IncorrectDereferenceException: Trying to access top level value not marked as @ThreadLocal or @SharedImmutable from non-main thread

[XandrMaster]

Hello guys . I have an exception and crash only for iOs when I config my Real from non-main thread 🙁 . Take a look pls to source code:

@ThreadLocal
object RealmManager {

    val realmDb by lazy { initRealmAsync() }

    private fun initRealmAsync(): Deferred<Realm> {
        return CoroutineScope(Dispatchers.Default).async {
            val config = RealmConfiguration.Builder(
                schema = setOf(
                    UserEntity::class,
                    EquipmentEntity::class,
                    UserActionEntity::class))
                .log(LogLevel.ALL)
                .schemaVersion(1)
                .build()
            Realm.open(config)
        }
    }

    fun forceInit() {
        CoroutineScope(Dispatchers.Default).launch {
            realmDb.await()
        }
    }
}

if I calling forceInit() from iOs it crashes . This code in common module . For Android works fine .
With Dispatchers.Main all good.
Thanks .

[cmelchior]

Hi @XandrMaster Can you provide a bit more information:

• What code do you run to see this error?
• What version of the Realm Kotlin SDK?
• Version of coroutines?
• Version of Kotlin?

Also, any reason you are making the RealmManager ThreadLocal? The Kotlin SDK no longer requires the Realm instance to to locked to a specific thread, so you can just open a single global instance.

[XandrMaster]

Sure :

• just run from Application :

class App : Application() {

    override fun onCreate() {
        super.onCreate()

        RealmManager.forceInit()

        Log.d("App", " DB Init ")
    }
}

 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0-native-mt")
      implementation("io.realm.kotlin:library-base:0.10.0")

• 211-1.6.21-release-334-AS7442.40

[rorbech]

@XandrMaster Could you also please supply the stack trace from the error to indicate which top level value that is causing the issue?

[XandrMaster]

@XandrMaster Could you also please supply the stack trace from the error to indicate which top level value that is causing the issue?

Sure , here you are:

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: Trying to access top level value not marked as @ThreadLocal or @SharedImmutable from non-main thread
    at 0   RealmKmmTest                        0x1071330a8        kfun:kotlin.Throwable#<init>(kotlin.String?){} + 88 
    at 1   RealmKmmTest                        0x10712cfb6        kfun:kotlin.Exception#<init>(kotlin.String?){} + 86 
    at 2   RealmKmmTest                        0x10712d1a6        kfun:kotlin.RuntimeException#<init>(kotlin.String?){} + 86 
    at 3   RealmKmmTest                        0x10713ff66        kfun:kotlin.native.IncorrectDereferenceException#<init>(kotlin.String){} + 86 
    at 4   RealmKmmTest                        0x10715d048        ThrowIncorrectDereferenceException + 120 
    at 5   RealmKmmTest                        0x1072680fd        CheckGlobalsAccessible + 29 
    at 6   RealmKmmTest                        0x10737ecbb        kfun:io.realm.internal.interop#<get-INVALID_CLASS_KEY>(){}io.realm.internal.interop.ClassKey + 123 
    at 7   RealmKmmTest                        0x107373a89        kfun:io.realm.internal.interop.ClassInfo#<init>(kotlin.String;kotlin.String?;kotlin.Long;kotlin.Long;io.realm.internal.interop.ClassKey?;kotlin.Int;kotlin.Int;kotlin.native.internal.DefaultConstructorMarker?){} + 617 
    at 8   RealmKmmTest                        0x107373fb3        kfun:io.realm.internal.interop.ClassInfo.Companion#create(kotlin.String;kotlin.String?;kotlin.Long){}io.realm.internal.interop.ClassInfo + 451 
    at 9   RealmKmmTest                        0x1070cd772        kfun:com.example.kmmrealmtestapp.data.db.UserEntity.Companion#$realm$schema(){}kotlin.Any + 546 
    at 10  RealmKmmTest                        0x10783ac1a        kfun:io.realm.internal.ConfigurationImpl#<init>(kotlin.String?;kotlin.String;kotlin.collections.Set<kotlin.reflect.KClass<out|io.realm.RealmObject>>;io.realm.LogConfiguration;kotlin.Long;kotlinx.coroutines.CoroutineDispatcher;kotlinx.coroutines.CoroutineDispatcher;kotlin.Long;io.realm.internal.interop.SchemaMode;kotlin.ByteArray?;io.realm.CompactOnLaunchCallback?;io.realm.migration.RealmMigration?){} + 4218 
    at 11  RealmKmmTest                        0x107842ea6        kfun:io.realm.internal.RealmConfigurationImpl#<init>(kotlin.String?;kotlin.String;kotlin.collections.Set<kotlin.reflect.KClass<out|io.realm.RealmObject>>;io.realm.LogConfiguration;kotlin.Long;kotlinx.coroutines.CoroutineDispatcher;kotlinx.coroutines.CoroutineDispatcher;kotlin.Long;kotlin.ByteArray?;kotlin.Boolean;io.realm.CompactOnLaunchCallback?;io.realm.migration.RealmMigration?){} + 902 
    at 12  RealmKmmTest                        0x107835cf6        kfun:io.realm.RealmConfiguration.Builder#build(){}io.realm.RealmConfiguration + 1478 
    at 13  RealmKmmTest                        0x1070cb889        kfun:com.example.kmmrealmtestapp.data.db.RealmManager.$initRealmAsync$lambda-1COROUTINE$0.invokeSuspend#internal + 761 
    at 14  RealmKmmTest                        0x107136bdd        kfun:kotlin.coroutines.native.internal.BaseContinuationImpl#resumeWith(kotlin.Result<kotlin.Any?>){} + 685 
    at 15  RealmKmmTest                        0x10733105e        kfun:kotlinx.coroutines.DispatchedTask#run(){} + 3182 
    at 16  RealmKmmTest                        0x1072ba74a        kfun:kotlinx.coroutines.EventLoopImplBase#processNextEvent(){}kotlin.Long + 826 
    at 17  RealmKmmTest                        0x10735a5a7        kfun:kotlinx.coroutines#runEventLoop(kotlinx.coroutines.EventLoop?;kotlin.Function0<kotlin.Boolean>){} + 887 
    at 18  RealmKmmTest                        0x107362231        kfun:kotlinx.coroutines.WorkerCoroutineDispatcherImpl.start$lambda-0#internal + 385 
    at 19  RealmKmmTest                        0x10736236c        kfun:kotlinx.coroutines.WorkerCoroutineDispatcherImpl.$start$lambda-0$FUNCTION_REFERENCE$73.invoke#internal + 60 
    at 20  RealmKmmTest                        0x10736244c        kfun:kotlinx.coroutines.WorkerCoroutineDispatcherImpl.$start$lambda-0$FUNCTION_REFERENCE$73.$<bridge-UNN>invoke(){}#internal + 60 
    at 21  RealmKmmTest                        0x107142d1a        WorkerLaunchpad + 186 
    at 22  RealmKmmTest                        0x1072839a6        _ZN6Worker19processQueueElementEb + 2278 
    at 23  RealmKmmTest                        0x10728307a        _ZN12_GLOBAL__N_113workerRoutineEPv + 74 
    at 24  libsystem_pthread.dylib             0x7fff6da32513     _pthread_start + 124 
    at 25  libsystem_pthread.dylib             0x7fff6da2e02e     thread_start + 14 

Process finished with exit code 0