If your Elixir application hangs, it could be due to deadlocks or infinite loops. Use debugging tools like `Observer` or `IEx` to inspect processes and their states, and check for any blocking operations that may be causing the hang.

When your Elixir application hangs, it can be quite frustrating, and diagnosing the underlying issue is crucial for restoring normal operation. One common reason for an application to hang is the presence of deadlocks, where two or more processes are waiting indefinitely for each other to release resources. This can happen if processes are not designed to handle concurrent interactions properly. To investigate this, you can utilize debugging tools such as Observer, which provides a graphical interface to visualize processes, their states, and their interactions. By examining the process tree and checking for processes in a blocked state, you can identify potential deadlocks. Another possible cause of hanging is an infinite loop within your code, which can occur if recursion is not properly managed or if a process is continuously sending messages without an exit condition. In such cases, review your code for any loops or recursive function calls that may not terminate as expected. Additionally, you can use the interactive Elixir shell (IEx) to inspect the state of processes and run diagnostic commands. For example, you can call Process.list() to view all running processes and check for any that seem to be consuming an excessive amount of resources. By combining these debugging techniques, you can pinpoint the cause of your application's hang and take appropriate action to resolve it.