Oh yes, in fact, I did have JRE running self-made IRC-bot. My java -version: java version "1.5.0_06" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05) Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing) -- System freezes (responsive only to alt-sysrq) https://launchpad.net/bugs/62126