forkpty() / execvpe() causing Segmentation fault under Ubuntu Linux 22.04.1 LTS (.Net 7.0.3) #32
Description
Entry call:
using System.Collections.Generic;
using System;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using Pty.Net;
namespace TestApp
{
internal class Application
{
static void Main(string[] args)
{
var app = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? Path.Combine(Environment.SystemDirectory, "cmd.exe") : "sh";
var options = new PtyOptions
{
Name = "Custom terminal",
Cols = 80,
Rows = 25,
Cwd = Environment.CurrentDirectory,
App = app,
Environment = new Dictionary<string, string>()
{
{ "FOO", "bar" },
{ "Bazz", string.Empty },
},
};
PtyProvider.SpawnAsync(options, new CancellationToken());
Task.Delay(-1).Wait();
}
}
}
Segmentation fault happened calling forkpty() / execvpe()
Pty.Net\Linux\PtyProvider.cs
int controller = 0;
int pid = forkpty(ref controller, null, ref term, ref winSize);
if (pid == -1)
{
throw new InvalidOperationException($"forkpty(4) failed with error {Marshal.GetLastWin32Error()}");
}
if (pid == 0)
{
// We are in a forked process! See http://man7.org/linux/man-pages/man2/fork.2.html for details.
// Only our thread is running. We inherited open file descriptors and get a copy of the parent process memory.
Environment.CurrentDirectory = options.Cwd;
execvpe(options.App, terminalArgs, options.Environment);
// Unreachable code after execvpe()
}
**
I have tested for .Net 6, it works.
Wonding whether it related to the large VSZ (Virtual Memory Size) on .Net 7 / .Net 8 which lead to forking
Segmentation fault issue.
**
NetSDK: .Net 7.0.3
Application Type: Console
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS x64
Release: 22.04
Codename: jammy
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