=== write-aliasing demo ===
read back via /dev/vn0s0 (entry 0 region):
ENTRY0ZONE_compa
raw LBA 1000 (true entry-127 region) untouched:
ENTRY127ZONE_rea
=== stress: reprobe cycle x3 (devfs duplicate teardown) ===
367 crw-r-----  1 root  operator    8, 0x1e100007 Sep  4 07:58 /dev/vn0s0
377 crw-r-----  1 root  operator    8, 0x1e100007 Sep  4 07:58 /dev/vn0s127
done
--- dd write verbose ---
dd: /dev/vn0s127: Invalid argument
0+1 records in
0+0 records out
0 bytes transferred in 0.009055 secs (0 bytes/sec)
dd rc=1
--- read back via vn0s127 ---
ENTRY0ZONE_compa
--- read back via vn0s0 ---
ENTRY0ZONE_compa
--- raw abs LBA 34 via vn0 ---
ENTRY0ZONE_compa
--- also try disklabel-style write with od ---