Supervision and Magically Reincarnated Processes

Chandrashekhar Mullaparthi <>
Mon Dec 16 09:38:15 CET 2002

Do you have sasl running? If so you should get crash reports you can look at
using rb. If you want to find out the reason without changing anything, us
the sys:trace function on your supervisor, you should see the EXIT message
from the supervised child...


-----Original Message-----
From: Bruce Fitzsimons [mailto:]
Sent: 16 December 2002 08:18
Subject: Q: Supervision and Magically Reincarnated Processes

Hi peoples,

A quick OTP question, I'm using supervisors in my Aplio (Internet Phone)
server program and I've carefully inserted a bug somewhere that makes one of
the processes crash. But I don't get any output about why it has crashed in
the error_logger or shell (when I run it that way).

The process that dies is a gen_server (behaviour) and it doesn't execute its
terminate(Reason, State) so I guess its just 'EXIT'ing somewhere.

My question is: how can I trap this (preferably sans debugger)?

The supervisor restarts it happily, and works so fast and well that I wasn't
even aware it was dying until I started running it in the shell this week.


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