Crash suspend function using Xcode 26 and iOs 15,16 and 17

[pablogeek]

Describe the bug
I am getting a crash compiling the app in xcode 26 and running it in iOS 15,16 and 17. This is fine when compiling the app in Xcode 16.4

To Reproduce
Try to upload a file to S3

Expected behavior
does not crash

Setup (please complete the following information):

• OS: 16
• Version of soto: 7.2
• Authentication mechanism [hard-coded credentials, IAM Instance Profile on EC2, etc]

Additional context

Crashed: com.apple.root.user-initiated-qos.cooperative
0  libsystem_kernel.dylib         0x9fbc __pthread_kill + 8
1  libsystem_pthread.dylib        0x5680 pthread_kill + 268
2  libsystem_c.dylib              0x75b90 abort + 180
3  libswift_Concurrency.dylib     0x46bd8 <redacted> + 30
4  libswift_Concurrency.dylib     0x46bf8 <redacted> + 30
5  libswift_Concurrency.dylib     0x4acfc swift_task_dealloc + 128
6  IRIS Connect                   0x6cdd54 (8) suspend resume partial function for HTTPClient.executeCancellable(_:deadline:logger:) + 119 (HTTPClient+execute.swift:119)
7  libswift_Concurrency.dylib     0x41ac4 <redacted> + 436
8  libswift_Concurrency.dylib     0x42d54 <redacted> + 72
9  libdispatch.dylib              0x15be4 <redacted> + 392
10 libdispatch.dylib              0x163ec <redacted> + 156
11 libsystem_pthread.dylib        0x1928 _pthread_wqthread + 228
12 libsystem_pthread.dylib        0x1a04 start_wqthread + 8

[adam-fowler]

I'm currently away but can you post a small code snippet that causes the crash and the full crash output.

[pablogeek]

Hi,

this is the crashed thread

# Crashlytics - Stack trace
# Application: com.irisconnect.discoverykit
# Platform: apple
# Version: 6.0.72 (257)
# Issue: 604b1738aa3a9287a150c1b6d535e5be
# Session: 2737e35d66674a1fa09423461e95a4f0_DNE_0_v2
# Date: Mon Nov 17 2025 12:00:37 GMT+0100 (Central European Standard Time)

com.apple.main-thread
0  libsystem_kernel.dylib         0x1af8 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x1890 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x17a8 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x15e8 mach_msg + 24
4  CoreFoundation                 0x3601c __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x33f04 __CFRunLoopRun + 1208
6  CoreFoundation                 0x33968 CFRunLoopRunSpecific + 608
7  GraphicsServices               0x34e0 GSEventRunModal + 164
8  UIKitCore                      0x22aedc -[UIApplication _run] + 888
9  UIKitCore                      0x22a518 UIApplicationMain + 340
10 IRIS Connect                   0x4d6c main + 16 (main.m:16)
11 ???                            0x1be2d2d84 (Missing)

Crashed: com.apple.root.user-initiated-qos.cooperative
0  libsystem_kernel.dylib         0xa974 __pthread_kill + 8
1  libsystem_pthread.dylib        0x60ec pthread_kill + 268
2  libsystem_c.dylib              0x75b80 abort + 180
3  libswift_Concurrency.dylib     0x527c8 swift::swift_Concurrency_fatalError(unsigned int, char const*, ...) + 30
4  libswift_Concurrency.dylib     0x527e8 setupStandardConcurrencyDescriptors() + 30
5  libswift_Concurrency.dylib     0x569a8 swift_task_dealloc + 128
6  IRIS Connect                   0x6cdd54 (8) suspend resume partial function for HTTPClient.executeCancellable(_:deadline:logger:) + 119 (HTTPClient+execute.swift:119)
7  libswift_Concurrency.dylib     0x4d764 swift::runJobInEstablishedExecutorContext(swift::Job*) + 436
8  libswift_Concurrency.dylib     0x4e9c8 swift_job_runImpl(swift::Job*, swift::ExecutorRef) + 72
9  libdispatch.dylib              0x15894 _dispatch_root_queue_drain + 392
10 libdispatch.dylib              0x1609c _dispatch_worker_thread2 + 156
11 libsystem_pthread.dylib        0x1ee4 _pthread_wqthread + 228
12 libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0xa084 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x1f6c _pthread_wqthread + 364
2  libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0xa084 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x1f6c _pthread_wqthread + 364
2  libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0xa084 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x1f6c _pthread_wqthread + 364
2  libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

