id summary reporter owner description type status component version resolution keywords cc guest host 11945 Suddenly CPU usage reach 100% Lorenzo_ "My Host is Windows 7 64 bit. I have 2 guests: - Windows XP sp3 - Windows 7 32 bit I used them for months without any problem. 2 months ago those guests began having a problem: sometimes after 10 minutes, sometimes after some hour, CPU reach 100% usage and never go down. Sometime on the W7 guest, sometime on the XP guest. When both are runnig, the problem appear on both vm almost simultaneously. I' ve tried a lot of solutions searching on the web, but nothing solved this. The problem appears when I use one of those VM and even when both are running. I tried: - to change antivirus (security essential > trend micro) (vm w7 and xp) - to remove antivirus (vm w7 and xp) - to scan guests and host with Combofix (vm w7 - nothing found - and xp: removed 3/4 dll) - to scan guests and host with Malwarebytes (vm w7 and xp) (nothing found) - to set video memory to 32, 64 and 128 MB (vm w7 and xp) - to move the W7 vm on an eSata HDD , then to an USB HDD (vm W7) - to remove nested paging (vm W7 and XP) - to install APIC (vm W7) - to change VirtualBox Version (4.2.10 > 4.2.12 > 4.2.14) It seems that it has something to do with Network load: - once, disconnecting a Cisco VPN, the CPU load came back to normal values; - disabling the Network Device (from Machine > Devices > Network) end leaving the vm on Pause for some minute the CPU load came back to normal values; after this I can set the network device as it were before the problem without other issues. This works EVERY time. I tried to work with bridge card and with NAT, but even this can't prevent the problem. https://forums.virtualbox.org/viewtopic.php?f=2&t=56176" defect closed other VirtualBox 4.2.14 obsolete cpu high usage 100 Windows Windows