r0 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000100)='net/fib_trie\x00')
preadv(r0, &(0x7f0000001580)=[{&(0x7f00000000c0)=""/28, 0x1c}], 0x1, 0x6, 0x0)