Thread
0  libsystem_pthread.dylib        0x1fb8 start_wqthread + 438

com.apple.uikit.eventfetch-thread
0  libsystem_kernel.dylib         0x1af8 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x1890 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x17a8 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x15e8 mach_msg + 24
4  CoreFoundation                 0x3601c __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x33f04 __CFRunLoopRun + 1208
6  CoreFoundation                 0x33968 CFRunLoopRunSpecific + 608
7  Foundation                     0x2b4a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8  Foundation                     0x554e8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 64
9  UIKitCore                      0x18dac8 -[UIEventFetcher threadMain] + 420
10 Foundation                     0x9ca9c __NSThread__start__ + 732
11 libsystem_pthread.dylib        0x2a90 _pthread_start + 136
12 libsystem_pthread.dylib        0x1fcc thread_start + 8

Thread
0  libsystem_kernel.dylib         0xa084 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x1f6c _pthread_wqthread + 364
2  libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

com.google.firebase.crashlytics.MachExceptionServer
0  libsystem_kernel.dylib         0x1af8 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x1890 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x17a8 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x15e8 mach_msg + 24
4  IRIS Connect                   0xc3544c FIRCLSMachExceptionServer + 196 (FIRCLSMachException.c:196)
5  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
6  libsystem_pthread.dylib        0x1fcc thread_start + 8

Thread
0  libsystem_kernel.dylib         0xa084 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x1f6c _pthread_wqthread + 364
2  libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0xa084 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x1f6c _pthread_wqthread + 364
2  libsystem_pthread.dylib        0x1fc0 start_wqthread + 8

com.apple.NSURLConnectionLoader
0  libsystem_kernel.dylib         0x1af8 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x1890 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x17a8 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x15e8 mach_msg + 24
4  CoreFoundation                 0x3601c __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x33f04 __CFRunLoopRun + 1208
6  CoreFoundation                 0x33968 CFRunLoopRunSpecific + 608
7  CFNetwork                      0x25ac48 estimatedPropertyListSize + 38228
8  Foundation                     0x9ca9c __NSThread__start__ + 732
9  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
10 libsystem_pthread.dylib        0x1fcc thread_start + 8

com.apple.SwiftUI.AsyncRenderer
0  libsystem_kernel.dylib         0x1af8 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x1890 mach_msg2_internal + 80
2  libsystem_kernel.dylib         0x17a8 mach_msg_overwrite + 436
3  libsystem_kernel.dylib         0x15e8 mach_msg + 24
4  CoreFoundation                 0x3601c __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x33f04 __CFRunLoopRun + 1208
6  CoreFoundation                 0x33968 CFRunLoopRunSpecific + 608
7  Foundation                     0x2b4a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8  Foundation                     0x29ff0 -[NSRunLoop(NSRunLoop) run] + 64
9  SwiftUI                        0x6cadfc OUTLINED_FUNCTION_103 + 23748
10 SwiftUI                        0x6caee0 OUTLINED_FUNCTION_103 + 23976
11 Foundation                     0x9ca9c __NSThread__start__ + 732
12 libsystem_pthread.dylib        0x2a90 _pthread_start + 136
13 libsystem_pthread.dylib        0x1fcc thread_start + 8

SGLTN-TP-#0
0  libsystem_kernel.dylib         0x249c __psynch_cvwait + 8
1  libsystem_pthread.dylib        0x1590 _pthread_cond_wait + 1228
2  IRIS Connect                   0x586b8c ConditionLock.lock(whenValue:) + 205 (lock.swift:205)
3  IRIS Connect                   0x637b14 NIOThreadPool.process(identifier:) + 520 (NIOThreadPool.swift:520)
4  IRIS Connect                   0x638084 closure #2 in NIOThreadPool._start(threadNamePrefix:) + 4335911044
5  IRIS Connect                   0x24c0ac partial apply for thunk for @escaping @callee_guaranteed (@guaranteed ScheduleResponse) -> () + 4331798700 (<compiler-generated>:4331798700)
6  IRIS Connect                   0x681008 closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) + 133 (ThreadPosix.swift:133)
7  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
8  libsystem_pthread.dylib        0x1fcc thread_start + 8

