ioscrashcoremidiios26

Calling MIDINetworkSession.default() on iOS 26 simulator causes SIGABRT crash

Creating a brand new iOS app in Xcode 26 (beta 17A5241e), and modifying the App file thusly causes a SIGABRT crash when run in the iOS 26 simulator:

import SwiftUI
import CoreMIDI

@main
struct MIDINetworkSession_crashApp: App {
    var body: some Scene {
        WindowGroup {
            let midiNetworkSession = MIDINetworkSession.default()    // <- SIGABRT crash here
            
            ContentView()
        }
    }
}

MIDINetworkSession crash

I realise that as of writing iOS 26 is beta software, and I have submitted this via Apple's Feedback Assistant.

But is a pretty significant crash to encounter in Apple's code. Is anyone else seeing this? And is there some form of workaround to get past this crash?

Update: weirdly, this crash is only happening on the first run of a specific device on the simulator; on the second run the crash does not occur.

Solution

  • This appears to be fixed when building with Xcode 26.0 beta 2 (17A5241o).