id summary reporter owner description type status component version resolution keywords cc guest host 10247 VirtualBox 4.1.8 stops with VERR_VMX_INVALID_GUEST_STATE on single step over STI instruction jkp "Debugging Windows driver with Windows XP SP3 Build 2600 as guest; Windows 7 as host. Using WinDBG over pipe/virtual COM port to debug guest kernel. Single stepping through idle loop (KiIdleLoop) until sti instruction. Attempting to step over sti instruction will shut down VirtualBox with the error shown in the log. " defect closed VMM VirtualBox 4.1.8 fixed Windows Windows