RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks #16376

antoinerousseau · 2017-10-15T10:55:38Z

I randomly get this warning at iOS app start (i.e. not always).

Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

OS: macOS Sierra 10.12.6
Node: 6.10.2
Yarn: 1.0.2
npm: 5.4.2
Watchman: 4.7.0
Xcode: Xcode 9.0 Build version 9A235
Android Studio: 2.1 AI-143.2915827

Packages: (wanted => installed)
react: ^16.0.0 => 16.0.0
react-native: ^0.49.3 => 0.49.3

Steps to Reproduce

Start the app

Expected Behavior

No warning

Actual Behavior

Reproducible Demo

N/A

Some packages I use

https://github.com/antoinerousseau/react-native-custom-components
https://github.com/rebeccahughes/react-native-device-info
https://github.com/evollu/react-native-fcm
https://github.com/gwmccull/react-native-polyfill
https://github.com/getsentry/react-native-sentry

almostintuitive · 2017-10-15T16:47:35Z

Same here!

eggybot · 2017-10-15T17:35:16Z

got this yellow issue for iOS

rizzomichaelg · 2017-10-15T20:34:19Z

I see this as well. Possibly related to #11196.
I believe this is what is also causing the app to crash when trying to reload; it fails with
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This method must not be called before the JS thread is created'

jozan · 2017-10-16T14:07:51Z

I'm also getting this error from time to time on iOS 11 and I've got no idea how to debug this to give more information. Stacktrace doesn't help at all in this case.

minikin · 2017-10-16T14:51:46Z

+1

mkozhukharenko · 2017-10-17T07:11:26Z

+1

antoinerousseau · 2017-10-17T11:28:05Z

Please stop adding +1s, this is generating email notifications that don't add any information. Use the "add reaction" feature instead.

dantman · 2017-11-07T21:27:31Z

Same issue. Here are the packages I use:

react-native-device-info
react-native-interactable
react-native-sensitive-info
react-native-snackbar
react-native-splash-screen
react-native-svg
react-native-vector-icons

Given the intersection with @antoinerousseau's list, the possible locations for this bug are:

A bug in react-native itself
A bug in react-native-device-info
Multiple bugs in libraries other than react-native-device-info

disjfa · 2017-11-08T16:03:59Z

I just added react-native-device-info, and moved from rn 0.49 to 0.50. and now i found this bug. Don't know if it's the problem, but it's when i got this.

MilkBiscuit · 2017-11-09T06:34:18Z

Same issue...
So it was not my fault ?

WhoJave · 2017-11-10T09:13:48Z

Same issue... Do u have any solutions ?

SMJ93 · 2017-11-14T14:12:44Z

Same issue. The only package from the list above we use is react-native-sentry.

bullantt · 2017-11-15T03:20:36Z

Same issue here today i have started a brand new app and only package i have added
"native-base": "^2.3.3",
"react": "16.0.0",
"react-native": "0.50.3",
"react-native-fcm": "^10.0.3"

fishmwei · 2017-11-16T14:58:24Z

@rizzomichaelg
+1
"react-native": "0.49.3",
app crashed when first load randomly.

anybody resolved it ??

thejacobseely · 2017-11-16T21:03:47Z

@dantman I started seeing the issue immediately after installing react-native-device-info, so I highly suspect the issue is related, at least in our case, to that specific package.

The only other package I am using react-native-keychain, which I installed quite a while ago without any issues, so it seems like a good bet.

ahanriat · 2017-11-19T13:35:32Z

👀
react-native-device-info/react-native-device-info#260

dantman · 2017-11-20T06:07:35Z

react-native-device-info/react-native-device-info#260 seems to have a message referring to RNDeviceInfo while this bug refers to RCTDevLoadingView. So there may be more than one spot triggering this warning.

mattijsf · 2017-11-28T20:04:20Z

If you would put a breakpoint on the following line:

RCTLogWarn(@"RCTBridge required dispatch_sync to load %@. This may lead to deadlocks", _moduleClass);

You can see which module/stack is responsible for loading RCTDevLoadingView in my case it was RCTCxxBridge.mm which was loading the remote bundle and reporting the download progress on RCTDevLoadingView:

... onProgress:^(RCTLoadingProgress *progressData) {
#if RCT_DEV && __has_include("RCTDevLoadingView.h")
      RCTDevLoadingView *loadingView = [weakSelf moduleForClass:[RCTDevLoadingView class]];
      [loadingView updateProgress:progressData];
#endif
    }];

Here the RCTCxxBridge is using moduleForClass which will load an instance of the module if it is not yet available. Due to the queue used for the onProgress block RCTDevLoadingView would be loaded on a non-main queue, while RCTDevLoadingView requires a main-queue setup.

