Stack Overflow .NET 9 Response Compression when builder wrapper references IConfiguration/AppSettings

[gilm0079]

Description

I've been working on upgrading a Blazor 7 wasm app to Blazor 9 web app. I came across a problem deploying the Blazor 9 app to IIS. The worker process would start for a few seconds then terminate with no http response. The issue only showed up when deploying from VS 2022 using the release build. If I deployed as a debug build the site would come up. Event Viewer didn't give much to go on for specifically what the error was except that the coreclr.dll was terminating. I turned on stdout in the web.config and the stack trace shows a stack overflow in relation to using the UseResponseCompression Middleware. What is odd is that the default usage of UseResponseCompression works, but if I want the usage to be controlled by a boolean in the appSettings by wrapping UseResponseCompression in a utility that reads the boolean from appSettings using IConfiguration it causes a stack overflow with the middleware. I'm attaching the stdout I see when using a wrapper for UseResponseCompression. I'll include the Service collection setup and the differences between the builder implementations in the reproduction steps. There wasn't an issue with this in .NET 7 so I'm not sure if the behavior changed in .NET 8 or 9.

stdout_20250130212257_22228.log

Reproduction Steps

AppSettings.json snippet

"Compression": {
  "Enabled": false,
  "MimeTypes": [
    "text/plain",
    "text/plain; charset=utf-8",
    "application/json",
    "image/svg+xml",
    "application/octet-stream"
  ]
},

Service Collection Setup

public static void ConfigureCompression(this IHostApplicationBuilder builder) {
    AppSettingsModel? appSettings = builder.Configuration.Get<AppSettingsModel>();
    if (appSettings == null) throw new ArgumentNullException("ConfigureCompression failed to find appSettings");

    if (appSettings.Compression.Enabled) {
        System.IO.Compression.CompressionLevel compressionLevel = System.IO.Compression.CompressionLevel.Fastest; //default to fastest compression
        if (Enum.TryParse<System.IO.Compression.CompressionLevel>(appSettings.Compression.Level.ToString(), out var parsedLevel)) {
            compressionLevel = parsedLevel;
        }
        builder.Services.Configure<GzipCompressionProviderOptions>(options => options.Level = compressionLevel);
        builder.Services.Configure<BrotliCompressionProviderOptions>(options => options.Level = compressionLevel);

        if (appSettings.Compression.MimeTypes.NotNullAndHasOneOrMoreItems()) {
            builder.Services.AddResponseCompression(options => {
                options.EnableForHttps = true;
                options.Providers.Add<GzipCompressionProvider>();
                options.Providers.Add<BrotliCompressionProvider>();
                options.MimeTypes =
                    ResponseCompressionDefaults.MimeTypes.Concat(appSettings.Compression.MimeTypes.ToArray());
            });
        } else {
            builder.Services.AddResponseCompression(options => {
                options.EnableForHttps = true;
                options.Providers.Add<GzipCompressionProvider>();
                options.Providers.Add<BrotliCompressionProvider>();
            });
        }
    }
}

Application Builder usage

public static void UseResponseCompression(this IApplicationBuilder app) {
    var configuration = app.ApplicationServices.GetRequiredService<IConfiguration>();
    AppSettingsModel? appSettings = configuration.GetSection("AppSettings").Get<AppSettingsModel>();
    if (appSettings == null) throw new ArgumentNullException("Startup.UseResponseCompression failed to find appSettings");

    if (appSettings.Compression.Enabled) {
        app.UseResponseCompression();
    }
}

Expected behavior

not throw an exception when using response compression

Actual behavior

The app pool terminates after a few seconds. The stdout from the app pool worker process is in the attachment

Regression?

This was working in .NET 7. I'm not sure if .NET 8 was an issue. Our code migration went from Blazor 7 -> 9. We did intermediate changes to .NET 8 due to blazor breaking changes, but then just continued on to 9.

Known Workarounds

comment out our utility wrapper for UseResponseCompression builder extension usage in Program.cs or use built in aspnetcore UseResponseCompression without accessing appSettings via IConfiguration to determine if the compression middleware should be loaded.

Configuration

Blazor 9 web app w/ server/client/shared project structure
Deployed via MSDeploy to On-prem IIS server (v10.0.20348.1 - Win Server 2022 21H2)
App Pool - No Managed Code - Default App Pool Identity
Built in VS 2022 Pro with .NET 9.0.102 x64 (9.1.224.61103)
Tried chrome from Win10 Pro x64 22H2, also tried from chrome on hosting server

Other information

dotnet --info output

C:\WINDOWS\system32>dotnet --info
.NET SDK:
 Version:           9.0.102
 Commit:            cb83cd4923
 Workload version:  9.0.100-manifests.4a54b1a6
 MSBuild version:   17.12.18+ed8c6aec5

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19045
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\9.0.102\

.NET workloads installed:
 [wasm-tools]
   Installation Source: VS 17.12.35707.178
   Manifest Version:    9.0.1/9.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\9.0.100\microsoft.net.workload.mono.toolchain.current\9.0.1\WorkloadManifest.json
   Install Type:              Msi

 [aspire]
   Installation Source: VS 17.12.35707.178
   Manifest Version:    8.2.2/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.aspire\8.2.2\WorkloadManifest.json
   Install Type:              Msi

Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.1
  Architecture: x64
  Commit:       c8acea2262

.NET SDKs installed:
  2.1.526 [C:\Program Files\dotnet\sdk]
  2.2.207 [C:\Program Files\dotnet\sdk]
  3.1.402 [C:\Program Files\dotnet\sdk]
  3.1.426 [C:\Program Files\dotnet\sdk]
  5.0.101 [C:\Program Files\dotnet\sdk]
  5.0.203 [C:\Program Files\dotnet\sdk]
  6.0.101 [C:\Program Files\dotnet\sdk]
  6.0.200 [C:\Program Files\dotnet\sdk]
  6.0.202 [C:\Program Files\dotnet\sdk]
  7.0.317 [C:\Program Files\dotnet\sdk]
  9.0.102 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.22 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.22 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.24 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.22 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.26 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.24 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.24 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  arm64 [C:\Program Files\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\arm64\InstallLocation]
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

[pinkfloydx33]

You're calling app.UseResponseCompression from within a function with the same signature, it's calling itself and hence a stackoverflow

[gilm0079]

That was it. Thanks. Something must have been changed here from our .net7 app. Explicitly referencing the microsoft namespace fixed it. Brain dead from this migration.