'can't be called from trap context'-Error when a INT-signal is sent with Ruby >= 2.0.0

[philkman]

If a Sig-Int is sent to the Worker-Dispatcher under Ruby >= 2.0.0, Ruby reports a 'can't be called from trap context'-Error.
It seems, that Ruby 2.0 tries to be more thread-safe and raise an exception, if something is called which could cause a deadlock.

The workaround could be, putting the problematic code (like writing to a DB or to a Log-File) inside a new thread.