Hi Francois, How recent is that kernel you are trying to boot? I think there was a fix for the MP code in this commit, however I'm not sure whether it is related or not: http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/bb467734fc407e2c2de7f8314c63dd9f708f4df4 Cheers, Antonio Huete