App login function freezes/hangs when React-Native environment is reloaded (press R twice) on Android

[petergaal]

Goals

Fix freezing login function on App class in React-Native Android application after reloading.

Expected Results

Login function should not freeze.

Actual Results

Login function freezes/hangs forever after logging in into application when the application is reloaded.

Steps to Reproduce

We have a React-Native application running as Android application (in emulator, but similar thing happens on real device). When I reload the application in React-Native environment (pressing R key twice) and I try to log in then the application will freeze forever on login function in App class.

What I already tried:

• realmApp.allUsers[key].loggedIn - false (only one user visible in allUsers)
• realmApp.allUsers[key].logOut() - didn't help
• realmApp.currentUser = returns null
• deleting realm files with adb shell commands - didn't help
• killing the application from memory - after starting the application it works again (just by closing where the application is running in the background and starting it from there doesn't help)
• reinstalling the application (react-native run-android) - works again

Code Sample

const getRealmApp = () => {
  const appConfig = {
    id: Config.REALM_DIR,
    timeout: 30000,
  };
  return new Realm.App(appConfig);
};

export const realmApp = getRealmApp();



export const signIn = async jwt => {
  const creds = Realm.Credentials.jwt(jwt);
  await realmApp?.logIn(creds);  // <- the application will hang on this line
};

Version of Realm and Tooling

• Realm npm package: 10.2.0
• Realm JS SDK Version: ?
• react-native: 0.63.3
• Android: 10
• node: v14.9.0
• Which debugger for React Native: 0.10.7 (not connected)

[kneth]

Thank you for reporting. We have had a similar issue before (#3236), but the fix back then didn't solve all edge cases.

Does it only happen when using Android 10 or do you also observe it with other versions of Android?

[petergaal]

We didn't test it on different version of Android, only version 10. But we can try to test it if it would be useful. Please, let me know.

[kneth]

If it is possible, we will appreciate it.

[petergaal]

Hi. So I made a quick test and on other versions the result is the same. I tested Android versions with API Level 24-28 (Android 7.0 to Android 9.0). I get into a situation sometimes when the application was crashing on API Level 24 and 26 but after repeating the test I always get into a situation of hanging forever.

[luantrasel]

Any update on this? I'm having the same problem on version 10.4.0