r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000000)='/proc/mdstat\x00', 0x0, 0x0)
preadv(r0, &(0x7f0000001f40)=[{&(0x7f0000001e80)=""/181, 0x11}], 0x1, 0x0, 0x0)