Deadlock when calling App::current_user from an App listener

[kraenhansen]

Expected results

Absence of deadlocks.

Actual Results

Process locks up waiting for m_user_mutex on

realm-core/src/realm/object-store/sync/app.cpp

Line 600 in 72fefa1

util::CheckedLockGuard lock(m_user_mutex);

when the current_user is accessed from an "app listener callback".

Very similar to #7183 (except this was for User).

Steps & Code to Reproduce

The following JS code reproduce the issue:

import Realm from "realm";

const app = Realm.App.get("realmjstestapp-jjhtf");
const credentials = Realm.Credentials.anonymous(false);

setInterval(() => {
    console.log("Still alive");
}, 1000);

app.addListener(() => {
    console.log("Current user is", app.currentUser);
});

await app.logIn(credentials);

Core version

Core version: 8f96615 (most likely caused by #7300)

[sync-by-unito]

➤ PM Bot commented:

Jira ticket: RCORE-2112