Fatal Exception in RCTCxxBridge.mm after migrating to New Architecture

[janakivnair]

Description

• A non-std C++ exception is reported by Crashlytics for 5% of the users after migrating the app to new Architecture. Please note that it is not reproducible on debug builds and happens rarely in lower environments.
• The issue occurs on load of the app and repeats for the same user on the app downloaded from appstore
• The issue is reported only on iOS builds

Steps to reproduce

• Note that the issue is not commonly reproducible and gets reported by Crashlytics for around 5% of the total users.
• Would help if we could get any pointers towards fixing the issue as this is bringing our Crash-free % down.

React Native Version

0.73.10

Affected Platforms

Runtime - iOS

Areas

Bridgeless - The New Initialization Flow

Output of npx react-native info

System:
  OS: macOS 14.5
  CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
  Memory: 788.16 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.12.2
    path: ~/.nvm/versions/node/v20.12.2/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.nvm/versions/node/v20.12.2/bin/yarn
  npm:
    version: 10.5.0
    path: ~/.nvm/versions/node/v20.12.2/bin/npm
  Watchman:
    version: 2024.04.01.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.14.3
    path: /Users/janaki_nair/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.0
      - iOS 18.0
      - macOS 15.0
      - tvOS 18.0
      - visionOS 2.0
      - watchOS 11.0
  Android SDK:
    API Levels:
      - "30"
      - "31"
      - "32"
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 30.0.2
      - 30.0.3
      - 33.0.0
      - 33.0.1
      - 34.0.0
    System Images:
      - android-33 | Intel x86_64 Atom
      - android-33 | Google APIs ARM 64 v8a
      - android-33 | Google APIs Intel x86_64 Atom
      - android-33 | Google Play Intel x86_64 Atom
      - android-34 | Google APIs Intel x86_64 Atom
      - android-34 | Google Play Intel x86_64 Atom
      - android-UpsideDownCakePrivacySandbox | Google Play Intel x86_64 Atom
    Android NDK: Not Found
IDEs:
  Android Studio: 2022.3 AI-223.8836.35.2231.10406996
  Xcode:
    version: 16.0/16A242d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.10
    path: /usr/local/opt/openjdk@17/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/janaki_nair/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.73.9
    wanted: 0.73.9
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

# Crashlytics - Stack trace
# Application: com.tractorsupply.CMA
# Platform: apple
# Version: 1.46.3 (192)
# Issue: 8e01f2f4aebf12a4aadb4c677526d884
# Session: e0c7970084084dd98a138a4286fb259f_DNE_0_v2
# Date: Thu Oct 17 2024 06:49:32 GMT-0400 (Eastern Daylight Time)

Fatal Exception: RCTFatalException: non-std C++ exception
0  CoreFoundation                 0x9e88 __exceptionPreprocess
1  libobjc.A.dylib                0x178d8 objc_exception_throw
2  TSC                            0x6b2f88 RCTFormatError + 167 (RCTAssert.m:167)
3  TSC                            0x6ca740 -[RCTCxxBridge handleError:] + 1123 (RCTCxxBridge.mm:1123)
4  TSC                            0x6c90a0 __34-[RCTCxxBridge _initializeBridge:]_block_invoke + 668 (RCTCxxBridge.mm:668)
5  TSC                            0x6dd080 facebook::react::RCTMessageThread::tryFunc(std::__1::function<void ()> const&) + 72 (RCTMessageThread.mm:72)
6  TSC                            0x6dce2c invocation function for block in facebook::react::RCTMessageThread::runAsync(std::__1::function<void ()>) + 45 (RCTMessageThread.mm:45)
7  CoreFoundation                 0x43564 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__
8  CoreFoundation                 0xabd9c __CFRunLoopDoBlocks
9  CoreFoundation                 0x7bb98 __CFRunLoopRun
10 CoreFoundation                 0x80ed4 CFRunLoopRunSpecific
11 TSC                            0x6c6e30 +[RCTCxxBridge runRunLoop] + 332 (RCTCxxBridge.mm:332)
12 Foundation                     0x5b808 __NSThread__start__
13 libsystem_pthread.dylib        0x16cc _pthread_start
14 libsystem_pthread.dylib        0xba4 thread_start

com.apple.main-thread
0  UIKitCore                      0x327048 -[UIViewController _presentViewController:withAnimationController:completion:] + 1952
1  UIKitCore                      0x39d4e4 __63-[UIViewController _presentViewController:animated:completion:]_block_invoke_2 + 56
2  UIKitCore                      0x31564 +[UIView(Animation) performWithoutAnimation:] + 76
3  UIKitCore                      0x326860 __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 208
4  UIKitCore                      0x304984 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 396
5  UIKitCore                      0xd2af0 -[UIViewController _presentViewController:animated:completion:] + 188
6  UIKitCore                      0xd292c -[UIViewController presentViewController:animated:completion:] + 164
7  TSC                            0x52d0e0 +[RNBootSplash onJavaScriptDidLoad:] + 57 (RNBootSplash.m:57)
8  CoreFoundation                 0x37404 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 148
9  CoreFoundation                 0xde474 ___CFXRegistrationPost_block_invoke + 88
10 CoreFoundation                 0xc1724 _CFXRegistrationPost + 440
11 CoreFoundation                 0x4ba08 _CFXNotificationPost + 704
12 Foundation                     0x5cffc -[NSNotificationCenter postNotificationName:object:userInfo:] + 92
13 TSC                            0x6ca474 __53-[RCTCxxBridge executeSourceCode:withSourceURL:sync:]_block_invoke_2 + 1041 (RCTCxxBridge.mm:1041)
14 libdispatch.dylib              0x24b4 _dispatch_call_block_and_release + 32
15 libdispatch.dylib              0x3fdc _dispatch_client_callout + 20
16 libdispatch.dylib              0x127f4 _dispatch_main_queue_drain + 928
17 libdispatch.dylib              0x12444 _dispatch_main_queue_callback_4CF + 44
18 CoreFoundation                 0x9a6f8 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
19 CoreFoundation                 0x7c058 __CFRunLoopRun + 2036
20 CoreFoundation                 0x80ed4 CFRunLoopRunSpecific + 612
21 GraphicsServices               0x1368 GSEventRunModal + 164
22 UIKitCore                      0x3a23d0 -[UIApplication _run] + 888
23 UIKitCore                      0x3a2034 UIApplicationMain + 340
24 TSC                            0xb210 main + 18 (main.m:18)
25 ???                            0x1d2f88960 (Missing)

Thread
0  libsystem_kernel.dylib         0x1050 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0xe44 _pthread_wqthread + 364
2  libsystem_pthread.dylib        0xb98 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0x1050 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0xe44 _pthread_wqthread + 364
2  libsystem_pthread.dylib        0xb98 start_wqthread + 8

DTX_COMM_THREAD_8.277.1.1004
0  libsystem_kernel.dylib         0x1008 __semwait_signal + 8
1  libsystem_c.dylib              0x57d8 nanosleep + 220
2  Foundation                     0xb2b60 +[NSThread sleepForTimeInterval:] + 160
3  Dynatrace                      0x490c8 -[DTXCommunicationsManager(Private) run] + 3568
4  Foundation                     0x5b808 __NSThread__start__ + 716
5  libsystem_pthread.dylib        0x16cc _pthread_start + 148
6  libsystem_pthread.dylib        0xba4 thread_start + 8

DTX_DB_THREAD_8.277.1.1004
0  libsystem_kernel.dylib         0x1008 __semwait_signal + 8
1  libsystem_c.dylib              0x57d8 nanosleep + 220
2  Foundation                     0xb2b60 +[NSThread sleepForTimeInterval:] + 160
3  Dynatrace                      0xb9000 -[DTXDBManager(Private) run] + 1040
4  Foundation                     0x5b808 __NSThread__start__ + 716
5  libsystem_pthread.dylib        0x16cc _pthread_start + 148
6  libsystem_pthread.dylib        0xba4 thread_start + 8

DTX_AUA_THREAD_8.277.1.1004
0  libsystem_kernel.dylib         0x1008 __semwait_signal + 8
1  libsystem_c.dylib              0x57d8 nanosleep + 220
2  Foundation                     0xb2b60 +[NSThread sleepForTimeInterval:] + 160
3  Dynatrace                      0x6f624 -[DTXInternalActionManager autoUserActionThread:] + 148
4  Foundation                     0x5b808 __NSThread__start__ + 716
5  libsystem_pthread.dylib        0x16cc _pthread_start + 148
6  libsystem_pthread.dylib        0xba4 thread_start + 8

DTX_KSK_THREAD
0  libsystem_kernel.dylib         0x1008 __semwait_signal + 8
1  libsystem_c.dylib              0x57d8 nanosleep + 220
2  libsystem_c.dylib              0x19ad8 sleep + 52
3  Dynatrace                      0xe3fe0 monitorCachedData + 764
4  libsystem_pthread.dylib        0x16cc _pthread_start + 148
5  libsystem_pthread.dylib        0xba4 thread_start + 8

KSCrash Exception Handler (Secondary)
0  libsystem_kernel.dylib         0xb48 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x13008 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0xd1a0 thread_suspend + 112
3  Dynatrace                      0xeab98 handleExceptions + 164
4  libsystem_pthread.dylib        0x16cc _pthread_start + 148
5  libsystem_pthread.dylib        0xba4 thread_start + 8

KSCrash Exception Handler (Primary)
0  libsystem_kernel.dylib         0xb48 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x13008 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x13248 mach_msg_overwrite + 388
3  libsystem_kernel.dylib         0x108c mach_msg + 24
4  Dynatrace                      0xeac0c handleExceptions + 280
5  libsystem_pthread.dylib        0x16cc _pthread_start + 148
6  libsystem_pthread.dylib        0xba4 thread_start + 8

Reproducer

No reproducer since this is reported by Crashlytics for a percentage of users

Screenshots and Videos

Find attached package.json and complete stack trace of the crash
package.json
com.tractorsupply.CMA_issue_stacktrace.txt

[react-native-bot]

⚠️	Missing Reproducible Example
ℹ️	We could not detect a reproducible example in your issue report. Please provide either: If your bug is UI related: a Snack If your bug is build/update related: use our Reproducer Template. A reproducer needs to be in a GitHub repository under your username.

[react-native-bot]

⚠️

Newer Version of React Native is Available!

ℹ️

You are on a supported minor version, but it looks like there's a newer patch available - 0.73.10. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[react-native-bot]

⚠️	Missing Reproducible Example
ℹ️	We could not detect a reproducible example in your issue report. Please provide either: If your bug is UI related: a Snack If your bug is build/update related: use our Reproducer Template

[react-native-bot]

⚠️

Newer Version of React Native is Available!

ℹ️

You are on a supported minor version, but it looks like there's a newer patch available - undefined. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[janakivnair]

We are using 0.73.10 now. I have corrected the description.

[cipolleschi]

The error points to this line: https://github.com/facebook/react-native/blob/0.73-stable/packages/react-native/React/CxxBridge/RCTCxxBridge.mm#L1123

There is a fatal error few lines above with the error RCTJavaScriptDidFailToLoadNotification.
It looks like those clients are failing to load the JS bundle.

Are ou using any OTA mechanism like Expo updates/code push? Do you see these errors happening consistently from some specific devices, for some specific versions of the app?

It doesn't look like that the problem is in React Native, but it looks more like something in the JS bundle that makes it fail to load.

[janakivnair]

First of all, thanks a ton for responding so quickly.

No..We are not using any OTA mechanism. The errors are seen across all iOS devices from iPhone 12 to variants of iPhone 15. Below is the appStore link for the app. It would be of great help if you could look at ipa contents and see if there is anything which stands out.
https://apps.apple.com/us/app/tractor-supply/id1502197298
This issue started after we moved to new Architecture of RN. I will have a look at build scripts to see what has changed.