Please find description here : https://groups.google.com/forum/#!topic/lucee/J7ptsXDhQek
I can rewrite the bug description here if really necessary but I'm currently out of time.
The bug is a blocker for me because I need to rely on a cfthread which will join with other cfthread's from the same page. My current workaround is not sure at 100% (not deterministic).
In attachment I add a bug.cfm file for testing and help to understand the issue.
Linux (Ubuntu 14.04LTS)