r0 = socket$inet6_udp(0xa, 0x2, 0x0)
sendmmsg$inet6(r0, &(0x7f0000000540)=[{{&(0x7f0000000240)={0xa, 0x4e21, 0x0, @mcast2}, 0x1c, 0x0, 0x0, &(0x7f0000000500)=[@dontfrag={{0x14}}], 0x18}}], 0x1, 0x4008040)