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

[venture37%geeklan.co.uk@localhost]

>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
>Release:        
>Organization:
>Environment:
NetBSD 8.99.4 i386
>Description:
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


bt:
https://pbs.twimg.com/media/DMIcmauWsAAsS0e.jpg:orig
>How-To-Repeat:
Connect to another host over firwire.
Configure IP addresses on fwip interfaces at each end
ifconfig fwip0 10.1.1.1/24 up

Ping remote host
ping 10.1.1.2

Run tcpdump to listen on fwip interface
tcpdump -i fwip0

After a minute or two, host should panic
>Fix: