Out of Memory exception on a function app hosted in Azure

Question

Out of Memory exception on a function app hosted in Azure

Newbie Dev 156

Hi,
I have an azure Function(v4,.net6), which occasionally shows the below error.

System.OutOfMemoryException:  
   at System.Reflection.Emit.DynamicMethod.CreateDelegate (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=****)  
   at lambda_method459 (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)  
   at DryIoc.Scope.TryGetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7849)  
   at DryIoc.Scope.GetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7834)  
   at lambda_method458 (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)  
   at DryIoc.Scope.TryGetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7849)  
   at DryIoc.Scope.GetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7834)  
   at lambda_method457 (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)  
   at DryIoc.Scope.TryGetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7849)  
   at DryIoc.Scope.GetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7834)  
   at lambda_method456 (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)  
   at DryIoc.Scope.TryGetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7849)  
   at DryIoc.Scope.GetOrAdd (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:7834)  
   at lambda_method455 (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)  
   at DryIoc.Container.ResolveAndCacheDefaultFactoryDelegate (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:224)  
   at DryIoc.Container.DryIoc.IResolver.Resolve (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/DryIoc/Container.cs:195)  
   at Microsoft.Azure.WebJobs.Script.WebHost.DependencyInjection.ScopedServiceProvider.GetService (Microsoft.Azure.WebJobs.Script.WebHost, Version=4.13.0.0, Culture=neutral, PublicKeyToken=null: /_/src/WebJobs.Script.WebHost/DependencyInjection/ScopedServiceProvider.cs:25)  
   at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService (Microsoft.Extensions.DependencyInjection.Abstractions, Version=6.0.0.0, Culture=neutral, PublicKeyToken=****)  
   at lambda_method371 (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null)  
   at Microsoft.Azure.WebJobs.Host.Executors.DefaultJobActivator.CreateInstance (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\DefaultJobActivator.cs:42)  
   at Microsoft.Azure.WebJobs.Host.Executors.DefaultJobActivator.CreateInstance (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\DefaultJobActivator.cs:31)  
   at Microsoft.Azure.WebJobs.Host.Executors.ActivatorInstanceFactory`1+<>c__DisplayClass1_1.<.ctor>b__0 (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ActivatorInstanceFactory.cs:20)  
   at Microsoft.Azure.WebJobs.Host.Executors.ActivatorInstanceFactory`1.Create (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ActivatorInstanceFactory.cs:25)  
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.CreateInstance (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionInvoker.cs:44)  
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+ParameterHelper.Initialize (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:791)  
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<TryExecuteAsync>d__18.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.34.0, Culture=neutral, PublicKeyToken=****: C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:104)

Not sure if this is related, but the Function app uses GraphServiceClient class (Graph API). The class does not have an interface, so I have created an interface which implements the creation of the service client. The interface is registered as scoped.

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Answer 1

MughundhanRaveendran-MSFT 12,511

Hi @Newbie Dev ,

Please check if the below post helps in resolving the issue.

https://learn.microsoft.com/en-us/answers/questions/931451/function-app-gives-outofmemory-error.html?childToView=932016#answer-932016

Feel free to reach out to me if you have any questions.

Newbie Dev 156 Reputation points

2022-10-21T09:47:56.76+00:00

Hi @MughundhanRaveendran-MSFT , thanks for your reply. I am not quite sure how to check the memory usage of the app in my local machine.
But just to stress, this out of memory issue occurs only occasionally. The average memory working set of the app is below 100MB(occasionally goes above 100, but less than 200MB). I guess this would be normal for an app?

Also I did a bit more digging in to the Function App. Not sure if related but I can see the Data In is occasionally spiking and at those times I cannot see any logs in App Insights. But the logs appear after a few minutes saying the app is restarting.

Now I am not sure why the Data In has spikes and why the app is restarting when there is a spike.
MughundhanRaveendran-MSFT 12,511 Reputation points

2022-10-27T08:52:46.06+00:00

@Newbie Dev , Seems the behavior is normal. If you would like to look at the memory usage on your local machine, you can look at the task manager for the func.exe process or you can install the VMmap tool

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Out of Memory exception on a function app hosted in Azure

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