r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmmsg$inet6(r0, &(0x7f0000000200)=[{{&(0x7f0000000080)={0xa, 0x4e21, 0x0, @empty}, 0x1c, 0x0}}, {{&(0x7f0000000040)={0xa, 0x4e20, 0x0, @mcast1, 0x1}, 0x1c, 0x0}}], 0x2, 0x0)