VB crashes Windows 7

[antonjo]

I have VirtualBox 4.2.6 on Win7 x64. My system is a Sony Vaio Z, with an Intel i5 CPU. Sony updates does not retrieve any updates for BIOS or such.

I have created a standard Ubuntu guest with the wizard and attached a premade Turnkey Rails 11.3-lucid-x86 vmdk disk.

When the guest shuts down, the Windows host goes blank and restarts.

This happens both powering off the guest and using the graceful guest shutdown sequence.
I have tried with different guests: Ubuntu, Win7 x64. I also tried to change chipset from the default PIIX3 to ICH9, always the same.
My system has a double video card. The less powerful video card takes over the main one when I switch on battery. Anyway all the tests where made having the power cord attached.

The log is attached.

Thanks for help

[Perryg]

Code: Select all

00:00:09.716698 HWACCM: No VT-x or AMD-V CPU extension found. Reason VERR_VMX_MSR_LOCKED_OR_DISABLED

Find where to turn this on in your bios and see if that helps.

[antonjo]

You were right, virtualisation extensions were disabled.
I enabled virtualisation extensions in BIOS, but VB still crashes the host.
Anyway I checked VMware player can go both with and without extensions. So it should be something else.

I attached the log of a new test with m0n0wall (Freebsd).