Fatal Error - Guru Meditation

Discussions related to using VirtualBox on Windows hosts.
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Cpalta
Posts: 1
Joined: 13. Apr 2021, 16:51

Fatal Error - Guru Meditation

Post by Cpalta »

Dear readers,

For the past years I've been using VirtualBox to create VM's to try out and learn any OS I found and used it to teach my students build a client network setup with Windows.
Out of nothing today none of my VM's worked anymore. I got a message saying a fatal error occured but no specific reason in the message.
The message is in Dutch so I didn't bother taking a screenshot but I added the log fils below in a zip file because the text file was too big to upload on the forums.
Server1-2021-04-13-16-48-26.zip
(54.1 KiB) Downloaded 10 times
I tried rebooting, reinstalling VirtualBox already 3 times but nothing changed. I lost all my VM's sadly but I hope you can help me out to fix the issue so I can continue using VirtualBox.

Thanks in advance!
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: Fatal Error - Guru Meditation

Post by mpack »

I hardly even need to look at the log: your last Windows update enabled Hyper-v, or you enabled it yourself by choosing some component that needs it.

But, just for form's sake, here is the confirmation from the log.
00:00:06.736250 HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
00:00:06.784881 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...
And here is the relevant FAQ: HMR3Init: Attempting fall back to NEM (Hyper-V is active)
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