r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000500)='/proc/locks\x00', 0x0, 0x0)
preadv(r0, &(0x7f0000000280)=[{&(0x7f0000000540)=""/4096, 0x1000}], 0x1, 0x3ff, 0x0)