`ReadAsync` hangs for specific executable

[michael-wolfenden]

Version(s)

v13.0.0

To reproduce

I'm trying to extract a version number from the openapi-changes cli tool.

The specific executable is available at:
https://github.com/pb33f/openapi-changes/releases/download/v0.2.1/openapi-changes_0.2.1_windows_x86_64.tar.gz

Calling openapi-changes.exe from the console works successfully

> .\openapi-changes.exe

@@@@@@@   @@@@@@@   @@@@@@   @@@@@@   @@@@@@@@
@@@@@@@@  @@@@@@@@  @@@@@@@  @@@@@@@  @@@@@@@@
@@!  @@@  @@!  @@@      @@@      @@@  @@!
!@!  @!@  !@   @!@      @!@      @!@  !@!
@!@@!@!   @!@!@!@   @!@!!@   @!@!!@   @!!!:!
!!@!!!    !!!@!!!!  !!@!@!   !!@!@!   !!!!!:
!!:       !!:  !!!      !!:      !!:  !!:
:!:       :!:  !:!      :!:      :!:  :!:
 ::        :: ::::  :: ::::  :: ::::   ::
 :        :: : ::    : : :    : : :    :

https://pb33f.io/openapi-changes/
------------------------------------
openapi-changes version: 0.2.1 | compiled: Sat, 11 Apr 2026 14:40:48 UTC

Current commands

  > console
  > summary
  > report
  > markdown-report
  > html-report

For more help, use the --help flag with any command.

However, the following script hangs

#:package SimpleExec@13.0.0

using static SimpleExec.Command;

var (standardOutput1, _) = await ReadAsync(@"C:\temp\openapi-changes.exe");

Console.WriteLine(standardOutput1);

Expected behaviour

ReadAsync to not hang and return stdOut

Actual behaviour

ReadAsync hangs

Workarounds

N/A

Additional context

After some debugging, it looks like the process never fires the Exited event.

This script works however

using System.Diagnostics;

var psi = new ProcessStartInfo(@"C:\temp\openapi-changes.exe")
{
    RedirectStandardOutput = true,
    RedirectStandardError = true,
    UseShellExecute = false,
};

using var process = new Process { StartInfo = psi };
process.Start();

var stdoutTask = process.StandardOutput.ReadToEndAsync();

await process.WaitForExitAsync();

string stdout = await stdoutTask;

Console.WriteLine(stdout);

> dotnet .\dump-output.cs

@@@@@@@   @@@@@@@   @@@@@@   @@@@@@   @@@@@@@@
@@@@@@@@  @@@@@@@@  @@@@@@@  @@@@@@@  @@@@@@@@
@@!  @@@  @@!  @@@      @@@      @@@  @@!
!@!  @!@  !@   @!@      @!@      @!@  !@!
@!@@!@!   @!@!@!@   @!@!!@   @!@!!@   @!!!:!
!!@!!!    !!!@!!!!  !!@!@!   !!@!@!   !!!!!:
!!:       !!:  !!!      !!:      !!:  !!:
:!:       :!:  !:!      :!:      :!:  :!:
 ::        :: ::::  :: ::::  :: ::::   ::
 :        :: : ::    : : :    : : :    :

https://pb33f.io/openapi-changes/
------------------------------------
openapi-changes version: 0.2.1 | compiled: Sat, 11 Apr 2026 14:40:48 UTC

Current commands

  > console
  > summary
  > report
  > markdown-report
  > html-report

For more help, use the --help flag with any command.

I'm not sure if the issue is with this specific executable or the SimpleExec library itself