https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535
--- Comment #30 from Andrey V. Elsukov <a...@freebsd.org> ---
(In reply to Hans Petter Selasky from comment #27)
> Created attachment 200956 [details]
> Fix MLD refcounting in IPv6 code.
>
> Hi,
>
> Please test this patch while watching:
>
> vmstat -m | grep multi
It still leaks. The memory leak is unimportant problem. The much worse is that
system leaves multicast groups when you do an address configuration several
times. When system leaves multicast groups, it stops respond to ND6 NS, and
becomes unresponsive for neighbors.
# vmstat -m | grep multi
ether_multi 61 5K - 135 16,32,64,128
in_multi 2 1K - 3 256
in6_multi 33 6K - 73 32,256
# ifmcstat -i re0
re0:
inet 10.9.8.12
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff01::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
# ifconfig re0 inet6 fc00::1
# vmstat -m | grep multi
ether_multi 76 6K - 150 16,32,64,128
in_multi 2 1K - 3 256
in6_multi 39 7K - 81 32,256
# ifmcstat -i re0
re0:
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff02::2:d4f1:c447%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:d4:f1:c4:47
group ff02::2:ffd4:f1c4%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:ff:d4:f1:c4
group ff02::1:ff00:1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:ff:00:00:01
inet 10.9.8.12
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff01::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
# ifconfig re0 inet6 fc00::1
# vmstat -m | grep multi
ether_multi 70 6K - 165 16,32,64,128
in_multi 2 1K - 3 256
in6_multi 36 6K - 89 32,256
# ifmcstat -i re0
re0:
inet 10.9.8.12
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff01::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
# ifconfig re0 inet6 fc00::1
# vmstat -m | grep multi
ether_multi 85 7K - 180 16,32,64,128
in_multi 2 1K - 3 256
in6_multi 42 7K - 97 32,256
# ifmcstat -i re0
re0:
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff02::2:d4f1:c447%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:d4:f1:c4:47
group ff02::2:ffd4:f1c4%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:ff:d4:f1:c4
group ff02::1:ff00:1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:ff:00:00:01
inet 10.9.8.12
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff01::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
# ifconfig re0 inet6 fc00::1
# ifmcstat -i re0
re0:
inet 10.9.8.12
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::1ebd:b9ff:fede:d7d%re0 scopeid 0x2
mldv1 flags=2<USEALLOW>
group ff01::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%re0 scopeid 0x2 mode exclude
mcast-macaddr 33:33:00:00:00:01
# vmstat -m | grep multi
ether_multi 79 6K - 195 16,32,64,128
in_multi 2 1K - 3 256
in6_multi 39 7K - 105 32,256
....
# vmstat -m | grep multi
ether_multi 127 10K - 315 16,32,64,128
in_multi 2 1K - 3 256
in6_multi 56 11K - 169 32,256
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