Potentially broken PIM checksum about pim6sd HOT 3 CLOSED

[NS:client0] <---> [NS:router0] <---> [NS:router1] <---> [NS:client1]

$ ip netns exec pimtest-router1 tcpdump -l -n -v -i wan0 pim
tcpdump: listening on wan0, link-type EN10MB (Ethernet), capture size 262144 bytes
20:33:58.537463 IP6 (flowlabel 0x13151, hlim 1, next-header PIM (103) payload length: 72) fe80::1 > ff02::d: PIMv2, length 72
        Bootstrap, cksum 0xd8cc (incorrect) tag=5b8 hashmlen=126 BSRprio=0 BSR=fd5c:725:2841::1 (group0: ff00::/8 RPcnt=1 FRPcnt=1 RP0=fd5c:725:2841::1,holdtime=2m30s,prio=0)
20:34:18.552348 IP6 (flowlabel 0x5b502, hlim 1, next-header PIM (103) payload length: 70) fe80::11:22ff:fe00:2 > ff02::d: PIMv2, length 70
        Hello, cksum 0xa47e (correct)
          Hold Time Option (1), length 2, Value: 1m45s
          DR Priority Option (19), length 4, Value: 1
          Generation ID Option (20), length 4, Value: 0x34658b7e
          Address List Option (24), length 18, Value: 
          Address List (Old) Option (65001), length 18, Value: 
20:34:18.552509 IP6 (flowlabel 0x13151, hlim 1, next-header PIM (103) payload length: 106) fe80::1 > ff02::d: PIMv2, length 106
        Hello, cksum 0xa335 (incorrect)
          Hold Time Option (1), length 2, Value: 1m45s
          DR Priority Option (19), length 4, Value: 1
          Generation ID Option (20), length 4, Value: 0x34658b7e
          Address List Option (24), length 36, Value: 
          Address List (Old) Option (65001), length 36, Value: 
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernel