r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000040)='/proc/keys\x00', 0x0, 0x0)
preadv2(r0, &(0x7f0000000380)=[{&(0x7f0000000080)=""/174, 0xae}], 0x1, 0x500, 0x0, 0x0)