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Showing content from https://github.com/nodejs/node/issues/12115 below:

Node occasionally gives multiple files/folders the same inode · Issue #12115 · nodejs/node · GitHub

Moderator's note (@Fishrock123): Off-topic comments have and will be deleted.

• Version: v7.2.1
• Platform: Windows 10 Pro 64bit, Windows 7 Enterprise 64bit (Both using NTFS)
• Subsystem: File System

Node sometimes reports different files/folders to have identical ino values.
I can't reproduce this consistently and copying/reproducing a folder structure that contains dupes elsewhere doesn't replicate the issue.

I did encounter lots of duplicates under C:\Users\%USER%\AppData but it may be different for other people

Specific example I encountered

# Structure
│   ServerStore.jsx
│
├───constants
│       Api.jsx
│
└───stores
        UserStore.jsx

> fs.lstatSync("stores").ino
5910974511014218
> fs.lstatSync("stores/UserStore.jsx").ino
24206847997202570
> fs.lstatSync("constants").ino //Duplicate
9851624184963316
> fs.lstatSync("constants/Api.jsx").ino //Duplicate
9851624184963316
> fs.lstatSync("ServerStore.jsx").ino
3659174697792238

Here's a hacky node script to loop through a directory and look for duplicate inodes.
Running it on most of my other folders didn't yield a result, until I ran it on C:\Users\%USER%\AppData where I encounted loads of duplicates

Usage: node dupe.js [dir]

var fs = require('fs');
var path = require('path');
var process = require('process');

// Recursively walks a directory and looks for duplicate inodes
// loop from http://stackoverflow.com/questions/5827612/node-js-fs-readdir-recursive-directory-search

var dir = process.argv[2];
if (dir == undefined) {
    dir = '.';
}

var walk = function(dir, done) {

  var results = [];
  fs.readdir(dir, function(err, list) {

    if (err) return done(err);

    var pending = list.length;
    if (!pending) return done(null, results);

    list.forEach(function(file) {

      file = path.resolve(dir, file);
      fs.stat(file, function(err, stat) {
        if(stat && stat.ino) {
            results.push({
                file: file,
                ino: stat.ino
            });
        }

        if (stat && stat.isDirectory()) {
          walk(file, function(err, res) {
            if(res) {
               results = results.concat(res);
            }
            if (!--pending) done(null, results);
          });
        } 
        else {
          if (!--pending) done(null, results);
        }
      });
    });
  });
};

walk(dir, function(err, results) {
    var merge = {};
    results.forEach(function(it) {
        if (!merge[it.ino]) {
            merge[it.ino] = [];
        }
        merge[it.ino].push(it.file);
    });
    var dupes = Object.keys(merge).filter(key => merge[key].length > 1);

    dupes.forEach(it => console.log(it, merge[it]));
})

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