From owner-freebsd-emulation@freebsd.org  Fri Jul 31 22:33:44 2015
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Date: Fri, 31 Jul 2015 16:33:43 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: freebsd-emulation@FreeBSD.org
Subject: VirtualBox VMs with large amounts of RAM
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It seems I can reliably lock up my 10-STABLE amd64 VirtualBox host by 
giving a Windows 7 VM more than about 12G of RAM.  The VM starts, the 
mouse gets draggy and then the whole system hardlocks.  This is on a 
system with 16G total, so there should be plenty left for the host (no 
ZFS).

Is this a known problem?