=== DF-4327 sf callout deadlock replica Sat Sep 19 12:37:04 UTC 2026 ===
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
sfcal: loaded (kern.sfcal.arm / kern.sfcal.stop)
sfcal: armed sf_stats_update-shaped timer (1 tick)
sfcal[stop]: serializer held; waiting for callback to be provably blocked on it...
sfcal[stop]: callback fired=10 ran=9 -> BLOCKED on serializer. calling callout_stop() under serializer (if_sf.c:1344 protocol)...
--- thread states ---
   979 D4     costp    sysctl kern.sfcal.stop=1
--- stop never returned: no UNEXPECTED line above = callout_stop() still blocked (AB-BA) ---