app throws exception on cold start (deployed on azure function)

Version

4.13.2

Describe the bug

Deployed on azure functions consumption plan, throws exception on cold start, but works when restarted from azure portal

To Reproduce

Steps to reproduce the behavior:

1. When we restart function app from azure portal console, it works
2. But after some time, when we invoke the function by sending an http request to messages endpoint, it fails with an exception

Expected behavior

It should execute the function after cold start, as it does when restarted from portal console

Additional context

This might look as a azure functions related issue and I should file the issue there (I have filed it there as well). But I thought that adding singleton services of middlewares (ShowTypingMiddleware) might have played the role in this exception, and hence filing here

Related information

• Programming language used : c#

The exception thrown indicates that this is a DI issue. So providing my startup code and the exception

Source

public class Startup : FunctionsStartup {
    public override void Configure(IFunctionsHostBuilder builder) {
      builder.Services.AddBotRuntime(builder.GetContext().Configuration);

      builder.Services
                .AddSingleton<IMiddleware>((s) => new ShowTypingMiddleware(delay: 500));
      var memoryStorage = new MemoryStorage();
      var inspectionState = new InspectionState(memoryStorage);
      var userState = new UserState(memoryStorage);
      var conversationState = new ConversationState(memoryStorage);
      builder.Services
                .AddSingleton<IMiddleware>((s) => new InspectionMiddleware(inspectionState, userState, conversationState));
    }

    public override void ConfigureAppConfiguration(IFunctionsConfigurationBuilder configurationBuilder) {
      FunctionsHostBuilderContext context = configurationBuilder.GetContext();

      string applicationRoot = context.ApplicationRootPath;
      string environmentName = context.EnvironmentName;
      string settingsDirectory = "settings";

      configurationBuilder.ConfigurationBuilder.AddBotRuntimeConfiguration(
          applicationRoot,
          settingsDirectory,
          environmentName);
    }
  }

The exception thrown is:

