Fix bug in top_process.ex when complex args are in use

[Cgboal]

Hi,

I ran into a bug when spawning supervised tasks via Task.async_stream_nolink/6. When spawning tasks with MFA, the TopProcess GenServer will crash when trying to parse the spawned Tasks info if the args passed to it cannot be simply converted to a string during interpolation.

In my case, this occured when passing [[String.t()], map()], which resulted in the following error:

(ArgumentError) cannot convert the given list to a string.

To be converted to a string, a list must either be empty or only
contain the following elements:

  * strings
  * integers representing Unicode code points
  * a list containing one of these three elements

Please check the given list or call inspect/1 to get the list representation, got:

This fix simply adds an inspect call within the string interpolation which prevents this issue. I have tested this and it resolves the issue.

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❌ Cgboal
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[binaryseed]

Something else must be going wrong here. The a in $initial_call is set by Task and is the arity - it is always a number.

https://github.com/elixir-lang/elixir/blob/fb729784e5504f499b0179c4f154e73ea2a6f216/lib/elixir/lib/task/supervised.ex#L77-L85

Are you doing something manually with $initial_call?

[Cgboal]

Nope not doing anything manually with initial call:

    task_stream =
      Task.Supervisor.async_stream_nolink(
        XXXX.TaskSupervisor,
        batches,
        callback_module,
        :execute,
        [refined_context],
        max_concurrency: callback_module.max_concurrency(),
        timeout: :infinity
      )