kern/76663: panic with FAST_IPSEC and IPv6

[Jean-Yves Lefort]

>Number:         76663
>Category:       kern
>Synopsis:       panic with FAST_IPSEC and IPv6
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jan 25 13:50:11 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Jean-Yves Lefort
>Release:        FreeBSD 5.3-RELEASE i386
>Organization:
>Environment:
System: FreeBSD jsite.lefort.net 5.3-RELEASE FreeBSD 5.3-RELEASE #0: Tue Jan 25 10:48:58 CET 2005 jylefort at jsite.lefort.net:/usr/obj/usr/src/sys/JSITE i386
>Description:
Reproducible panics on 5.3-RELEASE when using a FAST_IPSEC IPv6 tunnel
(the kernel panics when processing the first IPv6 packet), both with
mpsafenet=1 and mpsafenet=0. Removing the IPv6 entries from
/etc/ipsec.conf "fixes" the issue.
>How-To-Repeat:
add an IPsec v6 tunnel to /etc/ipsec.conf, eg:

add 2001:838:339::1 2001:838:339::2 esp 15700 -E blowfish-cbc "xxx";
add 2001:838:339::2 2001:838:339::1 esp 24500 -E blowfish-cbc "xxx";
spdadd 2001:838:339::2 ::/0 any -P out ipsec
        esp/tunnel/2001:838:339::2-2001:838:339::1/use;
spdadd ::/0 2001:838:339::2 any -P out ipsec
        esp/tunnel/2001:838:339::1-2001:838:339::2/use;

$ /etc/rc.d/ipsec reload
$ ping6 www.kame.net
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: