Kotlin/native FreezingException cased by ScopeDefinition

Describe the bug Starting koin from iOS app throws an exception

Function doesn't have or inherit @Throws annotation and thus exception isn't propagated from Kotlin to Objective-C/Swift as NSError.
It is considered unexpected and unhandled instead. Program will be terminated.
Uncaught Kotlin exception: kotlin.native.concurrent.FreezingException: freezing of com.example.freezingexceptionsample.shared.GreetModule@17a4188 has failed, first blocker is org.koin.core.scope.ScopeDefinition@cea8c1fa
    at 0   shared                              0x000000010f3960ff kfun:kotlin.Throwable#<init>(kotlin.String?){} + 95 (/Users/teamcity/buildAgent/work/f01984a9f5203417/runtime/src/main/kotlin/kotlin/Throwable.kt:23:37)
    at 1   shared                              0x000000010f39008d kfun:kotlin.Exception#<init>(kotlin.String?){} + 93 (/Users/teamcity/buildAgent/work/f01984a9f5203417/runtime/src/main/kotlin/kotlin/Exceptions.kt:23:44)
    at 2   shared                              0x000000010f39026d kfun:kotlin.RuntimeException#<init>(kotlin.String?){} + 93 (/Users/teamcity/buildAgent/work/f01984a9f5203417/runtime/src/main/kotlin/kotlin/Exceptions.kt:34:44)
    at 3   shared                              0x000000010f3b7755 kfun:kotlin.native.concurrent.FreezingException#<init>(kotlin.Any;kotlin.Any){} + 645 (/Users/teamcity/buildAgent/work/f01984a9f5203417/runtime/src/main/kotlin/kotlin/native/concurrent/Freezing.kt:15:9)
    at 4   shared                              0x000000010f3b79f9 ThrowFreezingException + 233 (/Users/teamcity/buildAgent/work/f01984a9f5203417/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt:87:15)
    at 5   shared                              0x000000010f412810 FreezeSubgraph + 4912
    at 6   shared                              0x000000010f410fa1 InitSharedInstanceStrict + 417
    at 7   shared                              0x000000010f3479f2 kfun:com.example.freezingexceptionsample.shared.initKoin$lambda-1#internal + 450 (/Users/bmukhutdinov/StudioProjects/FreezingExceptionSample/shared/src/commonMain/kotlin/com/example/freezingexceptionsample/shared/Koin.kt:10:9)
    at 8   shared                              0x000000010f347b71 kfun:com.example.freezingexceptionsample.shared.$initKoin$lambda-1$FUNCTION_REFERENCE$2.invoke#internal + 97 (/Users/bmukhutdinov/StudioProjects/FreezingExceptionSample/shared/src/commonMain/kotlin/com/example/freezingexceptionsample/shared/Koin.kt:6:67)
    at 9   shared                              0x000000010f347bf1 kfun:com.example.freezingexceptionsample.shared.$initKoin$lambda-1$FUNCTION_REFERENCE$2.$<bridge-UNNN>invoke(-1:0){}#internal + 97 (/Users/bmukhutdinov/StudioProjects/FreezingExceptionSample/shared/src/commonMain/kotlin/com/example/freezingexceptionsample/shared/Koin.kt:6:67)
    at 10  shared                              0x000000010f431a6c kfun:org.koin.core.context#startKoin(org.koin.core.context.KoinContext;kotlin.Function1<org.koin.core.KoinApplication,kotlin.Unit>){}org.koin.core.KoinApplication + 620 (/Users/a.giuliani/workspace/koin_3.0.0/koin-projects/koin-core/src/commonMain/kotlin/org/koin/core/context/ContextFunctions.kt:39:5)
    at 11  shared                              0x000000010f431d3d kfun:org.koin.core.context#startKoin$default(org.koin.core.context.KoinContext?;kotlin.Function1<org.koin.core.KoinApplication,kotlin.Unit>;kotlin.Int){}org.koin.core.KoinApplication + 365 (/Users/a.giuliani/workspace/koin_3.0.0/koin-projects/koin-core/src/commonMain/kotlin/org/koin/core/context/ContextFunctions.kt:35:1)
    at 12  shared                              0x000000010f3477aa kfun:com.example.freezingexceptionsample.shared#initKoin(kotlin.Function1<org.koin.core.KoinApplication,kotlin.Unit>){}org.koin.core.KoinApplication + 234 (/Users/bmukhutdinov/StudioProjects/FreezingExceptionSample/shared/src/commonMain/kotlin/com/example/freezingexceptionsample/shared/Koin.kt:6:57)
    at 13  shared                              0x000000010f3644b8 objc2kotlin.323 + 216 (/<compiler-generated>:1:0)
    at 14  iosApp                              0x000000010f0c1f83 $s6iosApp0B8DelegateC11application_29didFinishLaunchingWithOptionsSbSo13UIApplicationC_SDySo0j6LaunchI3KeyaypGSgtFTo + 211
    at 15  UIKitCore                           0x00007fff2468d0f1 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 232
    at 16  UIKitCore                           0x00007fff2468ec73 -[UIApplication _callInitializationDelegatesWithActions:forCanvas:payload:fromOriginatingProcess:] + 3919
    at 17  UIKitCore                           0x00007fff24694681 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1237
    at 18  UIKitCore                           0x00007fff23cbd940 -[_UISceneLifecycleMultiplexer completeApplicationLaunchWithFBSScene:transitionContext:] + 179
    at 19  UIKitCore                           0x00007fff24690a6e -[UIApplication _compellApplicationLaunchToCompleteUnconditionally] + 59
    at 20  UIKitCore                           0x00007fff24690dfd -[UIApplication _run] + 898
    at 21  UIKitCore                           0x00007fff24695cbc UIApplicationMain + 101
    at 22  iosApp                              0x000000010f0c265b main + 75 (/Users/bmukhutdinov/StudioProjects/FreezingExceptionSample/iosApp/iosApp/AppDelegate.swift:<unknown>)
    at 23  libdyld.dylib                       0x00007fff202593e9 start + 1
    at 24  ???                                 0x0000000000000001 0x0 + 1
CoreSimulator 732.18.6 - Device: iPhone 12 (8D6421A4-31C3-4873-B376-6390A153FA8A) - Runtime: iOS 14.3 (18C61) - DeviceType: iPhone 12

To Reproduce I created the sample project showing the exception https://github.com/BulatMukhutdinov/FreezingExceptionSample

[saket]

If anyone’s wondering, this happens because objects are frozen by default.

Slightly tangential from this issue, but you should also make sure that koin dependencies are always resolved on the main thread (or the thread on which the graph was created). Accessing dependencies from a different thread will cause the graph to freeze.

[arnaudgiuliani]

Good