Guru Meditation on Win7 x64 host, Xubuntu x64 guest

[DanL856]

I'm running VirtualBox 4.2.12 on Windows 7 (x64), and was using a 64-bit Xubuntu guest for a while with no problems. I also had a guest running CentOS 5. When I turned on my machine this morning, I got a guru meditation error on both machines.

Any ideas?

• VirtualBox 4.2.12
• Guest add-ons installed and up-to-date on both
• Host and guests are all 64-bit
• Host has 16Gb RAM, Xubuntu guest has 8Gb assigned, CentOS has 3Gb assigned
• Logs from both guests attached

[DanL856]

After doing the old Windows standby of restarting the computer, it works fine.

[mpack]

00:45:12.677426 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
00:45:12.677428 !!
00:45:12.677429 !! Guru Meditation -4011 (VERR_VMX_IN_VMX_ROOT_MODE)
00:45:12.677447 !!
00:45:12.677526 !!
00:45:12.677527 !! {mappings, <NULL>}
00:45:12.677530 !!

It means something else is already using VT-x.