r0 = socket$inet6_udp(0xa, 0x2, 0x0)
r1 = dup(r0)
sendmmsg$inet6(r1, &(0x7f00000010c0)=[{{&(0x7f0000000080)={0xa, 0x4e23, 0x0, @mcast1, 0x4}, 0x1c, 0x0}}, {{0x0, 0x0, &(0x7f0000000340)=[{&(0x7f0000000240)="c6", 0x1}], 0x1}}], 0x2, 0x4c085)