As iOS 17 has begun to roll out, our team has noticed a crash increasing in our production application. This crash revolves around UNUserNotificationCenter and calling .getNotificationSettings(completionHandler:) in order to retrieve the users UNNotificationSettings. Upon adding extra logging to our production app, we've determined that in the callback of getNotificationSettings, trying to access the returned value UNNotificationSettings is what's crashing our app. Here's our stacktrace:
Crashed: com.apple.usernotifications.UNUserNotificationServiceConnection.call-out
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000000
0 libswiftCore.dylib 0x3fd3ec swift_getObjectType + 40
1 libswiftCore.dylib 0xd660c _print_unlocked<A, B>(_:_:) + 348
2 OurApp 0x23f8ec closure #1 in closure #1 in MessagingPermissionsModel.authorizationStatus.getter + 155 (MessagingPermissionsModel.swift:155)
3 OurApp 0x8bd98 partial apply for closure #1 in UNUserNotificationCenter.getNotificationSettings(completionHandler:) + 28
4 OurApp 0x8b9bc thunk for @escaping @callee_guaranteed (@guaranteed UNNotificationSettings) -> () + 52 (<compiler-generated>:52)
5 libdispatch.dylib 0x26a8 _dispatch_call_block_and_release + 32
6 libdispatch.dylib 0x4300 _dispatch_client_callout + 20
7 libdispatch.dylib 0xb894 _dispatch_lane_serial_drain + 748
8 libdispatch.dylib 0xc3f8 _dispatch_lane_invoke + 432
9 libdispatch.dylib 0x17004 _dispatch_root_queue_drain_deferred_wlh + 288
10 libdispatch.dylib 0x16878 _dispatch_workloop_worker_thread + 404
Here is also the variable in which this crash is happening (along with our extra logging). We wrap the auth status in a RxSwift single for subscribers.
149 private var authorizationStatus: Single<UNAuthorizationStatus> {
150 Logger.debug("MessagingPermissionsModel.authorizationStatus GET")
151 return Single.create { [weak self] observer -> Disposable in
152 Logger.debug("MessagingPermissionsModel.authorizationStatus Single created")
153 self?.userNotificationCenter.getNotifictionSettings { [weak self] settings in
154 Logger.debug("MessagingPermissionsModel.authorizationStatus Retrieved notification settings")
155 (Crashes here) Logger.debug("MessagingPermissionsModel.authorizationStatus Settings \(settings)")
156 Logger.debug("MessagingPermissionsModel.authorizationStatus Auth Status \(settings.authorizationStatus)")
157 Logger.debug("MessagingPermissionsModel.authorizationStatus Observer \(String(describing: observer))")
158 Logger.debug("MessagingPermissionsModel.authorizationStatus Self \(String(describing: self))")
159 observer(.success(settings.authorizationStatus))
160 Logger.debug("MessagingPermissionsModel.authorizationStatus Observer invoked")
161 }
162 Logger.debug("MessagingPermissionsModel.authorizationStatus Disposable will return")
163 return Disposables.create()
164 }
165 }
From what we've seen so far, I'm lead to believe this is a bug in iOS 17.
