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Subject: [Bug 222680] bnxt (iflib model): While VLAN TCP Tx is progress, 
 "ifconfig destroy" caused kernel Crash
Date: Wed, 04 Oct 2017 01:43:38 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222680

Matt Joras <mjoras@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|freebsd-net@FreeBSD.org     |mjoras@freebsd.org
                 CC|                            |mjoras@freebsd.org

--- Comment #2 from Matt Joras <mjoras@freebsd.org> ---
Do you still have the dump? I am guessing this crashed on this line:
if (bpf_peers_present((_ifp)->if_bpf)) {
The ifp at this point is the VLAN ifp. Since the the VLAN ifp was destroyed
this ends up accessing free'd memory and hence your crash.

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