r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
r1 = socket$inet6_tcp(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000000)={@loopback, 0x0, 0x0, 0xff, 0x1, 0x0, 0x0, 0x5000000}, 0x20)
dup3(r0, r1, 0x0)