Where to find coredump on Azure App Service using Linux?

Question

I am using Azure App Service hosted on linux to use a.Net Core 6.0 app.

I have a null pointer error that is resulting in a segfault, that in turn is taking down the app service. I have had a few errors that result in segfaults so while I can fix the null pointer I really want to find why the container is crashing.

I can see the the following in AppServiceConsoleLogs :

/opt/startup/startup.sh: line 17: 65 Segmentation fault (core dumped) do.net xxx.dll

I am hoping if I can find the dumped core I might figure out the segmentation fault.

I have looked around the folders by going into the SSH console, but I cannot find anything that looks like memory dump.

Answer 1

Where to find coredump on Azure App Service using Linux?

I have deployed the .NET Core 6 App to Azure App service.

• Navigate to Azure portal => your Deployed App Service => Advanced Tools => Go .

• Click on - Site wwwroot .

• Deployed files will be compiled into dll files .

Click on the file, you can see the content.

• We can also check the files in Bash .
• In Bash , Navigate to the Application root directory and run ls .You can see the deployed files.

• In Configuration section => General Settings , check the startup command.
• It has to be

dotnet YourAppName.dll

• Make sure the dll is available in Bash or SSH .

Update:

We can find the core dumps in LogFiles/core folder. But initially, it is disabled. To enable it, we need to add the below command in Startup of the deployed app service.

ulimit -c unlimited

Thanks @ Sourabh Edake for the command.

• Restart the app. Whenever there is an exception, the core dump will be created in the mentioned LogFiles/core folder.