r0 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='net/rt_cache\x00')
preadv(r0, &(0x7f00000000c0)=[{&(0x7f00000007c0)=""/4096, 0x1000}], 0x1, 0x8000, 0x0)