flood threshold evidence (stock kernel, boot of 2026-09-01, guest dfbsd)
first flood lines:
  896:Sep  1 13:26:03 dfbsd kernel: "can.t re-use a leaf (sys_set_hostname)"
churn started 13:25 (~90s earlier, >1000 jails/s => id 100000 crossed at flood onset)
flood total at quiesce: 78760
jids.log range: 108261 .. 113260, count 5000, duplicates:        0
kbuild:
===> dev/drm/radeonfw/BONAIRE_smc
KBUILD_RC:0