-[AWSIoTStreamThread main] EXC_BAD_ACCESS (KERN_INVALID_ADDRESS)

[ad-Jun]

Describe the bug
This crash occurred frequently online.I utilized the crash stack information monitored by firebase.

Environment(please complete the following information):

• SDK Version: [2.40.2]
• Dependency Manager: [Cocoapods]
• Swift Version : [6.0]
• Xcode Version: [16.2]

Device Information (please complete the following information):

• Device: [iPhone14]
• iOS Version: [iOS 18.4.1]
• Specific to simulators:

INSERT LOG MESSAGES HERE

# Crashlytics - Stack trace
# Application: com.xxxx.xxxx
# Platform: apple
# Version: 2.2.1 (202504282015)
# Issue: 2ebae5c74fcaa6387fb3d7ceac34f535
# Session: 9d19bd80eeb44cf782f6f6311529658c_DNE_0_v2
# Date: Thu May 08 2025 01:30:10 GMT+0800 (中国标准时间)

com.apple.main-thread
0  libsystem_kernel.dylib         0xce4 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x439c mach_msg2_internal + 76
2  libsystem_kernel.dylib         0x42b8 mach_msg_overwrite + 428
3  libsystem_kernel.dylib         0x4100 mach_msg + 24
4  CoreFoundation                 0x716cc __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x70dac __CFRunLoopRun + 1208
6  CoreFoundation                 0x95700 CFRunLoopRunSpecific + 572
7  GraphicsServices               0x1190 GSEventRunModal + 168
8  UIKitCore                      0x3ca240 -[UIApplication _run] + 816
9  UIKitCore                      0x3c8470 UIApplicationMain + 336
10 UIKitCore                      0x826a30 block_destroy_helper.15 + 9820
11 xxxx-RM-iOS                   0xe6e5cc static UIApplicationDelegate.main() + 4382254540 (<compiler-generated>:4382254540)
12 xxxx-RM-iOS                   0xe6c1e0 static AppDelegate.$main() + 4382245344 (<compiler-generated>:4382245344)
13 xxxx-RM-iOS                   0xe6e3c4 main + 40 (AppDelegate.swift:40)
14 ???                            0x1b5397ad8 (缺少)

com.amazon.aws.iot.timer-queue
0  libsystem_kernel.dylib         0xce4 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x439c mach_msg2_internal + 76
2  libsystem_kernel.dylib         0x42b8 mach_msg_overwrite + 428
3  libsystem_kernel.dylib         0x4100 mach_msg + 24
4  CoreFoundation                 0x716cc __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x70dac __CFRunLoopRun + 1208
6  CoreFoundation                 0x95700 CFRunLoopRunSpecific + 572
7  Foundation                     0x748a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8  AWSIoT                         0x63cc4 -[AWSIoTMQTTClient scheduleReconnection] + 1338 (AWSIoTMQTTClient.m:1338)
9  AWSIoT                         0x607ec __43-[AWSIoTMQTTClient initiateReconnectTimer:]_block_invoke + 791 (AWSIoTMQTTClient.m:791)
10 libdispatch.dylib              0x1aac _dispatch_call_block_and_release + 32
11 libdispatch.dylib              0x1b584 _dispatch_client_callout + 16
12 libdispatch.dylib              0xa2d0 _dispatch_lane_serial_drain + 740
13 libdispatch.dylib              0xadac _dispatch_lane_invoke + 388
14 libdispatch.dylib              0x151dc _dispatch_root_queue_drain_deferred_wlh + 292
15 libdispatch.dylib              0x14a60 _dispatch_workloop_worker_thread + 540
16 libsystem_pthread.dylib        0x4660 _pthread_wqthread + 292
17 libsystem_pthread.dylib        0x19f8 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0xa90 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x46ac _pthread_wqthread + 368
2  libsystem_pthread.dylib        0x19f8 start_wqthread + 8

com.apple.uikit.eventfetch-thread
0  libsystem_kernel.dylib         0xce4 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x439c mach_msg2_internal + 76
2  libsystem_kernel.dylib         0x42b8 mach_msg_overwrite + 428
3  libsystem_kernel.dylib         0x4100 mach_msg + 24
4  CoreFoundation                 0x716cc __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x70dac __CFRunLoopRun + 1208
6  CoreFoundation                 0x95700 CFRunLoopRunSpecific + 572
7  Foundation                     0x748a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8  Foundation                     0x736d8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 64
9  UIKitCore                      0x4bd5ec -[UIEventFetcher threadMain] + 424
10 Foundation                     0x115cf8 __NSThread__start__ + 732
11 libsystem_pthread.dylib        0x1afc _pthread_start + 136
12 libsystem_pthread.dylib        0x1a04 thread_start + 8

com.apple.NSURLConnectionLoader
0  libsystem_kernel.dylib         0xce4 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x439c mach_msg2_internal + 76
2  libsystem_kernel.dylib         0x42b8 mach_msg_overwrite + 428
3  libsystem_kernel.dylib         0x4100 mach_msg + 24
4  CoreFoundation                 0x716cc __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x70dac __CFRunLoopRun + 1208
6  CoreFoundation                 0x95700 CFRunLoopRunSpecific + 572
7  CFNetwork                      0xebeec +[__CFN_CoreSchedulingSetRunnable _run:] + 416
8  Foundation                     0x115cf8 __NSThread__start__ + 732
9  libsystem_pthread.dylib        0x1afc _pthread_start + 136
10 libsystem_pthread.dylib        0x1a04 thread_start + 8

