Crash in verifier method when using preconditionIsolated with iOS 17, xcode 15

[sssuourabh]

How frequently does the bug occur?

Always

Description

`actor RealmActor {
var realm: Realm!
init() async throws {
realm = try await Realm(actor: self)
}

func fetchModelObjects<T: Object>(_ type: T.Type) async throws -> [T] {
    guard let realm = realm else {
        debugPrint("Realm is not initialized:")
        return []
    }
    let objects = realm.objects(T.self)
    return objects.map { $0}
}

}`

Stacktrace & log output

RealmSwift/Realm.swift:1469: Precondition failed: Incorrect actor executor assumption; Expected 'UnownedSerialExecutor(executor: (Opaque Value))' executor.

Can you reproduce the bug?

Always

Reproduction Steps

when i call to fetch objects it returns me objects but as soon as i start using that it crashes at

#if swift(>=5.9) // When possible use the official API for actor checking if #available(macOS 14.0, iOS 17.0, tvOS 17.0, watchOS 10.0, *) { return { self.preconditionIsolated() } } #endif

Usage is defined like below:

let realmDB = try! await RealmDBActor() let projectList = try! await realmDB.fetchModelObjects(ProjectObject.self) debugPrint(projectList)

image attached of fetched objects :

Version

10.42.3

What Atlas Services are you using?

Local Database only

Are you using encryption?

No

Platform OS and version(s)

iOS 17

Build environment

Xcode version: XCODE 15
Dependency manager and version: - SPM

[sssuourabh]

@tcollins590 @khambir @buildnewmac

[tgoyne]

You are returning actor-isolated objects out of the actor, which is not a legal thing to do. Enabling sendability checking for your project will give compile-time warnings that calling fetchModelObjects() is unsafe.