SGLTN-TP-#1
0  libsystem_kernel.dylib         0x249c __psynch_cvwait + 8
1  libsystem_pthread.dylib        0x1590 _pthread_cond_wait + 1228
2  IRIS Connect                   0x586b8c ConditionLock.lock(whenValue:) + 205 (lock.swift:205)
3  IRIS Connect                   0x637b14 NIOThreadPool.process(identifier:) + 520 (NIOThreadPool.swift:520)
4  IRIS Connect                   0x638084 closure #2 in NIOThreadPool._start(threadNamePrefix:) + 4335911044
5  IRIS Connect                   0x24c0ac partial apply for thunk for @escaping @callee_guaranteed (@guaranteed ScheduleResponse) -> () + 4331798700 (<compiler-generated>:4331798700)
6  IRIS Connect                   0x681008 closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) + 133 (ThreadPosix.swift:133)
7  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
8  libsystem_pthread.dylib        0x1fcc thread_start + 8

SGLTN-TP-#2
0  libsystem_kernel.dylib         0x249c __psynch_cvwait + 8
1  libsystem_pthread.dylib        0x1590 _pthread_cond_wait + 1228
2  IRIS Connect                   0x586b8c ConditionLock.lock(whenValue:) + 205 (lock.swift:205)
3  IRIS Connect                   0x637b14 NIOThreadPool.process(identifier:) + 520 (NIOThreadPool.swift:520)
4  IRIS Connect                   0x638084 closure #2 in NIOThreadPool._start(threadNamePrefix:) + 4335911044
5  IRIS Connect                   0x24c0ac partial apply for thunk for @escaping @callee_guaranteed (@guaranteed ScheduleResponse) -> () + 4331798700 (<compiler-generated>:4331798700)
6  IRIS Connect                   0x681008 closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) + 133 (ThreadPosix.swift:133)
7  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
8  libsystem_pthread.dylib        0x1fcc thread_start + 8

SGLTN-TP-#3
0  libsystem_kernel.dylib         0x249c __psynch_cvwait + 8
1  libsystem_pthread.dylib        0x1590 _pthread_cond_wait + 1228
2  IRIS Connect                   0x586b8c ConditionLock.lock(whenValue:) + 205 (lock.swift:205)
3  IRIS Connect                   0x637b14 NIOThreadPool.process(identifier:) + 520 (NIOThreadPool.swift:520)
4  IRIS Connect                   0x638084 closure #2 in NIOThreadPool._start(threadNamePrefix:) + 4335911044
5  IRIS Connect                   0x24c0ac partial apply for thunk for @escaping @callee_guaranteed (@guaranteed ScheduleResponse) -> () + 4331798700 (<compiler-generated>:4331798700)
6  IRIS Connect                   0x681008 closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) + 133 (ThreadPosix.swift:133)
7  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
8  libsystem_pthread.dylib        0x1fcc thread_start + 8

SGLTN-TP-#4
0  libsystem_kernel.dylib         0x249c __psynch_cvwait + 8
1  libsystem_pthread.dylib        0x1590 _pthread_cond_wait + 1228
2  IRIS Connect                   0x586b8c ConditionLock.lock(whenValue:) + 205 (lock.swift:205)
3  IRIS Connect                   0x637b14 NIOThreadPool.process(identifier:) + 520 (NIOThreadPool.swift:520)
4  IRIS Connect                   0x638084 closure #2 in NIOThreadPool._start(threadNamePrefix:) + 4335911044
5  IRIS Connect                   0x24c0ac partial apply for thunk for @escaping @callee_guaranteed (@guaranteed ScheduleResponse) -> () + 4331798700 (<compiler-generated>:4331798700)
6  IRIS Connect                   0x681008 closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) + 133 (ThreadPosix.swift:133)
7  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
8  libsystem_pthread.dylib        0x1fcc thread_start + 8

