pipe(&(0x7f0000000040)={0xffffffffffffffff, <r0=>0xffffffffffffffff})
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000000)={0xffffffffffffffff, <r1=>0xffffffffffffffff})
splice(r1, 0x0, r0, 0x0, 0x801, 0x0)
write$tun(r0, 0x0, 0x38)