r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmmsg$inet6(r0, &(0x7f0000006040)=[{{&(0x7f0000000000)={0xa, 0x4e24, 0x0, @mcast2}, 0x1c, 0x0}}, {{&(0x7f0000000340)={0xa, 0x0, 0x0, @ipv4={'\x00', '\xff\xff', @multicast2}}, 0x1c, 0x0}}], 0x2, 0x4048801)