Unread portion of the kernel message buffer:
fault virtual address   = 0x20
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff80f214d6
stack pointer           = 0x28:0xfffffe00003d0620
frame pointer           = 0x28:0xfffffe00003d0630
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 12 (irq264: igb0:que 0)

(kgdb) bt
#0  doadump (textdump=0) at pcpu.h:221
#1  0xffffffff8037f6ee in db_dump (dummy=<value optimized out>, dummy2=false, dummy3=0, dummy4=0x0) at /root/head/sys/ddb/db_command.c:533
#2  0xffffffff8037f2a1 in db_command (cmd_table=0x0) at /root/head/sys/ddb/db_command.c:440
#3  0xffffffff8037ef34 in db_command_loop () at /root/head/sys/ddb/db_command.c:493
#4  0xffffffff80381b5b in db_trap (type=<value optimized out>, code=0) at /root/head/sys/ddb/db_main.c:251
#5  0xffffffff80ad8ac4 in kdb_trap (type=12, code=0, tf=<value optimized out>) at /root/head/sys/kern/subr_kdb.c:654
#6  0xffffffff80f23965 in trap_fatal (frame=0xfffffe00003d0570, eva=<value optimized out>) at /root/head/sys/amd64/amd64/trap.c:848
#7  0xffffffff80f23ce6 in trap_pfault (frame=0xfffffe00003d0570, usermode=<value optimized out>) at /root/head/sys/amd64/amd64/trap.c:676
#8  0xffffffff80f23344 in trap (frame=0xfffffe00003d0570) at /root/head/sys/amd64/amd64/trap.c:426
#9  0xffffffff80f067b2 in calltrap () at /root/head/sys/amd64/amd64/exception.S:235
#10 0xffffffff80f214d6 in memcpy () at /root/head/sys/amd64/amd64/support.S:161
#11 0xffffffff80be2387 in arpintr (m=<value optimized out>) at /root/head/sys/netinet/if_ether.c:985
#12 0xffffffff80b923e1 in netisr_dispatch_src (proto=<value optimized out>, source=<value optimized out>, m=0x0) at /root/head/sys/net/netisr.c:972
#13 0xffffffff80b87f19 in ether_demux (ifp=<value optimized out>, m=<value optimized out>) at /root/head/sys/net/if_ethersubr.c:768
#14 0xffffffff80b88af8 in ether_nh_input (m=<value optimized out>) at /root/head/sys/net/if_ethersubr.c:575
#15 0xffffffff80b923e1 in netisr_dispatch_src (proto=<value optimized out>, source=<value optimized out>, m=0x0) at /root/head/sys/net/netisr.c:972
#16 0xffffffff80b88156 in ether_input (ifp=<value optimized out>, m=0x0) at /root/head/sys/net/if_ethersubr.c:676
#17 0xffffffff8053f004 in igb_rxeof (count=337545368) at /root/head/sys/dev/e1000/if_igb.c:4979
#18 0xffffffff8053f770 in igb_msix_que (arg=0xfffff80115624000) at /root/head/sys/dev/e1000/if_igb.c:1641
#19 0xffffffff80a555ba in intr_event_execute_handlers (p=<value optimized out>, ie=0xfffff801155e5900) at /root/head/sys/kern/kern_intr.c:1262
#20 0xffffffff80a55f36 in ithread_loop (arg=0xfffff80115642420) at /root/head/sys/kern/kern_intr.c:1275
#21 0xffffffff80a526cc in fork_exit (callout=0xffffffff80a55e90 <ithread_loop>, arg=0xfffff80115642420, frame=0xfffffe00003d0ac0)
    at /root/head/sys/kern/kern_fork.c:1006
#22 0xffffffff80f06cee in fork_trampoline () at /root/head/sys/amd64/amd64/exception.S:610
#23 0x0000000000000000 in ?? ()
Current language:  auto; currently minimal