r0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./file0\x00', 0x46e2, 0x0)
r1 = creat(&(0x7f0000000040)='./file0\x00', 0x0)
lseek(r0, 0x800, 0x0)
pwrite64(r1, &(0x7f00000001c0)="b3", 0x1, 0x8000)
sendfile(r1, r0, 0x0, 0xffffffff000)