SGLTN-TP-#5
0  libsystem_kernel.dylib         0x249c __psynch_cvwait + 8
1  libsystem_pthread.dylib        0x1590 _pthread_cond_wait + 1228
2  IRIS Connect                   0x586b8c ConditionLock.lock(whenValue:) + 205 (lock.swift:205)
3  IRIS Connect                   0x637b14 NIOThreadPool.process(identifier:) + 520 (NIOThreadPool.swift:520)
4  IRIS Connect                   0x638084 closure #2 in NIOThreadPool._start(threadNamePrefix:) + 4335911044
5  IRIS Connect                   0x24c0ac partial apply for thunk for @escaping @callee_guaranteed (@guaranteed ScheduleResponse) -> () + 4331798700 (<compiler-generated>:4331798700)
6  IRIS Connect                   0x681008 closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) + 133 (ThreadPosix.swift:133)
7  libsystem_pthread.dylib        0x2a90 _pthread_start + 136
8  libsystem_pthread.dylib        0x1fcc thread_start + 8

Code snipet:

func uploadVideo(item: Video) {
        guard let localFileUrl = item.localFilePath else {
            onError?(item, UploaderError.noUrl)
            return
        }
        
        guard let aws = item.aws else {
            onError?(item, UploaderError.noAwsInfo)
            return
        }
        
        let totalSize = item.sizeInBytes
        
        let client: AWSClient
        if let existing = clients[aws.uploadKey] {
            client = existing
        } else {
            cleanupSync()
            client = AWSClient(credentialProvider: .static(accessKeyId: aws.accessKey,
                                                             secretAccessKey: aws.secretKey,
                                                             sessionToken: aws.tokenTemporary))
            clients[aws.uploadKey] = client
        }
        
        let s3 = S3(
            client: client,
            region: Region.regionTypeForString(regionString: aws.endpoint),
            timeout: .minutes(5)
        )
        self.s3 = s3
        
        let request = S3.CreateMultipartUploadRequest(bucket: aws.bucket, key: aws.uploadKey)
        
        Task { [weak self, weak item] in
            guard let self else { return }
            guard let item else { return }
            do {
                let _ = try await s3.multipartUpload(request,
                                                     partSize: bufferSize,
                                                     filename: localFileUrl,
                                                     abortOnFail: false) { [weak item] progress in
                    let uploadedSize = Double(totalSize) * progress
                    DispatchQueue.main.async {
                        item?.updateUploadProgress(Int64(uploadedSize),
                                                   totalBytesExpectedToWrite: totalSize,
                                                   speed: 0.0)
                    }
                    print(progress)
                }
                self.onSucceed(item: item)
            } catch {
                print("UploaderSoto error: \(error.localizedDescription)")
                // remove clients so it creates it again after
                await self.cleanup()
                
                switch error {
                case S3ErrorType.MultipartError.abortedUpload(let resumeReq, _):
                    self.resumeRequest[localFileUrl] = resumeReq
                    if self.reachability.isReachable(), !Task.isCancelled {
                        // Delay before retrying (here, 1 second)
                        do {
                            try await Task.sleep(nanoseconds: 1_000_000_000)
                        } catch {
                            print("Task sleep cancelled: \(error.localizedDescription)")
                        }
                        self.uploadVideo(item: item)
                    }
                default:
                    break
                }
                self.onFailure(item: item, error: error)
            }
        }
        
        item.uploadStatus = .inProgress
    }

[adam-fowler]

Given your Task is unstructured and will continue to run after you exit the function are you certain that the AWSClient isn't deleted before the Task finishes.

Have you considered waiting on the Task to finish inside this function or using a TaskGroup.

[pablogeek]

I changed the implementation and still crashes in ios 15, 16 and 17 when compiling the app in xcode 26.

I've tried using taskgroup as well. It always crashes in the async http lib that soto integrates

[adam-fowler]

Can you try pining earlier versions of async-http-client and see if that fixes the issue. Sorry I can't be more helpful, still away on holiday.

This looks like an issue with the swift runtime from earlier OS'es and latest Xcode. Perhaps @Lukasa has some idea.

[Lukasa]

Oh this is definitely spooky. This looks like a Swift runtime crash. Does updating to a newer Xcode fix the issue? If not, please file a report using feedback assistant, as the crash is coming out of the Swift runtime.

[pablogeek]

I had to revert the app compiling it with Xcode 16, as it was crashing with Xcode 26.1.1 which is the latest stable. Maybe I can try with Xcode 26.2 beta.

File a report with Apple directly right?

[Lukasa]

Yes please, using Feedback Assistant. It is helpful to report the feedback number here as well.