### build ###
built vinum_overflow (harness). Live repro: sh live_repro.sh (root)
### harness run ###
DF-1397 config_plex auto-naming overflow demonstration
plex->name capacity: 64 bytes (MAXPLEXNAME)
volume name length: 63 (fills name[0..62], NUL at [63])
effective printed name length (walked past 64-byte buffer): 66
organization field bytes (offset 64..67): 70(p) 30(0) 00(.) 00(.) 
organization enum value now: 12400 (was plex_concat=1)

OVERFLOW CONFIRMED: strcat(".p%d") wrote past the 64-byte name into the organization enum field.
Live proof on guest: kldload vinum + `vinum create` with a 63-char volume name yields a plex printed as 66 chars (see run.log).
### exit=0 ###