[Bug 236121] FreeBSD 12.0: periodically panics

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236121

--- Comment #2 from Conrad Meyer <cem at freebsd.org> ---
panic: page fault
cpuid = 1
time = 1551382342

GDB6 stack:

#5  0xffffffff8073c1f9 in trap_pfault (frame=0xfffffe001e4f8480, usermode=0)
    at pcpu.h:230
#6  0xffffffff8073b81e in trap (frame=0xfffffe001e4f8480)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/amd64/amd64/trap.c:441
#7  0xffffffff80718305 in calltrap ()
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/amd64/amd64/exception.S:232
#8  0xffffffff804ca971 in sched_pickcpu (td=0x0, flags=<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/kern/sched_ule.c:820
#9  0xffffffff804caec4 in sched_add (td=0xfffff80002388580, flags=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/kern/sched_ule.c:2560
#10 0xffffffff804facaa in turnstile_unpend (ts=0xfffff8000205d780)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/kern/subr_turnstile.c:980
#11 0xffffffff8047df11 in __mtx_unlock_sleep (c=0xfffff8000554ced8,
    v=18446735277953455490)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/kern/kern_mutex.c:1032
#12 0xffffffff8059c4b8 in if_transmit (ifp=0xfffff80005a65800,
    m=<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/net/if.c:4011
#13 0xffffffff8059f551 in ether_output_frame (ifp=0xfffff80005a65800,
    m=<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/net/if_ethersubr.c:482
#14 0xffffffff81c5e999 in ng_apply_item (node=0xfffff80005ab6900,
    item=0xfffff8001427f800, rw=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2403
#15 0xffffffff81c5e43f in ng_snd_item (item=0xfffff8001427f800, flags=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2320
#16 0xffffffff81c773b5 in ng_pppoe_rcvdata (hook=0x18, item=0xfffff8001427f800)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_pppoe.c:1446
#17 0xffffffff81c5e999 in ng_apply_item (node=0xfffff800052fd200,
    item=0xfffff8001427f800, rw=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2403
#18 0xffffffff81c5e43f in ng_snd_item (item=0xfffff8001427f800, flags=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2320
#19 0xffffffff81c5e999 in ng_apply_item (node=0xfffff8001411d800,
    item=0xfffff8001427f800, rw=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2403
#20 0xffffffff81c5e43f in ng_snd_item (item=0xfffff8001427f800, flags=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2320
#21 0xffffffff81c701d5 in ng_ppp_link_xmit (node=<value optimized out>,
    item=0xfffff8001427f800, proto=<value optimized out>,
    linkNum=<value optimized out>, plen=56)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_ppp.c:1364
#22 0xffffffff81c5e999 in ng_apply_item (node=0xfffff800140afb00,
    item=0xfffff8001427f800, rw=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2403
#23 0xffffffff81c5e43f in ng_snd_item (item=0xfffff8001427f800, flags=0)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2320
#24 0xffffffff81c5e999 in ng_apply_item (node=0xfffff80034801c00,
    item=0xfffff8001427f800, rw=1)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:2403
#25 0xffffffff81c6117a in ngthread (arg=<value optimized out>)
    at /.../hal/z/SRC/FreeBSD/releng/12.0/sys/netgraph/ng_base.c:3434

Last few lines of dmesg prior to panic:

ipfw: 10114 SkipTo 14000 TCP 192.168.1.19:63749 18.9.60.141:11371 out via ng0
ipfw: 10114 SkipTo 14000 TCP 192.168.1.19:63749 18.9.60.141:11371 out via ng0
ipfw: 10114 SkipTo 14000 TCP 192.168.1.19:63749 18.9.60.141:11371 out via ng0

I'm guessing this is related to netgraph.

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