We are using Actors from Celluloid.

Somehow, a program of ours has a hard time compacting an Array. (I.e. using it after we'd mapped over it, while deleting items in it.)

This crash comes when we use 'finalizers' from Celluloid. Here is the relevant file (in the version we use) for that feature:

https://github.com/celluloid/celluloid/blob/0-15-stable/lib/celluloid/actor.rb

Also: putsing the Array, also crashed JRuby.

A backtrace of running a Celluloid program on JRuby 1.7.21 and on 9.0.0.0.rc2 and on master (0f616f984ba51ccd4d8ddafc53dd8dab93b4e5dc)

snippet.rb that tries to show what we do.

Update: See comment below for reproduce case.