Crash in AppSyncRealTimeClient.unsubscribe(id:)

[amruth-movano]

Describe the bug

Prod users are facing crash in -

          Crashed: com.apple.root.user-initiated-qos.cooperative
0  Evie Ring                      0x1451db4 AppSyncRealTimeClient.unsubscribe(id:) + 208 (AppSyncRealTimeClient.swift:208)
1  libswift_Concurrency.dylib     0x4d764 swift::runJobInEstablishedExecutorContext(swift::Job*) + 436
2  libswift_Concurrency.dylib     0x4e9c8 swift_job_runImpl(swift::Job*, swift::ExecutorRef) + 72
3  libdispatch.dylib              0x15894 _dispatch_root_queue_drain + 392
4  libdispatch.dylib              0x1609c _dispatch_worker_thread2 + 156
5  libsystem_pthread.dylib        0x48f8 _pthread_wqthread + 228
6  libsystem_pthread.dylib        0x10cc start_wqthread + 8

Steps To Reproduce

Expected behavior

App should not crash

Amplify Framework Version

2.33.6

Amplify Categories

API, Auth

Dependency manager

Swift PM

Swift version

5.9.2

CLI version

12.11.1

Xcode version

15.0

Relevant log output

-

Is this a regression?

Yes

Regression additional context

No response

Platforms

iOS

OS Version

iOS 17.5.1

Device

iPhone 13 Pro

Specific to simulators

No response

Additional context

No response

[amruth-movano]

@5d @lawmicha Can you please check this on priority

[harsh62]

Similar to what I mentioned in #3834 , would you be able to share more details around how we will be able to reproduce this crash in a local environment with symbolicated logs and verbose logs.

[amruth-movano]

@harsh62 We are unable to reproduce this scenario using Xcode and the only stack trace which we have is I have already added

[lawmicha]

Hi @amruth-movano, can you try with the latest to reproduce and provide us with a full stack trace? see @5d's comment over here https://github.com/aws-amplify/amplify-swift/issues/3834/#issuecomment-2318322611

[5d]

Hi @amruth-movano,

I've tried to subscribe/unsubscribe with 90 subscriptions several times to reproduce the issue. Unfortunately, I couldn't reproduce the issue.

var subscriptions = AtomicDictionary<String, Cancellable>()
Task {
    for _ in 1...30 {
        Task.detached {
            subscriptions.set(
                value: Amplify.API.subscribe(request: .subscription(to: Todo.self, subscriptionType: .onCreate)),
                forKey: UUID().uuidString
            )
        }

        Task.detached {
            subscriptions.set(
                value: Amplify.API.subscribe(request: .subscription(to: Todo.self, subscriptionType: .onUpdate)),
                forKey: UUID().uuidString
            )
        }

        Task.detached {
            subscriptions.set(
                value: Amplify.API.subscribe(request: .subscription(to: Todo.self, subscriptionType: .onDelete)),
                forKey: UUID().uuidString
            )
        }

    }
}

Would it be convenient for you to provide the complete crash symbol log from your side? Or if you have some confidential info inside the log, you can reach out to us with AWS support ticket.

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