id,summary,reporter,owner,description,type,status,component,version,resolution,keywords,cc,guest,host 16428,Restoring snapshots does not work for Multi-processor VMs,hunterbr,,"I encountered a serious issue in Vbox 5.1.51 (compiled from source, cloned from git 25 Jan 2017), inside a Vbox VM I have Win7x64 SP1 running, everything works fine, I do a snapshot and shut down the OS. If I restore the snapshot and start the Vbox VM, the following error occurs: {{{ cpum#1: X86_CPUID_FEATURE_EDX_HTT is not supported by the host but has already exposed to the guest [ver=17 pass=final] (VERR_SSM_LOAD_CPUID_MISMATCH). Result Code: NS_ERROR_FAILURE (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed} }}} This only happens with VMs with more than one CPU. If I discard the snapshot I can start the machine with two CPU without a problem. If I se t it to one CPU, the snapshots are working. The Vbox app is running inside an Ubuntu 16.04.1LTS which is running inside VMware Worksation VM(details below). VBox running inside an: * Ubuntu 16.04.1 LTS * Linux ubuntu 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux running inside a VM from: * VMware® Workstation 12 Pro * 12.5.2 build-4638234 * Memory 4GB * Processors: 4 (num cores 1) * Virtualization Engine: * Prefered mode: Automatic * Disable acceleration for binary translation: not set * Virtualize Intel VT-x/EPT or AMD-V/RVI: enabled * Virtualize CPU performance counter: enabled * HD: 200GB ",defect,closed,VMM,VirtualBox 5.1.14,fixed,multiprocessor snapshot,hunterbr@…,Windows,Linux