Public bug reported:

I have Ubuntu Precise Pangolin 32 bit, on a cpu that supports 64 bit,
too.

If I run a 64 bit version of Ubuntu inside VirtualBox OSE 4.1.12, the
host system hangs; no key combination works, the only way to gain
control is to press the reset button.

A workaround is to disable nmi watchdog, as described here:

https://www.virtualbox.org/ticket/10528#comment:6

In file /etc/default/grub, put the line:
 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nmi_watchdog=0 nowatchdog"

This will allow VirtualBox to work correctly.

Since the bug has already been reported and fixed in newer version of
VirtualBox (https://www.virtualbox.org/changeset/41645/vbox ), maybe a
simple upgrade could fix it in Ubuntu Precise Pangolin.

** Affects: virtualbox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1078790

Title:
  Virtualbox OSE crashes in Precise Pangolin if I try to run a 64 bit
  guest OS in a 32 bit host

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