[Bug 243223] [vtnet] panic during boot when IP is assigned in /etc/rc.conf

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243223

            Bug ID: 243223
           Summary: [vtnet] panic during boot when IP is assigned in
                    /etc/rc.conf
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: alfredo.junior at eldorado.org.br

While testing a custom kernel with virtio drivers bultin on FreeBSD
13/powerpc64, I hit a panic during boot.

I have the following line in /etc/rc.conf:

    ifconfig_vtnet0="inet 10.10.20.73 netmask 255.255.255.0"

If I remove this line, kernel boots correctly. Also NIC works normally if I
configure the IP address manually after boot.

kernel log during boot:

vtnet0: link state changed to UP
panic: keg vtnet_tx_hdr initialization after use.
cpuid = 0
time = 1578601768
KDB: stack backtrace:
0xe00000005a459140: at kdb_backtrace+0x60
0xe00000005a459250: at vpanic+0x1d8
0xe00000005a459300: at panic+0x40
0xe00000005a459330: at uma_zone_reserve+0x160
0xe00000005a4593e0: at vtnet_debugnet_init+0xac
0xe00000005a459440: at debugnet_any_ifnet_update+0x74
0xe00000005a4594f0: at dn_ifnet_event+0x28
0xe00000005a459520: at do_link_state_change+0x29c
0xe00000005a4595d0: at taskqueue_run_locked+0x184
0xe00000005a4596a0: at taskqueue_run+0x64
0xe00000005a4596e0: at taskqueue_swi_run+0x28
0xe00000005a459710: at ithread_loop+0x2cc
0xe00000005a459820: at fork_exit+0xc4
0xe00000005a4598c0: at fork_trampoline+0x18
0xe00000005a4598f0: at -0x4
KDB: enter: panic
[ thread pid 12 tid 100024 ]
Stopped at      kdb_enter+0x78: ori     r0, r0, 0x0
db>

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