How to handle errors from child process?

[tarasMatskovich]

I get following error: Communication with process stopped unexpectedly when listening $pool->on('error), but i do not know where in my child process error occures - how can i handle such errors?

[WyriHaximus]

So this error only happens when there are outstanding calls to a child process and the process closes before they have been handled. This only happens during a fatal error, or when the process gets OOM killed.