I was able to workaround the warning by optimistically load RCTDevLoadingView by returning an instance from my RCTBridgeDelegate using:
- (NSArray<id<RCTBridgeModule>> *)extraModulesForBridge:(RCTBridge *)bridge;

grossingdev · 2017-12-10T03:49:08Z

I was able to workaround the warning by updating AppDelegate.m

#if RCT_DEV
#import <React/RCTDevLoadingView.h>
#endif
...
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  ...
  RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:jsCodeLocation
                                            moduleProvider:nil
                                             launchOptions:launchOptions];
#if RCT_DEV
  [bridge moduleForClass:[RCTDevLoadingView class]];
#endif
  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                                   moduleName:@"Test"
                                            initialProperties:nil];
  ...
}

rskull · 2017-12-15T10:09:40Z

react-native: 0.50.4
same issue...

6axter82 · 2017-12-15T10:29:50Z

react-native: 0.51.0
same issue...

pigflymoon · 2018-01-10T03:15:51Z

"react": "16.2.0",
"react-native": "0.52.0",
same issue...

berkcoker · 2018-01-17T03:16:47Z

"react": "16.2.0",
"react-native": "0.51.0",
"react-native-device-info": "0.13.0"

My solution here was to move react-native-device-info out of the pod file and link it manually in the project. That seemed to solve the issue. I think another approach could be to include CxxBridge as a subspec for React in the pod file, but that requires Folly (and so boost), and that whole setup is cumbersome / takes long time. If you want a quick fix, simply remove the packages that are causing the issue out of pod.

akvsh-r · 2018-03-17T12:17:15Z

No "react-native-device-info" installed:
Issue exists in 0.54.2 :

"react": "16.3.0-alpha.2",
"react-native": "0.54.2",
"react-native-action-button": "^2.8.4",
"react-native-admob": "^2.0.0-beta.4",
"react-native-animatable": "^1.2.4",
"react-native-awesome-alerts": "^1.0.7",
"react-native-elements": "^0.19.0",
"react-native-fbsdk": "^0.7.0",
"react-native-linear-gradient": "^2.4.0",
"react-native-parallax-scroll-view": "^0.21.0",
"react-native-photo-grid": "0.0.2",
"react-native-responsive-dimensions": "^1.0.2",
"react-native-snap-carousel": "^3.6.0",
"react-native-vector-icons": "^4.5.0",
"react-navigation": "^1.5.7"

akvsh-r · 2018-03-17T12:32:02Z

It was with the "react-native-action-button": "^2.8.4", Adding shadowStyle={{shadowOpacity: 0.9}} solved the warning..

wellyshen · 2018-03-19T17:04:10Z

Same issue here.

avinashwigroup · 2018-04-02T12:24:58Z

Same issue.
RN 0.54.4

SkrewEverything · 2018-04-05T01:52:26Z

Anybody got the solution?

The error comes even for freshly/newly created project.

"react": "16.3.1",
"react-native": "0.54.4"

yogu2017 · 2018-04-09T13:16:25Z

same

MikeSilvis · 2018-04-13T20:39:37Z

+1

@antoinerousseau any update on this issue?

RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks facebook/react-native#16376

ivantacca · 2021-08-02T13:31:20Z

Add this in your /ios/YourAppName/AppDelegate.m, right after #import "AppDelegate.h"

#if RCT_DEV
#import <React/RCTDevLoadingView.h>
#endif

safaiyeh · 2021-08-02T19:46:07Z

If you are getting one of these errors:
RCTBridge required dispatch_sync to load RCTDevLoadingView
Use of undeclared identifier 'jsCodeLocation'
Use of undeclared identifier 'RCTDevLoadingView'

Here's a full solution:
Update the app-name/ios/AppName/AppDelegate.m file with following

#import "AppDelegate.h"

// NEW CODE

// put this condition after AppDelegate.h import
#if RCT_DEV
#import <React/RCTDevLoadingView.h>
#endif

// END

#import <React/RCTBridge.h>
#import <React/RCTBundleURLProvider.h>
#import <React/RCTRootView.h>
...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  // NEW CODE

  NSURL *jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.js" fallbackResource:nil];

  RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:jsCodeLocation
                                              moduleProvider:nil
                                               launchOptions:launchOptions];
  #if RCT_DEV
   [bridge moduleForClass:[RCTDevLoadingView class]];
  #endif

  // END

  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                                   moduleName:@"TempleWallet"
                                            initialProperties:nil];
  ...

