id summary reporter owner description type status component version resolution keywords cc guest host 5040 Windows Server 2003 VM and VirtualBox UI were frozen until I restarted my host OS -> retry with 3.0.10 Viktor Ferenczi "=== Host === Host OS: Ubuntu 9.04 amd64 Host CPU: Intel Q6600 Host memory: 8G Video driver: nVidia proprietary v180, installed by Ubuntu's non-free driver manager VirtualBox 3.0.6 from the apt source (upgraded from 3.0.4 a few days ago) The host works fine. === Guest === Windows Server 2003, see the attached VM configuration file. Latest Guest Additions (3.0.6) were installed, then the guest was rebooted correctly. === Symptom === My Windows 2003 guest system suddenly became frozen. I haven't done anything special, there were no excessive CPU load or I/O. I just used SkyPE chat in the guest, then moved my mouse and the whole VM became frozen. I tried to suspend/resume the VM as a workaround using the menu of the VM's window, but the menu did not drop down. The whole window was frozen. I tried to open VirtualBox's Manager window, but it did not open. I tried to execute VirtualBox from the shell, but it became forzen without printing anything. The `ps -Af|grep VirtualBox` command resulted in the following list: {{{ fviktor@sirius:~$ ps -Af|grep VirtualBox fviktor 7479 7466 22 Sep19 ? 01:00:14 /usr/lib/virtualbox/VirtualBox --comment windows-2003 --startvm 75bb967e-cf4d-4b0a-ae66-e4a53ab21f82 fviktor 12173 1 0 03:16 ? 00:00:00 /usr/lib/virtualbox/VirtualBox fviktor 12520 1 0 03:21 ? 00:00:00 /usr/lib/virtualbox/VirtualBox fviktor 12600 1 0 03:25 ? 00:00:00 /usr/lib/virtualbox/VirtualBox fviktor 12617 1 0 03:25 ? 00:00:00 /usr/lib/virtualbox/VirtualBox fviktor 12695 12635 0 03:26 pts/4 00:00:00 grep VirtualBox }}} So there were a number of stuck up processes. After issuing a `killall -9 VirtualBox` command, one of them became defunct: {{{ fviktor 7479 7466 22 Sep19 ? 01:00:14 [VirtualBox] }}} Starting VirtualBox was impossible until I rebooted my entire host system. See the attached VM log." defect closed VMM/HWACCM VirtualBox 3.0.6 worksforme Windows Linux