r0 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000080)='net/fib_trie\x00')
preadv(r0, &(0x7f0000000040)=[{&(0x7f00000000c0)=""/4096, 0x1000}], 0x1, 0x5, 0x0)