PathAccessException: The process cannot access the file because it is being used by another process (Windows only) after breaking changes 9.0.0

[stan-at-work]

❗

After I updated to version 9.0.0, I randomly got an error saying: 'The process cannot access the file because it is being used by another process.'

This only happened after I upgraded to version 9.0.0.

I investigated the issue and came to the conclusion that it comes down to this.

If a file wants to read the same key at the same time as another file is writing to the same key, then I get this error.

I fixed this by switching back to the previous stable version.

I suggest updating the readme to alert users of this breaking issue.

This error also corrupts the .dat file, so all your secure storage is corrupted and unusable.

The error:

flutter: Failed to decrypt data: Error 0x00000057: Failure on CryptUnprotectData()
Delete corrupt file: c:\users\USER\appdata\roaming\com.example\APPNAME\flutter_secure_storage.dat
flutter: error on refresh token: PathAccessException: Cannot delete file, path = 'c:\users\USER\appdata\roaming\com.example\APPNAME\flutter_secure_storage.dat' (OS Error: The process cannot access the file because it is being used by another process.
flutter: , errno = 32) - stack: #0   _checkForErrorResponse (dart:io/common.dart:55:9)
flutter: #1   _File._delete.<anonymous closure> (dart:io/file_impl.dart:315:7)
flutter: #2   _rootRunUnary (dart:async/zone.dart:1407:47)
flutter: #3   _CustomZone.runUnary (dart:async/zone.dart:1308:19)
flutter: <asynchronous suspension>
flutter: #4   DpapiJsonFileMapStorage.load
flutter_secure_storage_windows_ffi.dart:267
flutter: <asynchronous suspension>
flutter: #5   FlutterSecureStorageWindows.write
flutter_secure_storage_windows_ffi.dart:142
flutter: <asynchronous suspension>
flutter: #6   CoreAuthRepo.toggleLoginEnvironmentInSecureStorage
core_auth_repo.dart:127
flutter: <asynchronous suspension>
flutter: #7   CoreAuthBloc._tryAutoLogin
core_auth_bloc.dart:113
flutter: <asynchronous suspension>
flutter: #8   Bloc.on.<anonymous closure>.handleEvent
bloc.dart:229
flutter: <asynchronous suspension>
flutter:

Greetings. Please fix ;-) 👍

Code example provided by: @ReinRaus

Example

import 'package:flutter/material.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';

late final FlutterSecureStorage storage;

void main() {
  storage = const FlutterSecureStorage();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    var controller = ScrollController();
    controller.addListener(
      () => storage.write(key: "key", value: "${controller.offset}"),
    );

    return MaterialApp(
      title: 'Scroll quickly to see the bug.',
      home: Scaffold(
        body: ListView(
          controller: controller,
          children: [for (int i = 0; i < 100; i++) Text("$i")],
        ),
      ),
    );
  }
}

[ReinRaus]

Code example: #603 (comment)

[stan-at-work]

@mogol

[KristijanMitrik]

Any updates on this issue @mogol ?

[stan-at-work]

Any updates on this issue @mogol ?

You can use the previous version.

[xenSlayer]

any update on this issue?

[xenSlayer]

@stan-at-work which previous version are you using to avoid this issue?

[stan-at-work]

@stan-at-work which previous version are you using to avoid this issue?

I'm using flutter_secure_storage: ^8.1.0

[rodrigoreal]

any update on this issue?

[stan-at-work]

Nope

[mikthemonster]

I have the same problem using flutter_secure_storage: ^9.2.2

[stan-at-work]

I have the same problem using flutter_secure_storage: ^9.2.2

+1 i had the same error today after a long time of not having it again.

[stan-at-work]

@mogol Any updates on this? the latest version and pub version had this critical bug.

[stan-at-work]

@mogol ?

[juliansteenbakker]

Hi all, could you please check if this issue still exists with version v10.0.0-beta.1? Also, if this is still an issue, please provide a step by step guide on how to recreate this issue. Then i can look into it.

[durukan-iscan]

Hello @juliansteenbakker,

I have same Problem (only Windows) but i do not see "Windows OS Changes" in v10.0.0-beta.1 or v10.0.0-beta.2

[juliansteenbakker]

v10.0.0-beta.1 does have changes for windows, however they are more related to the win32 implementation in flutter, and not about this problem i can see. I am going to look into this issue.

[stan-at-work]

v10.0.0-beta.1 does have changes for windows, however they are more related to the win32 implementation in flutter, and not about this problem i can see. I am going to look into this issue.

Hey,

I’m experiencing the same issue—it still persists.

There’s no specific pattern that I can recreate. It happens about once a day. I’ve noticed it tends to occur more often when in release mode.

I suspect it might be a race condition issue, possibly with locks not waiting for each other or something similar. But I’m not an expert. 😊

[nini22P]

Add multi storage file. It won't saved to a file at the same time.