System.DllNotFoundException: libc

[qqq-tech]

Installed product versions

• Visual Studio: 2017 community
• This extension: 1.5.2

Description

when i run remote debuuger, i can't run program.
because of the error below.

System.DllNotFoundException: libc

Steps to recreate

1. Replace this
2. text with
3. the steps
4. to recreate

Current behavior

Explain what it's doing and why it's wrong

Expected behavior

Explain what it should be doing after it's fixed.

[techcap]

Please check with the Hello World.

[qqq-tech]

I found out that we need to set the DISPLAY environment variable in the gui program.
How can I set it up?

[techcap]

I tested only on Console Application. Could you share the detail information for UI application?

[qqq-tech]

It is a common winform program with one text label(.NET 4.6)
and I run it on Raspberry Pi 3 B+.

I checked th same error from remote debugger when there was no DISPLAY environment in the ssh terminal.
so I want to test it by applying the DISPLAY environment.

[nub1604]

Today, I've got this problem too, but in a Display Environment.

Hardware

• Raspberry Pi 3 B+

Installed product versions

• Ubuntu Mate
• Visual Studio: 2017 community
• Extension: 1.5.2
• Remote Server: 1.4 - 1.5.2 (see workaround below)

Project Information

• WinForms Project

Exception on remote debugging:

Unhandled Exception:
System.TypeInitializationException: The type initializer for 'System.Windows.Forms.WindowsFormsSynchronizationContext' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Forms.ThemeEngine' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Forms.ThemeWin32Classic' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.KnownColors' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.GDIPlus' threw an exception. ---> System.DllNotFoundException: libc
at (wrapper managed-to-native) System.Drawing.GDIPlus.uname(intptr)
at System.Drawing.GDIPlus..cctor () [0x0006e] in <2bb3052119444fb7807d658e27511cb1>:0
--- End of inner exception stack trace ---
at System.Drawing.KnownColors..cctor () [0x0001a] in <2bb3052119444fb7807d658e27511cb1>:0
--- End of inner exception stack trace ---

Workaround
I've tried some older releases and I found that the Server Release 1.30 works fine in this case

[techcap]

I found reproducing step. It looks like the problem related to linux terminal or mono. I need to figure out.

[BryanCrotaz]

You can reproduce with

using System;

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

It can't find System.Native

mono 6.8.0.123 on Pi 3B
apt-get install mono-complete

[R10Rasmus]

I get "System.DllNotFoundException: libc..." if I remote debug my program on raspberry pi zero. I do not get this error when I run it local on the raspberry pi zero.

I get the error, when I use System.Device.Gpio functions, which needs libc installed.

[karpatidaniel]

I think I had similar issue:

MonoRemoteDebugger.Server v1.5.2
2022-01-24 20:47:56.1172|TRACE|MonoRemoteDebugger.SharedLib.Server.MonoUtils|Platform=Unix, GetMonoPath=mono, GetMonoXsp4=xsp4, GetPdb2MdbPath=pdb2mdb
Mono pdb to mdb debug symbol store converter
Usage: pdb2mdb assembly
2022-01-24 20:47:56.3011|TRACE|MonoRemoteDebugger.SharedLib.Server.MonoDebugServer|Start announcing
2022-01-24 20:47:56.4050|INFO|MonoRemoteDebugger.SharedLib.Server.MonoDebugServer|Waiting for client
2022-01-24 20:48:06.1496|INFO|MonoRemoteDebugger.SharedLib.Server.MonoDebugServer|Accepted client: ****:****
2022-01-24 20:48:06.1828|TRACE|MonoRemoteDebugger.SharedLib.Server.ClientSession|New Session from ****
2022-01-24 20:48:06.5476|INFO|MonoRemoteDebugger.SharedLib.Server.ClientSession|DebugLastContent-Message received
2022-01-24 20:48:06.5499|TRACE|MonoRemoteDebugger.SharedLib.Server.ClientSession|Check if content is already available from ****: /home/pi/MonoRemoteDebugger.Server/Temp/F8B93E30DFBF651B1499EA03ADF73919F3820CA9DAF20374DA24B92FBAA9A92D

Unhandled Exception:
System.TypeInitializationException: The type initializer for 'System.Windows.Forms.XplatUI' threw an exception. ---> System.DllNotFoundException: libc assembly:<unknown assembly> type:<unknown type> member:(null)
  at (wrapper managed-to-native) System.Windows.Forms.XplatUI.uname(intptr)
  at System.Windows.Forms.XplatUI..cctor () [0x0008e] in <6d635ac3dc1c4424ad385ded79f1e868>:0 
   --- End of inner exception stack trace ---
  at System.Windows.Forms.Application.EnableVisualStyles () [0x00006] in <6d635ac3dc1c4424ad385ded79f1e868>:0

Then I rolled back to version 1.3.0 and no issues further.