id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 1294,VirtualBox.exe pegs CPU when guest idle,smoehle,,"A Windows XP Pro SP2 guest running on a Windows XP Pro SP2 host causes VirtualBox.exe on the host to consume 90% of the CPU even though the guest is idle and its task manager shows CPU usage 1 or 2%. Process Explorer from Sysinternals shows that the call stack of the offending thread in VirtualBox.exe is usually one of the following: ntkrnlpa.exe+0x6dbeb ntkrnlpa.exe+0xe807c ntkrnlpa.exe+0x6986c ntdll.dll!KiFastSystemCallRet VBoxRT.dll!RTSemEventWaitNoResume+0x1a VBoxRT.dll!RTSemEventWait+0x39 VBoxVMM.dll!MMR3Term+0x86b VBoxVMM.dll!VMR3WaitHalted+0xea VBoxVMM.dll!EMR3ExecuteVM+0x248 VBoxVMM.dll!VMR3Wait+0x2d9 VBoxRT.dll!RTThreadGetType+0x1ab VBoxRT.dll!RTSystemProcessorGetActiveMask+0xfd MSVCR71.dll!endthreadex+0xa0 kernel32.dll!GetModuleFileNameA+0x1b4 ntkrnlpa.exe+0x6dbeb ntkrnlpa.exe+0x2b462 hal.dll+0x2ef2 VBoxVMM.dll+0x6a0fd VBoxVMM.dll!TMTimerPoll+0x1b1 VBoxVMM.dll!MMR3Term+0x7a6 VBoxVMM.dll!VMR3WaitHalted+0xea VBoxVMM.dll!EMR3ExecuteVM+0x248 VBoxVMM.dll!VMR3Wait+0x2d9 VBoxRT.dll!RTThreadGetType+0x1ab VBoxRT.dll!RTSystemProcessorGetActiveMask+0xfd MSVCR71.dll!endthreadex+0xa0 kernel32.dll!GetModuleFileNameA+0x1b4 ntkrnlpa.exe+0x6dbeb ntkrnlpa.exe+0x2b462 hal.dll+0x2ef2 VBoxVMM.dll!TMTimerGetMilli+0xf1 VBoxVMM.dll!TMTimerGetMilli+0x498 VBoxVMM.dll!TMVirtualGet+0xe VBoxVMM.dll!TMTimerPoll+0x21 VBoxVMM.dll!MMR3Term+0x7a6 VBoxVMM.dll!VMR3WaitHalted+0xea VBoxVMM.dll!EMR3ExecuteVM+0x248 VBoxVMM.dll!VMR3Wait+0x2d9 VBoxRT.dll!RTThreadGetType+0x1ab VBoxRT.dll!RTSystemProcessorGetActiveMask+0xfd MSVCR71.dll!endthreadex+0xa0 kernel32.dll!GetModuleFileNameA+0x1b4 ",defect,closed,other,VirtualBox 1.5.6,fixed,,,other,other