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Date:      Sun, 21 Oct 2018 01:24:30 +0000
From:      bugzilla-noreply@freebsd.org
To:        stable@FreeBSD.org
Subject:   [Bug 227654] [panic] repeatable crash with lagg+vlan+em
Message-ID:  <bug-227654-1689-kDIyu3XFKJ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-227654-1689@https.bugs.freebsd.org/bugzilla/>
References:  <bug-227654-1689@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227654

--- Comment #5 from Eugene Grosbein <eugen@freebsd.org> ---
I've added additional printf's to sys/net/if_ethersubr.c and found that it
panices within ether_output_frame() function.

I've added this just before PFIL_HOOKED(&V_link_pfil_hook) check:

if (ifp->if_index =3D=3D 6) printf(""ether_output_frame: checking curvnet=
=3D%p\n",
curvnet);
if (ifp->if_index =3D=3D 6) printf(""ether_output_frame: V_link_pfil_hook=
=3D%p\n",
V_link_pfil_hook);

And last lines of dmesg buffer after panic are:

ether_output_frame: checking curvnet=3D0
panic: vm_fault_hold: fault on nofault entry, addr: 0

So, curvnet is NULL here, hence the panic.

--=20
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