Debugger crash on macOS (Rosetta 2 on M1)

[johnvcoleman]

I'm not sure this is where I need to put this or if you guys are even entertaining bugs for the M1 yet, but here goes...

Repro steps

Debugging the default console "hello world" project in VSCode results in an apparent crash of the debugger:

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

Debug Console output:

-------------------------------------------------------------------
You may only use the Microsoft .NET Core Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software
to help you develop and test your applications.
-------------------------------------------------------------------
Loaded '/usr/local/share/dotnet/shared/Microsoft.NETCore.App/5.0.0/System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Stack overflow.
   at System.Collections.HashHelpers.GetPrime(Int32)
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Initialize(Int32)
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]..ctor(Int32, System.Collections.Generic.IEqualityComparer`1<System.__Canon>)
   at System.AppContext.Setup(Char**, Char**, Int32)

Running the dll from the command line in a terminal window is successful:

johncoleman@edgar net5.0 % ls
ref                             test.dll                        test.runtimeconfig.dev.json
test.deps.json                  test.pdb                        test.runtimeconfig.json
johncoleman@edgar net5.0 % dotnet test.dll 
Hello World!
johncoleman@edgar net5.0 % 

Crash is reproducible, happens every time.

Thanks.

[Jidongang]

Having the same problem. try run without debug

Tagging subscribers to this area: @tommcdon
See info in area-owners.md if you want to be subscribed.

Issue Details

---

I'm not sure this is where I need to put this or if you guys are even entertaining bugs for the M1 yet, but here goes...

Repro steps

Debugging the default console "hello world" project in VSCode results in an apparent crash of the debugger:

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

Debug Console output:

-------------------------------------------------------------------
You may only use the Microsoft .NET Core Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software
to help you develop and test your applications.
-------------------------------------------------------------------
Loaded '/usr/local/share/dotnet/shared/Microsoft.NETCore.App/5.0.0/System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Stack overflow.
   at System.Collections.HashHelpers.GetPrime(Int32)
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Initialize(Int32)
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]..ctor(Int32, System.Collections.Generic.IEqualityComparer`1<System.__Canon>)
   at System.AppContext.Setup(Char**, Char**, Int32)

Running the dll from the command line in a terminal window is successful:

johncoleman@edgar net5.0 % ls
ref                             test.dll                        test.runtimeconfig.dev.json
test.deps.json                  test.pdb                        test.runtimeconfig.json
johncoleman@edgar net5.0 % dotnet test.dll 
Hello World!
johncoleman@edgar net5.0 % 

Crash is reproducible, happens every time.

Thanks.

Author:	johnvcoleman
Assignees:	-
Labels:	area-Diagnostics-coreclr, untriaged
Milestone:	-

[tommcdon]

Thank you for reporting the issue!
Adding @jeffhandley in case this is a known issue with System.Collections.HashHelpers.GetPrime and rosetta 2
FYI @caslan

[petrkoutnycz]

Is there any chance it would be fixed earlier pls?

[tommcdon]

Adding @sdmaclea @janvorli who have been investigating Rosetta 2 issues

[janvorli]

I wonder if the Stack overflow could somehow be caused by the stack probing issues we've recently discovered and caused by the fact that the Apple Silicon uses 16kB memory pages unlike other systems where the memory page size is 4kB.

[sdmaclea]

@petrkoutnycz We would target fixing this for .NET 5.0 with Rosetta 2.

@janvorli I'll take a look to see if this issue is fixed with the stack probing fix

[janvorli]

I can confirm I can repro the issue locally on M1 device. I am looking into it.