id summary reporter owner description type status component version resolution keywords cc guest host 7313 "4-CPU debian 5.0 guest gives: ""BUG: soft lockup - CPU#[n] stuck for 61s - [procname:procid]""" Nick J "Host is 64 bit Ubuntu 10.04, running VirtualBox 3.2.8. Guest is Debian 5.0, 64 bit. Guest was set up with 1 CPU, but since my host has a Quad Intel processor, I decided to try increasing it to 4 CPUs on the guest. Running with 4 CPUs gave errors like ""BUG: soft lockup - CPU#[n] stuck for 61s - [procname:procid]"" on the guest's console (will attach screenshot of this shortly), which doesn't sound like it can be a good thing. I then ran unixbench on the guest, and whilst this was running, the guest hung, and had to be forcibly shutdown. I then brought the number of CPUs down from 4 to 2, and re-ran unixbench. The ""BUG: soft lockup"" messages were gone, and the VirtualBox did not hang. So, there seems to be a problem with 4 CPUs, at least for me, that causes ""BUG: soft lockup - CPU#[n] stuck for 61s - [procname:procid]"" errors, and that _possibly_ also causes freezing under some situations." defect closed guest smp VirtualBox 3.2.8 fixed Linux Linux