socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000680)={0xffffffffffffffff, <r0=>0xffffffffffffffff})
r1 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./file1\x00', 0x882c2, 0x0)
mmap(&(0x7f0000000000/0xc00000)=nil, 0xc00000, 0x0, 0x1f012, r1, 0x0)
splice(r0, 0x0, r0, &(0x7f00000000c0), 0x8, 0x0)