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kern/52621: Running tcpdump on fwip(4) causes panic

>Number:         52621
>Category:       kern
>Synopsis:       Running tcpdump on fwip(4) causes panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 14 22:35:00 +0000 2017
>Originator:     Sevan Janiyan
NetBSD 8.99.4 i386
While investigate lack of communication reported in kern/52619, launching tcpdump -i fwip0 results in a panic.

On my i386 host, the message reported is:
kernel diagnostic assertion "!cpu_intr_p()" failed: file "/usr/src/sys/net/bpf.c", line 1579

Connect to another host over firwire.
Configure IP addresses on fwip interfaces at each end
ifconfig fwip0 up

Ping remote host

Run tcpdump to listen on fwip interface
tcpdump -i fwip0

After a minute or two, host should panic

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