r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmsg$inet6(r0, &(0x7f0000000180)={&(0x7f0000000040)={0xa, 0x4e21, 0x0, @mcast2, 0x4}, 0x1c, 0x0, 0x0, &(0x7f0000000140)=[@flowinfo={{0x14, 0x29, 0xb, 0x1f8000}}], 0x18}, 0x0)