[Bug 171711] [dummynet] [panic] Kernel panic in dummynet

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=171711

Andrey V. Elsukov <ae at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ae at FreeBSD.org

--- Comment #7 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to dblais from comment #2)
> #6  0xffffffff80cdbd13 in calltrap ()
>     at /usr/src/sys/amd64/amd64/exception.S:232
> #7  0xffffffff8090adb0 in _rw_rlock (rw=0xfffffe013aade5a8, file=0x0, 
>     line=485069968) at /usr/src/sys/kern/kern_rwlock.c:382
> #8  0xffffffff809c5959 in bpf_mtap2 (bp=0xfffffe013aade580, 
>     data=0xffffff88826429bc, dlen=4, m=0xfffffe0300f46700)
>     at /usr/src/sys/net/bpf.c:2197
> #9  0xffffffff8188e11a in ng_iface_bpftap (ifp=<value optimized out>, m=0x0, 
>     family=144 '\220')
>     at /usr/src/sys/modules/netgraph/iface/../../../netgraph/ng_iface.c:444
> #10 0xffffffff8188eb11 in ng_iface_output (ifp=0xfffffe014566a000, 
>     m=0xfffffe0300f46700, dst=0xffffff8882642aac, ro=<value optimized out>)
>     at /usr/src/sys/modules/netgraph/iface/../../../netgraph/ng_iface.c:394

This panic looks different. Probably an interface has gone away and BPF's
interface departure handler already destroyed bif_lock.

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