here is the trace. seems like if_ix has to answer some questions here.
if_downall() at if_downall+0x29
boot(104) at boot+0xd3
reboot(104) at reboot+0x68
panic(ffffffff825e4ea8) at panic+0x189
sleep_setup(ffffffff829ae4d8,20,ffffffff8258caa6) at sleep_setup+0x18d
rw_do_enter_write(ffffffff829ae4d0,0) at rw_do_enter_write+0xff
if_downall() at if_downall+0x29
boot(104) at boot+0xd3
reboot(104) at reboot+0x68
panic(ffffffff82654bbd) at panic+0x189
__assert(ffffffff82607cdc,ffffffff82603aae,172,ffffffff8262a10a) at
__assert+0x29
sched_chooseproc() at sched_chooseproc+0x251
mi_switch() at mi_switch+0x10a
sleep_finish(0,1) at sleep_finish+0x112
rw_do_enter_write(ffffffff829ae4d0,0) at rw_do_enter_write+0x119
if_downall() at if_downall+0x29
boot(104) at boot+0xd3
reboot(104) at reboot+0x68
panic(ffffffff8253931c) at panic+0x189
kerntrap(ffff80002a284a30) at kerntrap+0x14d
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
_rb_insert(ffffffff828c4df0,fffffd8003044008,fffffd8003f84500) at
_rb_insert+0x276
uvm_pmr_remove_1strange(ffff80002a284dd8,0,ffff80002a284c90,0) at
uvm_pmr_remove_1strange+0x38f
uvm_pmr_getpages(8,0,100000,8,0,1,92f8f280b30e307a,100000) at
uvm_pmr_getpages+0x6e2
uvm_pglistalloc(8000,0,ffffffff,8000,0,ffff80002a284dd8,718085a8d937e4d8,8000)
at uvm_pglistalloc+0x133
km_alloc(8000,ffff80002a284e58,ffffffff826a15d0,ffff80002a284e70) at
km_alloc+0x29f
pool_multi_alloc(ffffffff82ad25d8,2,ffff80002a285064) at pool_multi_alloc+0xb7
m_pool_alloc(ffffffff82ad25d8,2,ffff80002a285064) at m_pool_alloc+0x4b
pool_p_alloc(ffffffff82ad25d8,2,ffff80002a285064) at pool_p_alloc+0x6c
pool_do_get(ffffffff82ad25d8,2,ffff80002a285064) at pool_do_get+0xf1
pool_get(ffffffff82ad25d8,2) at pool_get+0xb7
m_clget(0,2,802) at m_clget+0x1cf
ixgbe_get_buf(ffff80000100ae8,e6) at ixgbe_get_buf+0xaf
ixgbe_rxfill(ffff80000100ae8) at ixgbe_rxfill+0xad
ixgbe_queue_intr(ffff800000072ac0) at ixgbe_queue_intr+0x69
intr_handler(ffff80002a285270,ffff800000065200) at intr_handler+0x91
Xintr_ioapic_edge0_untramp() at Xintr_ioapic_edge0_untramp+0x18f
acpicpu_idle() at acpicpu_idle+0x239
sched_idle(ffff80002a0e6ff0) at sched_idle+0x298
end trace frame: 0x0, count: 79
End of stack trace.
--db_more--
