panic: looutput: no header mbuf
Begin traceback...
lortrequest(c0864ce0,c1524400,cb49db04,c150e084,0) at netbsd:lortrequest
nd6_output(c0864ce0,c0864ce0,c1524400,cb49db04,c150e084) at netbsd:nd6_output+0x
d0
ip6_output(c1524400,0,cb49db00,4,0) at netbsd:ip6_output+0xf00
icmp6_reflect(c1524400,28,1,c,c1524600) at netbsd:icmp6_reflect+0x287 
icmp6_error(c1524600,1,4,0,cb49dd3c) at netbsd:icmp6_error+0x1bb
udp6_input(cb49dd90,cb49dd5c,11,1,0) at netbsd:udp6_input+0x1de
ip6_input(c1524600,2370,cb49ddb8,246,c08615a0) at netbsd:ip6_input+0x410
ip6intr(2370,c1524600,0,cb49de1c,c03c76de) at netbsd:ip6intr+0x86
DDB lost frame for netbsd:Xsoftnet+0x56, trying 0xcb49ddc0
Xsoftnet() at netbsd:Xsoftnet+0x56

This was, I think, while named was starting.