[Bug 208389] Netmap Panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208389

            Bug ID: 208389
           Summary: Netmap Panic
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: shawn.webb at hardenedbsd.org

When you run `tcpdump -ni netmap:em0` and em0 is not in Netmap mode and you
exit tcpdump (by hitting ^C), FreeBSD will panic.

Picture of panicking box here: https://goo.gl/photos/1fdTaMBFdit6ZkrP8

For some reason, doing a dump at the ddb prompt didn't produce a core.txt.
Here's info.txt:

Dump header from device: /dev/ada0s1b
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 710184960
  Blocksize: 512
  Dumptime: Tue Mar 29 15:37:43 2016
  Hostname: [sanitized]
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 11.0-CURRENT-HBSD #73
[DEVEL:HardenedBSD-CURRENT-amd64:427] d31c1ca(HEAD): Sun Mar 20 09:25:50 EDT
2016
    jenkins at nyi-01.build.hardenedbsd.org:/usr/obj/jenkins/workspace/HardenedBSD
 Panic String:
  Dump Parity: 3422855522
  Bounds: 0
  Dump Status: good

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