r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
r1 = signalfd(0xffffffffffffffff, &(0x7f0000000140), 0x8)
r2 = dup2(r0, r1)
recvmsg$unix(r2, &(0x7f00000002c0)={0x0, 0x0, 0x0}, 0x123)