CC_RC=0
bfe walk harness: CDMASK=0xfff desc_sz=8 ring=511 entries (valid 0..510)
encodable descriptor indices: 0..511  -> index 511 is OUTSIDE the ring (ring max 510)
offsets encoding the off-ring index: [4088..4095]  (driver itself writes 4088 (511*8) to BFE_DMARX_PTR at if_bfe.c:549)
current=511: walk NEVER TERMINATES (no cons in 0..510 equals it; >1e6 steps)
RESULT: off-ring index 511 => bfe_rxeof/bfe_txeof walk cannot terminate (interrupt-context livelock holding the serializer)
HARN_RC=0
---ENV---
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
vtnet0 lo0
NO_BROADCOM_NO_80003
sysctl: unknown oid 'hw.bfe'
sysctl: unknown oid 'hw.igb'
MD5 (/usr/src/sys/dev/netif/bfe/if_bfe.c) = 90d081d452388497680d4a6de8af2baf
MD5 (/usr/src/sys/dev/netif/ig_hal/e1000_80003es2lan.c) = 4c5dbc03e5a52e244d3fd0d3201771a6