r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000001d00)='/proc/mdstat\x00', 0x0, 0x0)
preadv(r0, &(0x7f0000000000)=[{&(0x7f0000001d40)=""/167, 0xa7}], 0x1, 0xfffffffa, 0x0)