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Date: Sun, 19 Jan 2014 16:01:13 +0400
From: Sergey Matveychuk <sem@FreeBSD.org>
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Subject: panic: AP #1 (PHY# 1) failed!
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Hi.

Now I can say it happens not every time but one time on two or three 
good boots.

FreeBSD bhyve 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #0 r259951: Sat 
Dec 28 03:44:43 MSK 2013     root@myhost:/usr/obj/usr/src/sys/GENERIC  amd64

VM_MEMSIZE="1024"
VM_IFACE="tap0"
VM_CPUNUM="2"
...
/usr/sbin/bhyve -c ${VM_CPUNUM} -m ${VM_MEMSIZE} -AI -HP -g0 \
         -s 0:0,hostbridge \
         -s 1:0,virtio-net,${VM_IFACE} \
         -s 2:0,virtio-blk,${VM_DISK} \
         -S 31,uart,${VM_CONSOLE} \
         ${VM_NAME}

Need any more info?