I have a client with a brand new install (120+) users running on VMware v6.5, everything has been going well until recently the CPU in the VM spikes to 100% utilization and stays there. Of course this knocks all of the users off the system. This has happened twice this week around the same time frame each both days. I see this CRON job kick off several times prior to the CPU spike: CRON: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1) Any ideas what that CRON is doing? When the CPU locks up this is what the log file shows that sticks out: "NULNULNULNULNULNULNULNULNULNULNUL" this repeats about (50) more times... I don't see anything obvious in the log files. Has anyone else see anything like this? Or is this more of a Debian OS issue? Generally the CPU hovers around 3-5% utilization and there is 4G of RAM with roughly 20% utilization there. I have other clients running the same basic config with no issues. Any and all help and feedback much appreciated.