== Running as uid=1001 euid=1001 gid=1001
== Opening /mnt/hammer/testfile
HAMMERIOC_LIST_VOLUMES: rc=0 errno=0 (Undefined error: 0) nvols=1
--- VOLUME LIST OUTPUT (privileged leak surface) ---
  [0] vol_no=0 device_name='/dev/vn0' len=8
HAMMERIOC_ADD_VOLUME (non-NUL device_name): rc=-1 errno=1 (Operation not permitted)
RUN_EXIT=0