Code compiles, however doesn't work as expected, I was asked to issue this.

[berke-yilmaz]

SDK and version

SDK : ? (Cocoa, Java, etc)
Swift
Version: ?
Last Version

Observations

• How frequent do the crash occur? every time
• Does it happen in production or during dev/test? production
• Can the crash be reproduced by you? yes
• Can you provide instructions for how we can reproduce it? by compiling

Crash log / stacktrace

/Users/mac/Library/Developer/Xcode/DerivedData/chessbrk-fbjogatoybvdkibovkkgafrsticz/SourcePackages/checkouts/realm-core/src/realm/sync/noinst/client_impl_base.hpp:1340: [realm-core-14.12.1] Assertion failed: m_error_message_received || !m_unbind_message_sent
0 RealmSwift 0x000000010c8fbed4 _ZN5realm4utilL18terminate_internalERNSt3__118basic_stringstreamIcNS1_11char_traitsIcEENS1_9allocatorIcEEEE + 56
1 RealmSwift 0x000000010c8fbe98 _ZN5realm4util19terminate_with_infoEPKcS2_lS2_OSt16initializer_listINS0_9PrintableEE + 352
2 RealmSwift 0x000000010c8fbd38 _ZN5realm4util19terminate_with_infoEPKcS2_lS2_OSt16initializer_listINS0_9PrintableEE + 0
3 RealmSwift 0x000000010c61efb8 _ZN5realm4sync10ClientImpl7Session40request_download_completion_notificationEv + 316
4 RealmSwift 0x000000010c61ee28 _ZZN5realm4sync14SessionWrapper14async_wait_forEbbNS_4util14UniqueFunctionIFvNS_6StatusEEEEEN4$10clES4 + 684
5 RealmSwift 0x000000010c61eaa8 _ZN5realm4util14UniqueFunctionIFvNS_6StatusEEE12SpecificImplIZNS_4sync14SessionWrapper14async_wait_forEbbS4_E4$10E4callEOS2 + 96
6 RealmSwift 0x000000010c3c487c ZNK5realm4util14UniqueFunctionIFvNS_6StatusEEEclES2 + 156
7 RealmSwift 0x000000010c724c68 _ZZN5realm4sync10ClientImpl4postEONS_4util14UniqueFunctionIFvNS_6StatusEEEEENK3$1clES4 + 96
8 RealmSwift 0x000000010c724b48 _ZN5realm4util14UniqueFunctionIFvNS_6StatusEEE12SpecificImplIZNS_4sync10ClientImpl4postEOS4_E3$1E4callEOS2 + 96
9 RealmSwift 0x000000010c3c487c ZNK5realm4util14UniqueFunctionIFvNS_6StatusEEEclES2 + 156
10 RealmSwift 0x000000010c65dc78 _ZN5realm4sync7network7Service8PostOperINS_4util14UniqueFunctionIFvNS_6StatusEEEEE19recycle_and_executeEv + 88
11 RealmSwift 0x000000010c69154c _ZN5realm4sync7network7Service4Impl7executeERNSt3__110unique_ptrINS2_9AsyncOperENS2_18LendersOperDeleterEEE + 52
12 RealmSwift 0x000000010c6910e0 _ZN5realm4sync7network7Service4Impl8run_implEb + 484
13 RealmSwift 0x000000010c68bc38 _ZN5realm4sync7network7Service4Impl17run_until_stoppedEv + 48
14 RealmSwift 0x000000010c68bbfc _ZN5realm4sync7network7Service17run_until_stoppedEv + 44
15 RealmSwift 0x000000010c65d158 _ZN5realm4sync9websocket21DefaultSocketProvider10event_loopEv + 464
16 RealmSwift 0x000000010c66285c ZNSt3__18__invokeB8ue170006IMN5realm4sync9websocket21DefaultSocketProviderEFvvEPS4_JEvEEDTcldsdeclsr3stdE7declvalIT0_EEclsr3stdE7declvalIT_EEspclsr3stdE7declvalIT1_EEEEOS9_OS8_DpOSA + 132
17 RealmSwift 0x000000010c6627cc _ZNSt3__116__thread_executeB8ue170006INS_10unique_ptrINS_15__thread_structENS_14default_deleteIS2_EEEEMN5realm4sync9websocket21DefaultSocketProviderEFvvEJPS9_EJLm2EEEEvRNS_5tupleIJT_T0_DpT1_EEENS_15__tuple_indicesIJXspT2_EEEE + 64
18 RealmSwift 0x000000010c6623b8 ZNSt3__114__thread_proxyB8ue170006INS_5tupleIJNS_10unique_ptrINS_15__thread_structENS_14default_deleteIS3_EEEEMN5realm4sync9websocket21DefaultSocketProviderEFvvEPSA_EEEEEPvSF + 100
19 libsystem_pthread.dylib 0x00000001045d3414 _pthread_start + 104
20 libsystem_pthread.dylib 0x00000001045ce5e0 thread_start + 8
!!! IMPORTANT: Please report this at https://github.com/realm/realm-core/issues/new/choose

Steps & Code to Reproduce

func configureFlexibleSync() async throws -> Realm {
print("Starting configureFlexibleSync function...")

// Ensure the current user exists
guard let user = app.currentUser else {
    print("No logged-in user found.")
    throw NSError(domain: "Login Error", code: 401, userInfo: [NSLocalizedDescriptionKey: "No logged-in user found."])
}

print("Current user: \(user)")

let config = user.flexibleSyncConfiguration()
print("Flexible sync configuration created.")

// Open Realm asynchronously
let realm = try await Realm(configuration: config)
print("Realm opened successfully.")

// Safely unwrap the email property outside of the subscription update block
guard let userEmail = user.profile.email else {
    print("User profile email not found.")
    throw NSError(domain: "Profile Error", code: 402, userInfo: [NSLocalizedDescriptionKey: "User profile email not found."])
}
print("User email: \(userEmail)")

// Update subscriptions without removal to avoid potential issues
try await realm.subscriptions.update {
    print("Updating subscriptions...")

    // Check if a subscription for UserProfile already exists
    if let existingSubscription = realm.subscriptions.first(named: "UserProfile") {
        print("Existing subscription for UserProfile found.")
    } else {
        print("No existing subscription found for UserProfile. Adding new subscription for user: \(userEmail)")
        // Add a new subscription for the UserProfile filtered by email
        realm.subscriptions.append(QuerySubscription<UserProfile>(name: "UserProfile") {
            $0.email == userEmail
        })
    }
}

print("Subscriptions updated successfully.")

// Return the Realm instance after the subscriptions are updated
return realm

}

[sync-by-unito]

➤ PM Bot commented:

Jira ticket: RCORE-2258

[jedelbo]

@tgoyne any immediate comment?