[Bug 202960] Kernel panic when bridging e1000 NIC with pf rules

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202960

            Bug ID: 202960
           Summary: Kernel panic when bridging e1000 NIC with pf rules
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jeffrey at endrift.com

Created attachment 160825
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=160825&action=edit
core.txt

When trying to set up a tap device for bhyve, I ran into a kernel panic with
some combination of the e1000 drivers for my Intel NIC and pf forwarding of
IPv6 packets. I was following the instructions on the bhyve page for setting up
the tap device and bridge:
https://www.freebsd.org/doc/handbook/virtualization-host-bhyve.html which
worked fine until I try to bring up the bridge, at which point it will panic
shortly after (presumably when it gets an IPv6 multicast packet).

The crash appears to be a bad interaction between the e1000 driver and
ip6_forward, where it panics when trying to log that it can't forward multicast
messages. The name of the interface in one of the mbufs is null, leading to a
fault when it tries to strlen the argument to kvprintf.

core.txt is attached.

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