Feel free to open a PR for this!

KrisLau · 2021-08-04T21:32:09Z

If you are getting one of these errors:
RCTBridge required dispatch_sync to load RCTDevLoadingView
Use of undeclared identifier 'jsCodeLocation'
Use of undeclared identifier 'RCTDevLoadingView'

Here's a full solution:
Update the app-name/ios/AppName/AppDelegate.m file with following

#import "AppDelegate.h"

// NEW CODE

// put this condition after AppDelegate.h import
#if RCT_DEV
#import <React/RCTDevLoadingView.h>
#endif

// END

#import <React/RCTBridge.h>
#import <React/RCTBundleURLProvider.h>
#import <React/RCTRootView.h>
...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  // NEW CODE

  NSURL *jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.js" fallbackResource:nil];

  RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:jsCodeLocation
                                              moduleProvider:nil
                                               launchOptions:launchOptions];
  #if RCT_DEV
   [bridge moduleForClass:[RCTDevLoadingView class]];
  #endif

  // END

  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                                   moduleName:@"TempleWallet"
                                            initialProperties:nil];
  ...

Doing this seems to mess up expo unimodules for me. My error is coming from https://github.com/Andr3wHur5t/react-native-keyboard-spacer so I might just uninstall that

haibert · 2021-10-19T16:29:48Z

Guys i'm getting this in Expo v43. My app works in development with my custom dev client but crashes in production. Does anyone know what the solution is for expo users? id greatly appreciate any guidance. #14766

mwegener-com · 2021-11-03T14:54:03Z

same problem in expo dev client.
@haibert do you have any solution?

haibert · 2021-11-03T17:06:51Z

@mwegener-com according to some people it is fixable modifying the App.Delegate.m. Mentioned by @safaiyeh for example. To modify this you can use the withAppDelegate from @expo/config-plugins to make the modifications. it'll look something like this.

// in your project root directory create filed named withIosAppDelegate.js 
const { withAppDelegate } = require('@expo/config-plugins')

const modAppDelegate = (content) => {
// modify content of AppDelegate.m here and return it, its basic string manipulation.
// you can also console.log things here to see your code is doing
    return content
}

module.exports = (config) => {
    return withAppDelegate(config, async (config) => {
// the line below will feed the content of the AppDelegate.m to your function made above ^ "modAppDelegate", from there you will conduct needed manipulations and return it.
        config.modResults.contents = modAppDelegate(config.modResults.contents)
        return config
    })
}

// in your app.js
{
    "expo": {
     ...
        "plugins": [
            "./withIosAppDelegate.js"
        ]
    }
}

then make sure you make a commit and run expo prebuild -p ios --clean
this will apply your changes to the AppDelegate.m and if you are console logging things you will see your changes made
if the changes are made correctly go ahead and build your new build and you are set.

trying to learn how to create a plugin by reading the expo docs is very confusing but I was taught by someone who knew how to use them and I hope this helps. Basically you are passed the content of the native file you need to manipulate as a string, and you must use regex or any means to do string manipulation and add or remove the lines of code you want, then simply return the string. docs

btw I have been able to avoid any problems by first launching the dev client on the simulator or my phone and THEN pressing i on my console to run the project, this way the dev client doesn't crash.. if this works for you you wont even need to do any of the step above..

mwegener-com · 2021-11-03T17:12:09Z

@haibert It wouldn't be my first config plugin, but have you already finished it and might share your solution?

haibert · 2021-11-03T18:46:07Z

@mwegener-com I have not created a config plug in because even though the warning comes I rarely get any crashes because of it. If you do create it I would appreciate the share

vbylen · 2021-11-19T19:32:40Z

I'm getting the same error

fritzfr · 2021-11-23T14:29:06Z

I have no idea what the meaning of the warning is, but this makes it go away:

https://amanhimself.dev/blog/rctbridge-required-dispatch-sync-to-load-warning/

liquidvisual · 2022-03-15T00:05:38Z

None of this works in 2022, on a fresh install of React Native 0.67.3

billnbell · 2022-03-20T23:36:41Z

0.67.3 this does not help. What does it mean?

