misc/163263: crash on VirtualBox when ACPI is enabled

[Greg 'groggy' Lehey]

On Tuesday, 18 December 2012 at  4:42:35 +0000, grog at FreeBSD.org wrote:

This crash can occur if your VM doesn't have ACPI enabled.  Please
check (preferably with the current version of VirtualBox) that the
extended feature "Enable IO APIC" is set in
Settings/System/Motherboard.

The "panic: No usable event timer found!" may be related to the
Chipset setting on the same configuration page.  I've found it happens
with PIIX3, but not with ICH9.

Please let me know if this works around the issue.

Greg
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