[🐛] NSGenericException - *** Collection <__NSDictionaryM: <address>> was mutated while being enumerated.

[sandesh-wadal]

Issue

Describe your issue here

We are using react-native firebase version 20.5.0.
Getting this crash on firebase console for iOS:

• NSGenericException - *** Collection <__NSDictionaryM: <address>> was mutated while being enumerated.

Stacktrace file

Fatal Exception: NSGenericException
0  CoreFoundation                 0x2d5ec __exceptionPreprocess
1  libobjc.A.dylib                0x31244 objc_exception_throw
2  CoreFoundation                 0x17a28c -[__NSSingleObjectEnumerator init]
3  CoreFoundation                 0x29b14 -[NSDictionary containsObject:]
4  libloader                      0x6ee4d4 (Missing UUID d0f48e669ff2341e9ad39a5779f6a7ff)
5  libloader                      0x77a970 (Missing UUID d0f48e669ff2341e9ad39a5779f6a7ff)
6  libloader                      0x6ee270 (Missing UUID d0f48e669ff2341e9ad39a5779f6a7ff)
7  libloader                      0xe6f730 (Missing UUID d0f48e669ff2341e9ad39a5779f6a7ff)
8  libloader                      0x20b988 (Missing UUID d0f48e669ff2341e9ad39a5779f6a7ff)
9  libloader                      0xe9afbc (Missing UUID d0f48e669ff2341e9ad39a5779f6a7ff)
10 libsystem_pthread.dylib        0x17d0 _pthread_start
11 libsystem_pthread.dylib        0x1480 thread_start

