[Bug 242406] mpd & 3G USB modem: Fatal trap 12: page fault while in kernel mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242406

            Bug ID: 242406
           Summary: mpd & 3G USB modem: Fatal trap 12: page fault while in
                    kernel mode
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gadskypapa at gmail.com

Created attachment 209654
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=209654&action=edit
core dump info

I need a backup internet channel and like to use a 3G USB modem for the
purpose. I've configured mpd5 and it's up and running until a first packet will
go through ng0 interface. And I've a kernel panic.

FreeBSD nucbox 12.1-RELEASE-p1 FreeBSD 12.1-RELEASE-p1 GENERIC  amd64

u3g0: <HUAWEI Technology HUAWEI Mobile, class 0/0, rev 2.00/0.00, addr 4> on
usbus0

ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> metric 0 mtu
1500
description: TELE2 3G
inet 10.163.59.45 --> 1.1.1.1 netmask 0xffffffff
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

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