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Process.Start() and PowerShell Start-Process hang on newer mcr.microsoft.com/windows/servercore:ltsc2019 / .NET Framework 4.8 LTSC2019 images

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
48/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
docker, powershell
领域
devops, infrastructure, operating-systems

调研方向

使用已知正常和失败的 Server Core 映像运行最小 PowerShell 和 .NET 复现，并比较 10.0.17763.8880 和 10.0.17763.9020 两条版本线。检查更新后的 LTSC2019 映像中的进程创建行为是否发生了变化；完成的标准是识别出回归问题，或确认文档中所述的固定映像 workaround。

由索引模型根据 Issue 内容生成。

描述

bug triage
Description of the bug

We are seeing a regression in newer Windows Server Core LTSC 2019 container images.

Starting a child process from inside the container hangs indefinitely. This affects both:

  • .NET System.Diagnostics.Process.Start()
  • PowerShell Start-Process

This used to work a few weeks ago and still works on an older pinned .NET Framework SDK image.

Known-good image

The following images still works correctly:

  • mcr.microsoft.com/dotnet/framework/sdk:4.8-20260512-windowsservercore-ltsc2019
  • mcr.microsoft.com/windows/servercore:10.0.17763.8880

On this image, both:

  • .NET Process.Start()
  • PowerShell Start-Process

return normally.

Regressed images

The problem occurs on newer images based on updated LTSC2019 Server Core, including:

  • mcr.microsoft.com/windows/servercore:ltsc2019
  • current floating mcr.microsoft.com/dotnet/framework/sdk:4.8
  • current floating mcr.microsoft.com/dotnet/framework/sdk:4.8-windowsservercore-ltsc2019
Expected behavior

Starting cmd.exe /c echo hello should return immediately.

Expected output for the .NET repro:

Before
After

Expected output for the PowerShell repro:

Before
After
Actual behavior

The process-start call hangs indefinitely.

For the .NET repro, output is:

Before

and Process.Start() never returns.

For the PowerShell repro, output is:

Before

and Start-Process never returns.

Container OS versions observed

Known-good older image lineage:

  • 10.0.17763.8880

Failing newer image lineage:

  • 10.0.17763.9020
Minimal PowerShell repro

Run:

docker run -ti --rm mcr.microsoft.com/windows/servercore:ltsc2019 powershell

Inside the container:

Write-Host "Before"
Start-Process cmd.exe -ArgumentList '/c echo hello' -Wait
Write-Host "After"

Actual result on the failing image:

Before

and then it hangs.

Minimal .NET repro

Run:

docker run -ti --rm mcr.microsoft.com/windows/servercore:ltsc2019 powershell

Inside the container:

Add-Type @"
using System;
using System.Diagnostics;

public class Test {
    public static void Run() {
        var p = new Process();
        p.StartInfo.FileName = "cmd.exe";
        p.StartInfo.Arguments = "/c echo hello";
        Console.WriteLine("Before");
        p.Start();
        Console.WriteLine("After");
    }
}
"@

[Test]::Run()

Actual result on the failing image:

Before

and then it hangs.

Notes
  • This does not appear to be specific to .NET Framework, because the same behavior is reproducible on plain mcr.microsoft.com/windows/servercore:ltsc2019.
  • The regression appears to have been introduced after the 2026-05-12 .NET Framework SDK LTSC2019 image.
  • We are currently pinning to mcr.microsoft.com/dotnet/framework/sdk:4.8-20260512-windowsservercore-ltsc2019 as a temporary workaround.
Environment
  • Host OS: Windows Server 2019
  • Container base: mcr.microsoft.com/windows/servercore:ltsc2019
  • Affected higher-level image: mcr.microsoft.com/dotnet/framework/sdk:4.8
  • Working higher-level image: mcr.microsoft.com/windows/servercore:10.0.17763.8880
Question

Is this a known regression in the updated LTSC2019 Server Core image, or an intentional change in process creation behavior inside Windows containers?

主要语言
PowerShell
星标
551
派生
76
30 天内没有已合并 PR

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