id summary reporter owner description type status component version resolution keywords cc guest host 8685 Host & Guest freeze VB 4.0.4 Debian Squeeze SUN X2200 Marc N. Grotholtmann We did a lot of research here but we did not find any solution yet. We are using VirtualBox 4.0.4 on a SUN X2200 Server, 8GB RAM, 2x Opteron 2214 Dualcore, Debian Squeeze 6.0.1, 2x 250GB HDD Soft-Raid 1. Guest is Debian Squeeze, 512MB RAM, nothing special, started via VBoxHeadless. Host and guest freeze from time to time, reboot / hardware reset of the host is needed then. Usually we are using remote connection via SSH to connect to the host. When it freezes we sometimes can still access it from the console via ELOM. We then see a lot of headless processes, but they are not consuming much IO, RAM or CPU. We did not find anything special in the VBox logfiles yet. This happens since 4.x, with 3.x it was fine. Please help as this is blocking usage of VirtualBox for us. defect closed VMM/HWACCM VirtualBox 4.0.4 fixed Linux Linux