r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmmsg$inet6(r0, &(0x7f0000000bc0)=[{{&(0x7f0000000080)={0xa, 0x4e20, 0x0, @mcast2}, 0x1b, 0x0}}], 0x1, 0x0)