com.google.firebase.crashlytics.MachExceptionServer
0  FirebaseCrashlytics            0x1dc08 FIRCLSProcessRecordAllThreads + 392 (FIRCLSProcess.c:392)
1  FirebaseCrashlytics            0x1e014 FIRCLSProcessRecordAllThreads + 423 (FIRCLSProcess.c:423)
2  FirebaseCrashlytics            0x14df8 FIRCLSHandler + 34 (FIRCLSHandler.m:34)
3  FirebaseCrashlytics            0x17994 FIRCLSMachExceptionServer + 521 (FIRCLSMachException.c:521)
4  libsystem_pthread.dylib        0x1afc _pthread_start + 136
5  libsystem_pthread.dylib        0x1a04 thread_start + 8

com.squareup.SocketRocket.NetworkThread
0  libsystem_kernel.dylib         0xce4 mach_msg2_trap + 8
1  libsystem_kernel.dylib         0x439c mach_msg2_internal + 76
2  libsystem_kernel.dylib         0x42b8 mach_msg_overwrite + 428
3  libsystem_kernel.dylib         0x4100 mach_msg + 24
4  CoreFoundation                 0x716cc __CFRunLoopServiceMachPort + 160
5  CoreFoundation                 0x70dac __CFRunLoopRun + 1208
6  CoreFoundation                 0x95700 CFRunLoopRunSpecific + 572
7  Foundation                     0x748a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
8  AWSIoT                         0x8d5a0 -[_SRRunLoopThread main] + 1905 (AWSSRWebSocket.m:1905)
9  Foundation                     0x115cf8 __NSThread__start__ + 732
10 libsystem_pthread.dylib        0x1afc _pthread_start + 136
11 libsystem_pthread.dylib        0x1a04 thread_start + 8

com.apple.CFSocket.private
0  libsystem_kernel.dylib         0x832c select$DARWIN_EXTSN + 8
1  libsystem_kernel.dylib         0x832c __select + 8
2  CoreFoundation                 0xc8b84 __CFSocketManager + 704
3  libsystem_pthread.dylib        0x1afc _pthread_start + 136
4  libsystem_pthread.dylib        0x1a04 thread_start + 8

Crashed: Thread
0  libobjc.A.dylib                0x3020 objc_msgSend + 32
1  CoreFoundation                 0xfdbe4 _outputStreamCallbackFunc + 36
2  CoreFoundation                 0xfdac4 _signalEventSync + 212
3  CoreFoundation                 0xfd97c _cfstream_shared_signalEventSync + 392
4  CoreFoundation                 0x72ce4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
5  CoreFoundation                 0x72c78 __CFRunLoopDoSource0 + 172
6  CoreFoundation                 0x719fc __CFRunLoopDoSources0 + 232
7  CoreFoundation                 0x70c3c __CFRunLoopRun + 840
8  CoreFoundation                 0x95700 CFRunLoopRunSpecific + 572
9  Foundation                     0x748a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
10 AWSIoT                         0x8140c -[AWSIoTStreamThread main] + 98 (AWSIoTStreamThread.m:98)
11 Foundation                     0x115cf8 __NSThread__start__ + 732
12 libsystem_pthread.dylib        0x1afc _pthread_start + 136
13 libsystem_pthread.dylib        0x1a04 thread_start + 8

Thread
0  libsystem_kernel.dylib         0xa90 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x46ac _pthread_wqthread + 368
2  libsystem_pthread.dylib        0x19f8 start_wqthread + 8

Thread
0  libsystem_kernel.dylib         0xa90 __workq_kernreturn + 8
1  libsystem_pthread.dylib        0x46ac _pthread_wqthread + 368
2  libsystem_pthread.dylib        0x19f8 start_wqthread + 8

[thisisabhash]

Hello, thank you for posting this. We have tried to release several improvements in previous releases. However, we have not been successful in reproducing the issue on our side. Would you be able to share a mini project/code that helps us reproduce this issue?

[ad-Jun]

We found that when we actively called the disconnect method of AWSIoTDataManager, the probability of these crashes occurring would increase significantly. Hope this is helpful for you to analyze the occurrence of bugs.
In addition, when I call the AWSIoTDataManager disconnect method, I'll call the reconnection connectUsingWebSocketWithClientId, whether this would be the cause of the crash occurred probability high?

[ad-Jun]

[harsh62]

@ad-Jun Are you able to try the new IoT library we are building https://github.com/aws/aws-iot-device-sdk-swift. The idea is to move away from this SDK to a more stable version.

[ad-Jun]

In fact, how can I be sure that this sdk is a more stable version?

[harsh62]

@ad-Jun The new library is a modern Swift version which would be a replacement for the current one that you are using. The new library is being actively worked upon and if issues arise, team would be able to resolve those issues relatively quickly.