=== variant A: crossed sroot bref, mount must fail cleanly ===
mount: Invalid argument
MOUNT_A_RC=1

=== variant E radix-10: crossed file DATA bref, read must fail cleanly ===
MOUNT_E_RC=0
total 66
-rw-r--r--  1 root  wheel  519 Aug 28 12:26 f1
-rw-r--r--  1 root  wheel  597 Aug 28 12:26 w0
dd: /mnt/h2/f1: Input/output error
0+0 records in
0+0 records out
DD_RC=0
=== variant E radix-16 (page-faults unfixed): must fail cleanly ===
MOUNT_E16_RC=0
dd: /mnt/h2/f1: Input/output error
0+0 records in
DD16_RC=0
=== kernel messages ===
hammer2_chain_load_data: illegal data_off geometry 000000000180fd0a.01
hammer2_chain_load_data: illegal data_off geometry 000000000200ff10.03
VALIDATION_DONE
DragonFly 6.5-DEVELOPMENT #1: Fri Aug 28 13:14:29 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC 
 1:23PM  up 1 min, 0 users, load averages: 0.09, 0.04, 0.01