W-Lawless · 2022-04-21T21:09:34Z

Hello,

Using "react-native": "0.64.3" I am seeing this issue after installing a native module (Agora Livestreaming SDK) and running expo run:ios Mac Monterey & Xcode 13.3

I added two string values to Info.plist for the enable mic/camera permission text.

Besides that I have no other modules in project, and only imported expo libraries such as blurview for basic layout features.

I am seeing this issue now on loading the app through Metro now that I am in a bare workflow

l2aelba · 2022-06-14T06:38:23Z

I'm from 2030 and this still does not fix. 😏

Nziranziza · 2022-07-24T18:52:42Z

I am experiencing the same issue as well

YaoHuiJi · 2022-09-28T10:51:52Z

... a new created 0.70.1 project has this issue too, it's funny, cause my 4 years old project doesn't have this issue.

I wonder is it safe to ignore this warning?

github-actions · 2023-03-27T12:01:35Z

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.

github-actions · 2023-04-03T18:01:05Z

This issue was closed because it has been stalled for 7 days with no activity.

leotm added a commit to leotm/react-native-template-new-architecture that referenced this issue Jul 17, 2021

Address RCTLog console warning

0b67d61

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Closed

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Closed

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RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks #16376

RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks #16376

Comments

antoinerousseau commented Oct 15, 2017 • edited

Is this a bug report?

Have you read the Contributing Guidelines?

Environment

Steps to Reproduce

Expected Behavior

Actual Behavior

Reproducible Demo

Some packages I use

almostintuitive commented Oct 15, 2017

eggybot commented Oct 15, 2017

rizzomichaelg commented Oct 15, 2017

jozan commented Oct 16, 2017

minikin commented Oct 16, 2017

mkozhukharenko commented Oct 17, 2017

antoinerousseau commented Oct 17, 2017

dantman commented Nov 7, 2017

disjfa commented Nov 8, 2017

MilkBiscuit commented Nov 9, 2017

WhoJave commented Nov 10, 2017

SMJ93 commented Nov 14, 2017

bullantt commented Nov 15, 2017

fishmwei commented Nov 16, 2017 • edited

thejacobseely commented Nov 16, 2017 • edited

ahanriat commented Nov 19, 2017

dantman commented Nov 20, 2017

mattijsf commented Nov 28, 2017 • edited

grossingdev commented Dec 10, 2017 • edited

rskull commented Dec 15, 2017

6axter82 commented Dec 15, 2017

pigflymoon commented Jan 10, 2018

berkcoker commented Jan 17, 2018 • edited

akvsh-r commented Mar 17, 2018

akvsh-r commented Mar 17, 2018

wellyshen commented Mar 19, 2018

avinashwigroup commented Apr 2, 2018

SkrewEverything commented Apr 5, 2018

yogu2017 commented Apr 9, 2018

MikeSilvis commented Apr 13, 2018 • edited

ivantacca commented Aug 2, 2021

safaiyeh commented Aug 2, 2021

KrisLau commented Aug 4, 2021 • edited

haibert commented Oct 19, 2021

mwegener-com commented Nov 3, 2021 • edited

haibert commented Nov 3, 2021 • edited

mwegener-com commented Nov 3, 2021 • edited

haibert commented Nov 3, 2021 • edited

vbylen commented Nov 19, 2021

fritzfr commented Nov 23, 2021

liquidvisual commented Mar 15, 2022

billnbell commented Mar 20, 2022

W-Lawless commented Apr 21, 2022 • edited

l2aelba commented Jun 14, 2022

Nziranziza commented Jul 24, 2022 • edited

YaoHuiJi commented Sep 28, 2022 • edited

github-actions bot commented Mar 27, 2023

github-actions bot commented Apr 3, 2023

antoinerousseau commented Oct 15, 2017 •

edited

fishmwei commented Nov 16, 2017 •

edited

thejacobseely commented Nov 16, 2017 •

edited

mattijsf commented Nov 28, 2017 •

edited

grossingdev commented Dec 10, 2017 •

edited

berkcoker commented Jan 17, 2018 •

edited

MikeSilvis commented Apr 13, 2018 •

edited

KrisLau commented Aug 4, 2021 •

edited

mwegener-com commented Nov 3, 2021 •

edited

haibert commented Nov 3, 2021 •

edited

mwegener-com commented Nov 3, 2021 •

edited

haibert commented Nov 3, 2021 •

edited

W-Lawless commented Apr 21, 2022 •

edited

Nziranziza commented Jul 24, 2022 •

edited

YaoHuiJi commented Sep 28, 2022 •

edited