r0 = socket$inet6(0xa, 0x1, 0x0)
r1 = socket$inet6(0xa, 0x1, 0x0)
r2 = dup3(r0, r1, 0x0)
setsockopt$inet6_group_source_req(r2, 0x29, 0x21, 0x0, 0x300)