[Bug 210379] [panic] in6_lltable_dump_entry bcopy page fault

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210379

            Bug ID: 210379
           Summary: [panic] in6_lltable_dump_entry bcopy page fault
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: allanjude at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

My router running 11.0-ALPHA1 r301090 has crashed repeatedly:

http://imgur.com/a/8wbuZ

It is running net-snmp 5.7.3_11

It routes native v4 and v6, to a lagg(4) with some vlan(4) interfaces


the crash appears to be caused by snmpd calling sysctl to get some data.

I cannot consistently cause the crash, but it has happened 5 times in the last
week, sometimes almost immediately upon boot. Anecdotally, it seems to
sometimes correlate to when one of the machines behind the router reboots.

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