https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221445
--- Comment #5 from Vladislav V. Prodan <ad...@support.od.ua> ---
A similar problem.
Hetzner data center.
The server is loaded into rescue mode with FreeBSD 12.0 x64.
[root@rescue ~]# uname -a
FreeBSD core.domain.com 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC
amd64
# I turn on ipv6
sysctl net.inet6.ip6.accept_rtadv=1
ifconfig igb0 inet6 2a01:4f8:241:XXXX::2/64
route -6 add default -iface igb0
# ping6 -c 4 ya.ru
PING6(56=40+8+8 bytes) 2a01:4f8:241:XXXX::2 --> 2a02:6b8::2:242
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=-1
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=-1
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=-1
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=-1
--- ya.ru ping6 statistics ---
4 packets transmitted, 0 packets received, 100.0% packet loss
[root@rescue ~]# ifconfig
igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=e507bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
ether 00:1e:67:b4:f9:e7
inet 116.202.XXX.XXX netmask 0xffffffc0 broadcast 116.202.XXX.XXX
inet6 2a01:4f8:241:XXXX::2 prefixlen 64
inet6 fe80::21e:67ff:feb4:f9e7%igb0 prefixlen 64 scopeid 0x1
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
inet 127.0.0.1 netmask 0xff000000
groups: lo
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
[root@rescue ~]# netstat -rn6
Routing tables
Internet6:
Destination Gateway Flags Netif
Expire
::/96 ::1 UGRS lo0
default 00:1e:67:b4:f9:e7 US igb0
::1 link#2 UH lo0
::ffff:0.0.0.0/96 ::1 UGRS lo0
2a01:4f8:241:XXXX::/64 link#1 U igb0
2a01:4f8:241:XXXX::2 link#1 UHS lo0
fe80::/10 ::1 UGRS lo0
fe80::%igb0/64 link#1 U igb0
fe80::21e:67ff:feb4:f9e7%igb0 link#1 UHS lo0
fe80::%lo0/64 link#2 U lo0
fe80::1%lo0 link#2 UHS lo0
ff02::/16 ::1 UGRS lo0
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