Hit inotify user limit on linux when you start and stop hosts created with Host.CreateDefaultBuilder(args) in a tight loop #63540
Description
Description
Starting and Stopping a generic host created with Host.CreateDefaultBuilder(args) in a tight loop can cause inotify limit exception.
Reproduction Steps
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;
namespace App
{
public class Program
{
public static async Task Main(string[] args)
{
for (var i = 0; i < 100; i++)
{
using var host = await Host.CreateDefaultBuilder(args).StartAsync();
await host.StopAsync();
}
}
}
}Expected behavior
JsonConfigurationProvider is disposed when the host is stopped and disposed.
Actual behavior
Unhandled exception. System.IO.IOException: The configured user limit (128) on the number of inotify instances has been reached, or the per-process limit on the number of open file descriptors has been reached.
at System.IO.FileSystemWatcher.StartRaisingEvents()
at System.IO.FileSystemWatcher.StartRaisingEventsIfNotDisposed()
at System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value)
at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.TryEnableFileSystemWatcher()
at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.CreateFileChangeToken(String filter)
at Microsoft.Extensions.FileProviders.PhysicalFileProvider.Watch(String filter)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.<.ctor>b__1_0()
at Microsoft.Extensions.Primitives.ChangeToken.OnChange(Func`1 changeTokenProducer, Action changeTokenConsumer)
at Microsoft.Extensions.Configuration.FileConfigurationProvider..ctor(FileConfigurationSource source)
at Microsoft.Extensions.Configuration.Json.JsonConfigurationSource.Build(IConfigurationBuilder builder)
at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
at Microsoft.Extensions.Hosting.HostBuilder.BuildAppConfiguration()
at Microsoft.Extensions.Hosting.HostBuilder.Build()
at Microsoft.Extensions.Hosting.HostingAbstractionsHostBuilderExtensions.StartAsync(IHostBuilder hostBuilder, CancellationToken cancellationToken)
at WebApplication1.Program.Main(String[] args) in /home/foriequal0/workspace/nk-backend/Library/WebApplication1/Program.cs:line 12
at WebApplication1.Program.<Main>(String[] args)
Process finished with exit code 134.
Regression?
No response
Known Workarounds
Dispose manually file providers
using var host = await Host.CreateDefaultBuilder(args).StartAsync();
await host.StopAsync();
var configuration = host.Services.GetService<IConfiguration>() as ConfigurationRoot;
foreach (var provider in configuration?.Providers?.OfType<FileConfigurationProvider>() ?? Array.Empty<FileConfigurationProvider>())
{
(provider.Source.FileProvider as IDisposable)?.Dispose();
}Configuration
Ubuntu 21.10, .NET 6
Other information
No response