com.apple.main-thread
0  libobjc.A.dylib                0x25368 cache_t::shouldFlush(objc_selector*, void (*)()) const + 44
1  libobjc.A.dylib                0x25310 invocation function for block in flushCaches(objc_class*, char const*, bool (objc_class*) block_pointer) + 40
2  libobjc.A.dylib                0x25068 flushCaches(objc_class*, char const*, bool (objc_class*) block_pointer) + 224
3  libobjc.A.dylib                0x26f98 _method_setImplementation(objc_class*, method_t*, void (*)()) + 328
4  libobjc.A.dylib                0x269e0 method_setImplementation + 136
5  kmbmobile                      0x1d515c -[FIRMessagingRemoteNotificationsProxy unswizzleSelector:inClass:] + 338 (FIRMessagingRemoteNotificationsProxy.m:338)
6  kmbmobile                      0x1d4894 -[FIRMessagingRemoteNotificationsProxy unswizzleUserNotificationCenterDelegate:] + 186 (FIRMessagingRemoteNotificationsProxy.m:186)
7  kmbmobile                      0x1d4c5c -[FIRMessagingRemoteNotificationsProxy observeValueForKeyPath:ofObject:change:context:] + 241 (FIRMessagingRemoteNotificationsProxy.m:241)
8  Foundation                     0x48e44 NSKeyValueNotifyObserver + 252
9  Foundation                     0x48b38 NSKeyValueDidChange + 384
10 Foundation                     0x478e8 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:maybeNewValuesDict:usingBlock:] + 740
11 Foundation                     0x141390 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] + 64
12 Foundation                     0x140998 _NSSetObjectValueAndNotify + 404
13 kmbmobile                      0x3f68d8 __48-[RNFBMessagingUNUserNotificationCenter observe]_block_invoke + 60 (RNFBMessaging+UNUserNotificationCenter.m:60)
14 libdispatch.dylib              0x3fa8 _dispatch_client_callout + 20
15 libdispatch.dylib              0x57f4 _dispatch_once_callout + 32
16 kmbmobile                      0x3f6790 -[RNFBMessagingUNUserNotificationCenter observe] + 85 (once.h:85)
17 kmbmobile                      0x3f5990 -[RNFBMessagingNSNotificationCenter application_onDidFinishLaunchingNotification:] + 76 (RNFBMessaging+NSNotificationCenter.m:76)
18 CoreFoundation                 0x4e478 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 148
19 CoreFoundation                 0x4e394 ___CFXRegistrationPost_block_invoke + 88
20 CoreFoundation                 0x4cf08 _CFXRegistrationPost + 436
21 CoreFoundation                 0x4c00c _CFXNotificationPost + 728
22 Foundation                     0x9f50c -[NSNotificationCenter postNotificationName:object:userInfo:] + 92
23 UIKitCore                      0x478e48 -[UIApplication _callInitializationDelegatesWithActions:forCanvas:payload:fromOriginatingProcess:] + 3244
24 UIKitCore                      0x29a64c -[UIApplication _runWithMainScene:transitionContext:completion:] + 960
25 UIKitCore                      0x44c1a8 -[_UISceneLifecycleMultiplexer completeApplicationLaunchWithFBSScene:transitionContext:] + 132
26 UIKitCore                      0x24f680 _UIScenePerformActionsWithLifecycleActionMask + 112
27 UIKitCore                      0x3ef114 __101-[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]_block_invoke + 220
28 UIKitCore                      0x3eee24 -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:] + 216
29 UIKitCore                      0x1b5874 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 608
30 UIKitCore                      0x1b5594 -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:] + 248
31 UIKitCore                      0x1b504c __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke + 148
32 UIKitCore                      0x1b41f4 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:fromCurrentState:actions:completion:] + 736
33 UIKitCore                      0x1b382c _UISceneSettingsDiffActionPerformChangesWithTransitionContextAndCompletion + 224
34 UIKitCore                      0x1b34dc -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:] + 316
35 UIKitCore                      0x24f430 __64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke.229 + 612
36 UIKitCore                      0x24ed80 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 208
37 UIKitCore                      0x2467a4 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 244
38 UIKitCore                      0x22ea94 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 456
39 UIKitCore                      0x22cfa0 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 288
40 FrontBoardServices             0xc00c __95-[FBSScene _callOutQueue_didCreateWithTransitionContext:alternativeCreationCallout:completion:]_block_invoke + 288
41 FrontBoardServices             0x9834 -[FBSScene _callOutQueue_coalesceClientSettingsUpdates:] + 68
42 FrontBoardServices             0xb794 -[FBSScene _callOutQueue_didCreateWithTransitionContext:alternativeCreationCallout:completion:] + 436
43 FrontBoardServices             0x1fc94 __93-[FBSWorkspaceScenesClient _callOutQueue_sendDidCreateForScene:transitionContext:completion:]_block_invoke.197 + 276
44 FrontBoardServices             0x1f4c8 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 168
45 FrontBoardServices             0x2eb90 -[FBSWorkspaceScenesClient _callOutQueue_sendDidCreateForScene:transitionContext:completion:] + 468
46 libdispatch.dylib              0x3fa8 _dispatch_client_callout + 20
47 libdispatch.dylib              0x79f0 _dispatch_block_invoke_direct + 284
48 FrontBoardServices             0x18378 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 52
49 FrontBoardServices             0x182f8 -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible] + 240
50 FrontBoardServices             0x181d0 -[FBSMainRunLoopSerialQueue _performNextFromRunLoopSource] + 28
51 CoreFoundation                 0x73f3c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
52 CoreFoundation                 0x73ed0 __CFRunLoopDoSource0 + 176
53 CoreFoundation                 0x76b30 __CFRunLoopDoSources0 + 244
54 CoreFoundation                 0x75d2c __CFRunLoopRun + 840
55 CoreFoundation                 0xc8274 CFRunLoopRunSpecific + 588
56 GraphicsServices               0x14c0 GSEventRunModal + 164
57 UIKitCore                      0x3ee77c -[UIApplication _run] + 816
58 UIKitCore                      0x14e64 UIApplicationMain + 340
59 kmbmobile                      0x122ac main + 8 (main.m:8)
60 ???                            0x1b08ecde8 (Missing)

com.apple.UIKit.KeyboardManagement
0  libsystem_kernel.dylib         0x7bd0 __ulock_wait + 8
1  libdispatch.dylib              0x4998 _dlock_wait + 56
2  libdispatch.dylib              0x474c _dispatch_thread_event_wait_slow + 56
3  libdispatch.dylib              0x13ae8 __DISPATCH_WAIT_FOR_QUEUE__ + 368
4  libdispatch.dylib              0x13694 _dispatch_sync_f_slow + 148
5  UIKitCore                      0x3f0594 __37-[_UIRemoteKeyboards startConnection]_block_invoke_3 + 144
6  CoreFoundation                 0x2fe24 __invoking___ + 148
7  CoreFoundation                 0x2ee6c -[NSInvocation invoke] + 428
8  Foundation                     0xb7564 __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT__ + 16
9  Foundation                     0xb5f98 -[NSXPCConnection _decodeAndInvokeReplyBlockWithEvent:sequence:replyInfo:] + 532
10 Foundation                     0xb8fc0 __88-[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:]_block_invoke_5 + 188
11 libxpc.dylib                   0x1fc40 _xpc_connection_reply_callout + 116
12 libxpc.dylib                   0x12390 _xpc_connection_call_reply_async + 80
13 libdispatch.dylib              0x4028 _dispatch_client_callout3 + 20
14 libdispatch.dylib              0x21b64 _dispatch_mach_msg_async_reply_invoke + 340
15 libdispatch.dylib              0xb42c _dispatch_lane_serial_drain + 352
16 libdispatch.dylib              0xc158 _dispatch_lane_invoke + 432
17 libdispatch.dylib              0x1738c _dispatch_root_queue_drain_deferred_wlh + 288
18 libdispatch.dylib              0x16bd8 _dispatch_workloop_worker_thread + 540
19 libsystem_pthread.dylib        0x3680 _pthread_wqthread + 288
20 libsystem_pthread.dylib        0x1474 start_wqthread + 8

