netbsd-7 panic

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

hello,
I just got this:
panic: kernel diagnostic assertion "(m)->m_type != MT_FREE" failed: file "/dsk/l1/misc/bouyer/netbsd-7/src/sys/kern/uipc_mbuf.c", line 652 
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
kern_assert() at netbsd:kern_assert+0x4f
m_freem() at netbsd:m_freem+0xa7
ipf_fastroute() at netbsd:ipf_fastroute+0x397
ipf_send_ip() at netbsd:ipf_send_ip+0x13c
ipf_send_icmp_err() at netbsd:ipf_send_icmp_err+0x1fa
ipf_check() at netbsd:ipf_check+0x88c
pfil_run_hooks() at netbsd:pfil_run_hooks+0xc4
ip6_input() at netbsd:ip6_input+0x1bb
ip6intr() at netbsd:ip6intr+0x45
softint_dispatch() at netbsd:softint_dispatch+0xd3

This is netbsd-7/amd64 as of early february.
Does it ring a bell to someone ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--