r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/schedstat\x00', 0x0, 0x0)
preadv2(r0, &(0x7f0000000400)=[{&(0x7f0000000180)=""/172, 0xac}], 0x1, 0x0, 0x0, 0x0)