[Bug 220073] iflib panic r320049

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220073

            Bug ID: 220073
           Summary: iflib panic r320049
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dchagin at FreeBSD.org

Fatal trap 12: page fault while in kernel mode
cpuid = 6; apic id = 06
fault virtual address   = 0x0
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff8071093e
stack pointer           = 0x28:0xfffffe04562cf8f0
frame pointer           = 0x28:0xfffffe04562cf9d0
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         = 0 (if_io_tqg_6)

(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:232
#1  doadump (textdump=0x81453290) at
/home/git/head/sys/kern/kern_shutdown.c:318
#2  0xffffffff8036e4cc in db_fncall_generic (addr=<optimized out>,
rv=<optimized out>, nargs=<optimized out>, 
    args=<optimized out>) at /home/git/head/sys/ddb/db_command.c:581
#3  db_fncall (dummy1=<optimized out>, dummy2=<optimized out>,
dummy3=<optimized out>, dummy4=<optimized out>)
    at /home/git/head/sys/ddb/db_command.c:629
#4  0xffffffff8036e03f in db_command (last_cmdp=<optimized out>,
cmd_table=<optimized out>, dopager=<optimized out>)
    at /home/git/head/sys/ddb/db_command.c:453
#5  0xffffffff8036dd74 in db_command_loop () at
/home/git/head/sys/ddb/db_command.c:506
#6  0xffffffff80370eaf in db_trap (type=<optimized out>, code=<optimized out>)
at /home/git/head/sys/ddb/db_main.c:248
#7  0xffffffff8063eed3 in kdb_trap (type=0xc, code=0x0, tf=<optimized out>) at
/home/git/head/sys/kern/subr_kdb.c:654
#8  0xffffffff8092caa2 in trap_fatal (frame=0xfffffe04562cf830, eva=0x0) at
/home/git/head/sys/amd64/amd64/trap.c:819
#9  0xffffffff8092cb52 in trap_pfault (frame=0xfffffe04562cf830, usermode=0x0)
    at /home/git/head/sys/amd64/amd64/trap.c:680
#10 0xffffffff8092be8d in trap (frame=0xfffffe04562cf830) at
/home/git/head/sys/amd64/amd64/trap.c:425
#11 <signal handler called>
#12 m_init (how=0x1, type=0x1, m=<optimized out>, flags=<optimized out>) at
/home/git/head/sys/sys/mbuf.h:721
#13 iflib_rxd_pkt_get (rxq=<optimized out>, ri=<optimized out>) at
/home/git/head/sys/net/iflib.c:2432
#14 iflib_rxeof (budget=0x10, rxq=<optimized out>) at
/home/git/head/sys/net/iflib.c:2529
#15 _task_fn_rx (context=0xfffff800046e9000) at
/home/git/head/sys/net/iflib.c:3510
#16 0xffffffff8063d3b9 in gtaskqueue_run_locked (queue=0xfffff80008f9c200)
    at /home/git/head/sys/kern/subr_gtaskqueue.c:329
#17 0xffffffff8063d148 in gtaskqueue_thread_loop (arg=<optimized out>) at
/home/git/head/sys/kern/subr_gtaskqueue.c:504
#18 0xffffffff805c180b in fork_exit (callout=0xffffffff8063d0c0
<gtaskqueue_thread_loop>, arg=0xfffffe0000f2f098, 
    frame=0xfffffe04562cfac0) at /home/git/head/sys/kern/kern_fork.c:1038
#19 <signal handler called>
(kgdb)
(kgdb) up 13
#13 iflib_rxd_pkt_get (rxq=<optimized out>, ri=<optimized out>) at
/home/git/head/sys/net/iflib.c:2432
2432                    m_init(m, M_NOWAIT, MT_DATA, M_PKTHDR);
(kgdb) p m
$1 = (struct mbuf *) 0x0
(kgdb)

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