カーネルパニックしてリブート入った模様。 < news19
amd64 だと、FreeBSD 6.1R は微妙な挙動があるのかも。

cat info.5
Dump header from device /dev/da0s1b
Architecture: amd64
Architecture Version: 2
Dump Length: 4226842624B (4031 MB)
Blocksize: 512
Dumptime: Sun Jun 4 13:08:30 2006
Hostname: cobra2247.maido3.com
Magic: FreeBSD Kernel Dump
Version String: FreeBSD 6.1-RELEASE #0: Tue May 9 01:41:03 PDT 2006
root@cobra2247.maido3.com:/var/src/sys/amd64/compile/AMD64_COBRA_61_NOKBDMUX_NOPREEMPTION
Panic String: spin lock held too long
Dump Parity: 3586994136
Bounds: 5
Dump Status: good