Project Files

Javascript

Click To Expand

package.json:

"@react-native-firebase/analytics": "20.5.0",
"@react-native-firebase/app": "20.5.0",
"@react-native-firebase/crashlytics": "20.5.0",
"@react-native-firebase/dynamic-links": "20.5.0",
"@react-native-firebase/messaging": "20.5.0",
"@react-native-firebase/perf": "20.5.0",

firebase.json for react-native-firebase v6:

{
    "react-native": {
      "crashlytics_debug_enabled": false,
      "crashlytics_is_error_generation_on_js_crash_enabled": true,
      "crashlytics_javascript_exception_handler_chaining_enabled": true
    }
  }

iOS

Click To Expand

ios/Podfile:

• I'm not using Pods
• I'm using Pods and my Podfile looks like:

  pod 'FirebaseCrashlytics'

AppDelegate.m:

  [FIRApp configure];

---

Android

Click To Expand

Have you converted to AndroidX?

• my application is an AndroidX application?
• I am using android/gradle.settings jetifier=true for Android compatibility?
• I am using the NPM package jetifier for react-native compatibility?

android/build.gradle:

// N/A

android/app/build.gradle:

// N/A

android/settings.gradle:

// N/A

MainApplication.java:

// N/A

AndroidManifest.xml:

<!-- N/A -->

---

Environment

Click To Expand

react-native info output:

System:
  OS: macOS 14.6.1
  CPU: (10) arm64 Apple M1 Pro
  Memory: 54.13 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.16.0
    path: /opt/homebrew/opt/node@20/bin/node
  Yarn:
    version: 1.22.19
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.8.1
    path: /opt/homebrew/opt/node@20/bin/npm
  Watchman:
    version: 2024.08.12.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.1
      - iOS 18.1
      - macOS 15.1
      - tvOS 18.1
      - visionOS 2.1
      - watchOS 11.1
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.1 AI-231.9392.1.2311.11330709
  Xcode:
    version: 16.1/16B40
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.7
    path: /usr/bin/javac
  Ruby:
    version: 3.3.4
    path: /opt/homebrew/opt/ruby/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 13.6.9
    wanted: ^13.6.3
  react:
    installed: 18.2.0
    wanted: ^18.2.0
  react-native:
    installed: 0.72.14
    wanted: 0.72.14
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found```

<!-- change `[ ]` to `[x]` to select an option(s) -->

- **Platform that you're experiencing the issue on**:
  - [ ] iOS
  - [ ] Android
  - [ ] **iOS** but have not tested behavior on Android
  - [ ] **Android** but have not tested behavior on iOS
  - [ ] Both
- **`react-native-firebase` version you're using that has this issue:**
  - `e.g. 5.4.3`
- **`Firebase` module(s) you're using that has the issue:**
  - `e.g. Instance ID`
- **Are you using `TypeScript`?**
  - `Y/N` & `VERSION`

</p>
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[mikehardy]

Hi there!

• If you are posting a crash please post the relevant stack trace
• Please do not post issues on outdated versions, update to current then reproduce in order to harvest the stack trace for examination

[mikehardy]

Also, this is a deliberate incomplete posting of information requested, which will likely lead to an incomplete effort to help - most likely not your desired outcome - suggest posting full contents:

[mikehardy]

I think we're going to need a reproduction for this one posted as a github repo we could clone and run to reproduce it

Why? As near as I can tell, the only uses of that collection should be safe in this context?

They are all here:

https://github.com/search?q=repo%3Afirebase%2Ffirebase-ios-sdk%20originalAppDelegateImps&type=code

I used a question mark because it should be the case multiple threads aren't going through there at once - the only time I could imagine that happening is if there was a race between init and dealloc somehow? Which seems tremendously unlikely and even then likely a coding error somehow ? (perhaps a notifications extension helper or something?

Would be useful along with a reproduction to know the frequency of this crash versus crash-free sessions