r0 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./file1\x00', 0x882c2, 0x0)
fallocate(r0, 0x0, 0x0, 0x1000002)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff})
sendfile(r1, r0, 0x0, 0x100000001)