> The only thing I can think off is that your participant possibly relies on 
> some IO object that got opened BEFORE daemonizing, and is no longer 
> available after daemonization...
>

Thank you, that was it!

Just before forking I now checked all open IO objects using:
  ObjectSpace.each_object(IO) { |f| puts f unless f.closed? }

and found out that the logger class I'm using holds the handle to it's log 
in a class variable. Using Thread.abort_on_exception = true as you 
suggested I can now see the process terminate with a uninitialized stream 
exception.

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