Xcode 14.0 beta 4 reports "Hang Risk" in RCTWebSocket

[lujstn]

Description

Error reported: Thread running at QOS_CLASS_USER_INTERACTIVE waiting on a lower QoS thread running at QOS_CLASS_DEFAULT. Investigate ways to avoid priority inversions.
Using Xcode Version 14.0 beta 4 (14A5284g).

Seemingly originates from RCTSRWebSocket.m

Version

0.66.3

Output of npx react-native info

info Fetching system and libraries information...
System:
OS: macOS 12.5
CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
Memory: 186.13 MB / 16.00 GB
Shell: 5.8 - /usr/local/bin/zsh
Binaries:
Node: 14.17.1 - ~/.nvm/versions/node/v14.17.1/bin/node
Yarn: 1.22.10 - ~/src/github.com/umbermoney/daisy/node_modules/.bin/yarn
npm: 6.14.13 - ~/.nvm/versions/node/v14.17.1/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.10.1 - /Users/lucas/.rbenv/shims/pod
SDKs:
iOS SDK:
Platforms: DriverKit 21.4, iOS 15.4, macOS 12.3, tvOS 15.4, watchOS 8.5
Android SDK:
API Levels: 21, 28, 29, 30
Build Tools: 28.0.3, 29.0.2, 29.0.3, 30.0.2
System Images: android-29 | Google APIs Intel x86 Atom, android-31 | Google APIs Intel x86 Atom_64
Android NDK: Not Found
IDEs:
Android Studio: 2021.2 AI-212.5712.43.2112.8609683
Xcode: 13.3/13E113 - /usr/bin/xcodebuild
Languages:
Java: 1.8.0_251 - /Users/lucas/.jenv/shims/javac
npmPackages:
@react-native-community/cli: Not Found
react: 17.0.2 => 17.0.2
react-native: 0.66.3 => 0.66.3
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

Steps to reproduce

1. Create react-native project on Xcode Version 14.0 beta 4 (14A5284g)
2. Run application

Snack, code example, screenshot, or link to a repository

react-native/Libraries/WebSocket/RCTSRWebSocket.m

Line 1636 in 6fcfe2e

dispatch_group_wait(_waitGroup, DISPATCH_TIME_FOREVER);

[titanium-cranium]

Any movement on this? Our app is similarly hamstrung after upgrade to iOS16

[Quadrified]

Facing the same issue on iOS 15.x and iOS 16 on Xcode 14.0.1
Any alternate fix to at least patch this issue until we wait for a permanent fix?

[xuannam12]

Try clone the new repo for your project!

[muhabutt]

Facing the same issue on iOS 15.x and iOS 16 on Xcode 14.0.1. I think there is something wrong with the generated FBReactNativeSpec code.

[hamzasohail]

This falls under the same category as discussed here: realm/realm-core#5697

The difference is that this inversion is triggered by a dispatch group but it's the same problem -- the threads in the dispatch group are not running at a QoS higher than "Default". For folks who work on Websocket, there are resolution strategies mentioned in realm/realm-core#5697.

[costea93]

any updates on this?

[muhabutt]

Any updates on this issue, I can reproduce this bug on Fresh react native 0.70.2.

[bodrius]

the same error

[xiongxiongjiang]

same error

[xiongxiongjiang]

node_modules/react-native/Libraries/WebSocket/RCTSRWebSocket.m:1632: warning run: Thread running at QOS_CLASS_USER_INTERACTIVE waiting on a lower QoS thread running at QOS_CLASS_DEFAULT. Investigate ways to avoid priority inversions
at:

- (NSRunLoop *)runLoop
{
  dispatch_group_wait(_waitGroup, DISPATCH_TIME_FOREVER);
  return _runLoop;
}

[alessioemireni]

+1

[george-bafaloukas-forgerock]

+1 This seems present on a Fresh RN upgrade