4.3.8: VERR_CPUM_TOO_MANY_CPUID_SUBLEAVES when launching VM [FIXED in SVN]

[mmcginnis]

I just installed VirtualBox on a Lenovo T410 with Hyper-V enabled. Upon launching a VM I get the lowwing error: Failed to open a session for the virtual machine XP Virtual.

Couldn't find the end of CPUID sub-leaves. (VERR_CPUM_TOO_MANY_CPUID_SUBLEAVES).

Result Code: E_FAIL (0x80004005) Component: Console Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

[mmcginnis]

log file

[dhognert]

Same issue here. Lenovo T430S running Windows 8.

[dhognert]

VBox.log

[bird]

Thanks to your reports we've been able to come up with a workaround to deal with this unspecified CPUID behavior. We'll try get the fix out ASAP.

[mmcginnis]

I found another fix for me. My laptop had Hyper-V enabled in the BIOS (I am unable to disable it due to corporate limitations). I found that doing the following and rebooting my laptop allows the VM's to run:

Hope this helps....

1. Open Hyper-V manager and "stop service" on the right panel,

2. Start a command prompt with administrator rights and execute the following command:

to disable hyper-v bcdedit /set hypervisorlaunchtype off

to enable hyper-v bcdedit /set hypervisorlaunchtype auto

3. Both Operations require restarting your computer.

Reference:  https://forums.virtualbox.org/viewtopic.php?f=6&t=41258#p236620

[frank]

Please could you confirm that this build fixes your problem?

[tucaz]

I had the same problem and can confirm that the build 4.3.9-92650 fixed the problem.

[pcaenaro]

I am running build 4.3.8 r92456, but the update says I am running the latest version. I have the same problem as reported here, how to I get the latest build?

[frank]

4.3.8 is the latest released build. If you want to test the test build, see comment 4.

[bambitlaw]

Just confirming, I had the same issue and build 4.3.9-92650 fixed it. Lenov idea pad, windows 8.1 64bit

[frank]

Fix is part of VBox 4.3.10.