jenkinsci/dynamic-axis-plugin — pull request #3 by or-shahcar (2014-08-28 16:54:00+00:00)
Title: [JENKINS-22652] ConcurrentModificationException when Matrix project with...

rebuild method should return final List and not changeable one.
When using multi-configuration concurrently the old way can cause concurrency issue, if list is changed while other thread is iterating over it.