2021-06-17T10:56:29.944 [Error] Executed 'messages' (Failed, Id=dcaee1ff-d8c1-43e8-af85-fba28541c495, Duration=2ms)System.NullReferenceException : Object reference not set to an instance of an object.at System.Linq.Expressions.Interpreter.CastInstruction.CastInstructionT`1.Run(InterpretedFrame frame)at System.Linq.Expressions.Interpreter.Interpreter.Run(InterpretedFrame frame)at System.Linq.Expressions.Interpreter.LightLambda.Run(Object[] arguments)at Thunk(Func`2 ,IResolverContext )at DryIoc.Factory.<>c__DisplayClass26_0.<ApplyReuse>b__2() at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6605at DryIoc.Scope.TryGetOrAdd(ImMap`1 items,Int32 id,CreateScopedValue createValue,Int32 disposalOrder) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7849at DryIoc.Scope.GetOrAdd(Int32 id,CreateScopedValue createValue,Int32 disposalOrder) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7834at DryIoc.Factory.ApplyReuse(Expression serviceExpr,Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6604at DryIoc.Factory.GetExpressionOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6564at DryIoc.WrappersSupport.GetArrayExpression(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 2903at DryIoc.ExpressionFactory.CreateExpressionOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7699at DryIoc.Factory.GetExpressionOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6554at DryIoc.ReflectionFactory.CreateExpressionOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7083at DryIoc.Factory.GetExpressionOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6554at DryIoc.Factory.GetDelegateOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6634at DryIoc.Container.ResolveAndCacheDefaultFactoryDelegate(Type serviceType,IfUnresolved ifUnresolved) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 211at DryIoc.Container.DryIoc.IResolver.Resolve(Type serviceType,IfUnresolved ifUnresolved) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 196at Microsoft.Azure.WebJobs.Script.WebHost.DependencyInjection.JobHostServiceProvider.GetService(Type serviceType,IfUnresolved ifUnresolved) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\JobHostServiceProvider.cs : 99at Microsoft.Azure.WebJobs.Script.WebHost.DependencyInjection.JobHostServiceProvider.GetRequiredService(Type serviceType) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\JobHostServiceProvider.cs : 82at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider,Type serviceType)at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)at Microsoft.Bot.Builder.Dialogs.Adaptive.Runtime.Extensions.ServiceCollectionExtensions.<>c.<AddBotRuntime>b__0_0(IServiceProvider sp)at DryIoc.Microsoft.DependencyInjection.DryIocAdapter.<>c__DisplayClass3_0.<RegisterDescriptor>b__0(IResolverContext r) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\DryIocAdapter.cs : 156at DryIoc.Registrator.<>c__DisplayClass27_0.<RegisterDelegate>b__0(IResolverContext r) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 4550at System.Linq.Expressions.Interpreter.FuncCallInstruction`3.Run(InterpretedFrame frame)at System.Linq.Expressions.Interpreter.Interpreter.Run(InterpretedFrame frame)at System.Linq.Expressions.Interpreter.LightLambda.Run(Object[] arguments)at Thunk(Func`2 ,IResolverContext )at DryIoc.Factory.<>c__DisplayClass26_0.<ApplyReuse>b__2() at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6605at DryIoc.Scope.TryGetOrAdd(ImMap`1 items,Int32 id,CreateScopedValue createValue,Int32 disposalOrder) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7849at DryIoc.Scope.GetOrAdd(Int32 id,CreateScopedValue createValue,Int32 disposalOrder) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7834at DryIoc.Factory.ApplyReuse(Expression serviceExpr,Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6604at DryIoc.Factory.GetExpressionOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6564at DryIoc.Factory.GetDelegateOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 6634at DryIoc.DelegateFactory.GetDelegateOrDefault(Request request) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 7740at DryIoc.Container.DryIoc.IResolver.Resolve(Type serviceType,Object serviceKey,IfUnresolved ifUnresolved,Type requiredServiceType,Request preResolveParent,Object[] args) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 291at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw(Exception source)at System.Linq.Expressions.Interpreter.ExceptionHelpers.UnwrapAndRethrow(TargetInvocationException exception)at System.Linq.Expressions.Interpreter.MethodInfoCallInstruction.Run(InterpretedFrame frame)at System.Linq.Expressions.Interpreter.Interpreter.Run(InterpretedFrame frame)at System.Linq.Expressions.Interpreter.LightLambda.Run(Object[] arguments)at Thunk(Func`2 ,IResolverContext )at DryIoc.Container.ResolveAndCacheDefaultFactoryDelegate(Type serviceType,IfUnresolved ifUnresolved) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 225at DryIoc.Container.DryIoc.IResolver.Resolve(Type serviceType,IfUnresolved ifUnresolved) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\DryIoc\Container.cs : 196at Microsoft.Azure.WebJobs.Script.WebHost.DependencyInjection.ScopedServiceProvider.GetService(Type serviceType) at D:\a\1\s\src\WebJobs.Script.WebHost\DependencyInjection\ScopedServiceProvider.cs : 25at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp,Type type,Type requiredBy,Boolean isDefaultParameterRequired)at lambda_method(Closure ,IServiceProvider ,Object[] )at Microsoft.Azure.WebJobs.Host.Executors.DefaultJobActivator.CreateInstance[T](IServiceProvider serviceProvider) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\DefaultJobActivator.cs : 42at Microsoft.Azure.WebJobs.Host.Executors.DefaultJobActivator.CreateInstance[T](IFunctionInstanceEx functionInstance) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\DefaultJobActivator.cs : 32at Microsoft.Azure.WebJobs.Host.Executors.ActivatorInstanceFactory`1.<>c__DisplayClass1_1.<.ctor>b__0(IFunctionInstanceEx i) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ActivatorInstanceFactory.cs : 20at Microsoft.Azure.WebJobs.Host.Executors.ActivatorInstanceFactory`1.Create(IFunctionInstanceEx functionInstance) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ActivatorInstanceFactory.cs : 26at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.CreateInstance(IFunctionInstanceEx functionInstance) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionInvoker.cs : 44at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ParameterHelper.Initialize() at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs : 759at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsync(IFunctionInstance functionInstance,CancellationToken cancellationToken) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs : 90

[peterinnesmsft]

@taicchoumsft I’m in the process of reaching out to the Azure Functions team to try and find the right contact that can help provide guidance and next steps in terms of a formal resolution within the runtime itself. I’ll provide an update once I have an answer.

[axelsrz]

Closing due to inactivity. If problem persists please open a new issue.