With the integration of Apple's pushToTalk framework - we create the PTChannelManager using its async initializer from AppDidFinishLaunching - using an actor to ensure the PTChannelManager is only created once.
With this we have been seeing a lot of crashes for users in our analytics dashboards happening about ~2 seconds after app launch around a task-dealloc.
Here is a simplified version of our actor and Manager - where the manager just shows the init. The init of it is an async optional init because the creation of the PTChannelManager uses an async throws.
actor PushToTalkDeviceContainer {
private var internalPushToTalkManagerTask: Task<PushToTalkManager?, Never>?
func pushToTalkManager() async -> PushToTalkManager? {
#if !os(visionOS)
if let internalPushToTalkManagerTask {
return await internalPushToTalkManagerTask.value
}
let internalPushToTalkManagerTask = Task<PushToTalkManager?, Never> {
return await PushToTalkManagerImp()
}
self.internalPushToTalkManagerTask = internalPushToTalkManagerTask
return await internalPushToTalkManagerTask.value
#else
return nil
#endif
}
}
public class PushToTalkManagerImp: PushToTalkManager {
public let onPushToTalkDelegationEvent: AnyPublisher<PushToTalkDelegationEvent, Never>
public let onPushToTalkAudioSessionChange: AnyPublisher<PushToTalkManagerAudioSessionChange, Never>
public let onChannelRestoration: AnyPublisher<UUID, Never>
private let ptChannelManager: PTChannelManager
private let restorationDelegate: PushToTalkRestorationDelegate
private let delegate: PushToTalkDelegate
init?() async {
self.delegate = PushToTalkDelegate()
self.restorationDelegate = PushToTalkRestorationDelegate()
self.onPushToTalkDelegationEvent = delegate.pushToTalkDelegationSubject.eraseToAnyPublisher()
self.onPushToTalkAudioSessionChange = delegate.audioSessionSubject.eraseToAnyPublisher()
self.onChannelRestoration = restorationDelegate.restorationDelegateSubject.eraseToAnyPublisher()
do {
ptChannelManager = try await PTChannelManager.channelManager(delegate: delegate, restorationDelegate: restorationDelegate)
} catch {
return nil
}
}
}
The crash stack trace is as follows:
0 libsystem_kernel.dylib 0x00000001e903342c __pthread_kill + 8 (:-1)
1 libsystem_pthread.dylib 0x00000001fcdd2c0c pthread_kill + 268 (pthread.c:1721)
2 libsystem_c.dylib 0x00000001a7ed6c34 __abort + 136 (abort.c:159)
3 libsystem_c.dylib 0x00000001a7ed6bac abort + 192 (abort.c:126)
4 libswift_Concurrency.dylib 0x00000001ab2bf7c8 swift::swift_Concurrency_fatalErrorv(unsigned int, char const*, char*) + 32 (Error.cpp:25)
5 libswift_Concurrency.dylib 0x00000001ab2bf7e8 swift::swift_Concurrency_fatalError(unsigned int, char const*, ...) + 32 (Error.cpp:35)
6 libswift_Concurrency.dylib 0x00000001ab2c39a8 swift_task_dealloc + 128 (TaskAlloc.cpp:59)
7 MyApp 0x0000000104908e04 PushToTalkManagerImp.__allocating_init() + 40 (PushToTalkManager.swift:0)
8 MyApp 0x0000000104908e04 closure #1 in PushToTalkDeviceContainer.pushToTalkManager() + 60
9 MyApp 0x00000001041882e9 specialized thunk for @escaping @callee_guaranteed @Sendable @async () -> (@out A) + 1 (<compiler-generated>:0)
10 MyApp 0x0000000103a652bd partial apply for specialized thunk for @escaping @callee_guaranteed @Sendable @async () -> (@out A) + 1 (<compiler-generated>:0)
11 libswift_Concurrency.dylib 0x00000001ab2c2775 completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1 (Task.cpp:463)
juliaCas
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