Android crash when trying to sign in through Facebook when Firebase is initialised manually

[part22]

Please fill in the following fields:

Unity editor version: 2017.4.32f
Firebase Unity SDK version: 6.4.0
Firebase plugins in use: Auth
Additional SDKs you are using: Facebook v7.17.2
Platform you are using the Unity editor on: Windows
Platform you are targeting: Android

Please describe the issue here:

On device, the app crashes when trying to sign in a user with Facebook auth provider.
The crash only occurs when manually initialising Firebase.

Pre-conditions

• Firebase app configured to accept facebook sign in
• Facebook app configured to let firebase handle OAuth

Steps

1. Launch the app
2. Sign in with Facebook
3. Wait to be logged in
4. Try to sign in with Firebase using Facebook
5. BOOM

In the editor, following these steps works perfectly fine. I can see the user has been added to the users in the firebase app with the right provider.

Logcat output:

09-07 10:49:56.528 5165 5195 E firebase: app != nullptr
09-07 10:49:56.530 5165 5195 E CRASH : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
09-07 10:49:56.530 5165 5195 E CRASH : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

I am not using Firebase.FirebaseApp.DefaultInstance instead I am initialising Firebase myself as follows:

[SerializeField]
private TextAsset _firebaseConfigFile;

private Firebase.Auth.FirebaseAuth CreateAuth()
{
    var firebaseOptions = Firebase.AppOptions.LoadFromJsonConfig(_firebaseConfigFile.text);
    var mainFirebaseApp = Firebase.FirebaseApp.Create(firebaseOptions, "main_app");
    return Firebase.Auth.FirebaseAuth.GetAuth(mainFirebaseApp);
}

_firebaseConfigFile is assigned the json config file downloaded from my Firebase app.

Note
On device, I can signin/signup a user with email and password without a problem.

Please answer the following, if applicable:

Yes, I have been able to reproduce the issue with the test app.

[muflub]

Hi part22,

I think the issue your hitting is that FirebaseApp is getting disposed due to being in a temp variable and thus the auth object is in an invalid state. Try keep the app object alive and see if that fixes your issue.

[part22]

Hi @markchandler-google,

Thanks for your answer.
I have already tried something similar (see code below) for the same reason you have mentioned. Unfortunately, I have had the same problem.

In that scenario the code looked like:

[SerializeField]
private TextAsset _firebaseConfigFile;

private Firebase.FirebaseApp _mainFirebaseApp;
private Firebase.Auth.FirebaseAuth _auth;

private void InitAuth()
{
    var firebaseOptions = Firebase.AppOptions.LoadFromJsonConfig(_firebaseConfigFile.text);
    _mainFirebaseApp = Firebase.FirebaseApp.Create(firebaseOptions, "main_app");
    _auth = Firebase.Auth.FirebaseAuth.GetAuth(mainFirebaseApp);
}

[muflub]

Since you can repo this with the sample app are you able to create a gist of the code and config so I can reproduce the issue?

[muflub]

@part22 does your android device have google play store? This is the only other thing i can think of that causes app to fail initialization and to be null and cause the exception above.

[muflub]

With help from @stewartmiles looks like that for android the default instance of the app must always exist due to logic grabbing the Jni Environment pointer: https://github.com/firebase/firebase-cpp-sdk/blob/master/auth/src/android/credential_android.cc#L315

I will put a bug in for this but for now you can fix the crash by creating the default instance of app and holding onto it in your code.

[a-maurice]

Hi all,

This issue should be resolved in the new version of the Unity SDK, 6.6.0, available at https://firebase.google.com/download/unity

Thanks for bringing this issue to our attention!