r0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./cgroup/cgroup.procs\x00', 0x0, 0x0)
read(r0, &(0x7f00000001c0)=""/1, 0x56)
preadv(r0, &(0x7f0000000280)=[{&(0x7f0000000000)=""/48, 0x30}], 0x1, 0x0, 0x0)