never called, instead the app crashes and I get this error:

The same happens if I use the StackOverflowException in the catch instead of just Exception.

Is there anyway to catch a StackOverflow exception and not have the app crash?

[sharwell]

To date I have not found a way to handle a StackOverflowException within a .NET process, outside of the case where you use the hosting API to launch the CLR in a non-standard mode which allows these exceptions to be caught. I've tried everything I could think of, including routing calls through an intermediate unmanaged C++ library using unmanaged exception handlers to try and prevent the CLR from seeing the exception. I would be delighted if someone found a way to "intercept" this exception on a thread.

📝 The expectation is a StackOverflowException cannot be caught in a managed application. The CLR goes to great lengths to remove your ability to handle it. If there exists a way to catch it, I would not expect it to be reliable since it would indicate a "hole" in the intended feature set and a later update could easily remove the ability.

[jkotas]

Right, StackOverflowException is non cachable.

Related to #4113

[masums]

But there should have any way to prevent app crash for StackOverflowException because for that full web app crashes. Which is an unexpected behavior.