Guest: DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026 root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64
CPUs: 6 (QEMU/KVM), RAM 4G
NICs: vtnet0 (virtio), lo0 — the guest's primary NIC is virtio, NOT bfe
      (QEMU has no BCM4401/BCM4402 device model; adding one is impossible)
pciconf -l | grep -i -E "14e4|broadcom"  -> NO_BROADCOM_PCI
sysctl hw.bfe                            -> unknown oid 'hw.bfe'  (driver never attached)
/boot/kernel/if_bfe.ko                   -> present as a module only
sysctl hw.igb                            -> unknown oid 'hw.igb'  (no igb/80003 either)
Source identity:
  md5 /usr/src/sys/dev/netif/bfe/if_bfe.c = 90d081d452388497680d4a6de8af2baf
  md5 audited sys/dev/netif/bfe/if_bfe.c  = 90d081d452388497680d4a6de8af2baf  (identical)
  md5 /usr/src/sys/dev/netif/ig_hal/e1000_80003es2lan.c = 4c5dbc03e5a52e244d3fd0d3201771a6
  md5 audited sys/dev/netif/ig_hal/e1000_80003es2lan.c  = 4c5dbc03e5a52e244d3fd0d3201771a6  (identical)
MCLBYTES (guest /usr/src/sys/sys/param.h:495) = 1<<11 = 2048 — used to
prove the rxeof length filter is cluster-safe (max 1550+30=1580 <= 2048).
Post-run state: guest reset to 'with-src' snapshot after the AB-BA wedge
(wedged D2 thread + wedged softclock thread are unsurvivable).