kern/52353: [netbsd-8] A crash in icmpv6 code (?)

[dmb%yenn.ulegend.net@localhost]

>Number:         52353
>Category:       kern
>Synopsis:       NetBSD 8 kernel crashed after a few days of uptime, possibly ICMPv6 kernel code involved
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jul 01 13:40:00 +0000 2017
>Originator:     Dominik Bialy
>Release:        NetBSD 8.0_BETA
>Organization:
Underlegend Networks
>Environment:
System: NetBSD yenn 8.0_BETA NetBSD 8.0_BETA (YENN) #6: Mon Jun 26 08:49:07 UTC 2017 builds@yenn:/var/obj/sys/arch/amd64/compile/YENN amd64
Architecture: x86_64
Machine: amd64
>Description:
yenn# crash -M netbsd.3.core -N netbsd.3
Crash version 8.0_BETA, image version 8.0_BETA.
System panicked: in6_cksum: mbuf too short for IPv6 header
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NARCNET() at 0
?() at fffffe80a11bcc00
vpanic() at vpanic+0x149
snprintf() at snprintf
in6_cksum() at in6_cksum+0x1a2
_icmp6_input() at _icmp6_input+0xb4
wqinput_work() at wqinput_work+0x88
workqueue_worker() at workqueue_worker+0xbc

yes, IPv6 is via gif(4), but _before_ the patch for MP-fy
>How-To-Repeat:
	possibly ping the machine for some time (?) with IPv6 on a gif(4) (?)
>Fix:
	I don't know