iOS 14 CoreFoundation crash with EXC_BREAKPOINT

Question

Created Oct ’20

Replies 29

Boosts 1

Views 13k

Participants 11

Hi,
I am facing a strange issue in my app with iOS14 there is a intermittent crash, i am using NetServiceBrowser for MDNS discovery not sure if that is causing the problem crash log has below information:

Crashed: com.apple.main-thread
0 CoreFoundation 0x1a906c4c4 CFAssertMismatchedTypeID + 108
1 CoreFoundation 0x1a8f7db0c CFRunLoopSourceRemoveFromRunLoop + 298
2 CFNetwork 0x1a96255b0 CFNetServiceBrowserStopSearch + 460
3 CoreFoundation 0x1a8f81240 CFRUNLOOPISCALLINGOUTTOASOURCE0PERFORMFUNCTION + 24
4 CoreFoundation 0x1a8f81140 CFRunLoopDoSource0 + 204
5 CoreFoundation 0x1a8f80488 CFRunLoopDoSources0 + 256
6 CoreFoundation 0x1a8f7aa40 CFRunLoopRun + 776
7 CoreFoundation 0x1a8f7a200 CFRunLoopRunSpecific + 572
8 GraphicsServices 0x1bf075598 GSEventRunModal + 160
9 UIKitCore 0x1ab840004 -[UIApplication run] + 1052
10 UIKitCore 0x1ab8455d8 UIApplicationMain + 164

Answered by DTS Engineer in 787317022

Yes. using Multipeer Connectivity

OK. In that case my answer is that you should stop using Multipeer Connectivity. This is a long-standing bug and, while I can’t predict the future with 100% accuracy, I think it’s reasonable to infer future behaviour from past behaviour. In this case, you’re looking at a crashing bug that’s been around for at least 3 years old [1]. How long are you prepared to wait for a fix?

IMO Multipeer Connectivity should be officially deprecated in favour of Network framework [2]. If you’d like to make that transition:

Check out the Building a custom peer-to-peer protocol sample code.
If you get, stuck a new thread with the details. Tag it with Network so that I see it.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

[1] Based on the age of this thread. I suspect that this bug has been around for much longer than that.

[2] And, to be clear, this is a personal opinion. I don’t set official Apple policy for this stuff. The official policy is in TN3151 Choosing the right networking API, which has to walk a fine line because Multipeer Connectivity isn’t officially deprecated.

Boost

Answer 1

DTS Engineer OP

Apple

Nov ’20

We've been seeing a number of crashes with a similar assertion, but
related to the EAAccessory Framework.

These errors are unlikely to be related. You’re crashing for the same reason (CF has detected a type mismatch at runtime) but the cause of that type mismatch is very different.

Consider this snippet from the crashing thread’s backtrace:

Code Block  1   CoreFoundation    … _CFAssertMismatchedTypeID + 100
2   CoreFoundation    … CFRunLoopSourceSignal + 312
3   ExternalAccessory … -[EAInputStream _scheduleCallback] + 72
4   ExternalAccessory … -[EAInputStream _performAtEndOfStreamValidation] + 116

Frame 1 is the type mismatch, but note how frames 2 is different (in the other cases it was removing a run loop source) as are frames 3 and 4.

I recommend that you open a new thread for this and tag it with ExternalAccessory to see if anyone with EA experience (which I do not have, btw) chimes in.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"

0

Answer 2

hyde OP

Mar ’21

Hello there,

Has anyone figured out the cause of this crash?
We are facing the same issue since iOS 14 (14.3 and 14.4) when using multipeer connectivity and MCNearbyServiceBrowser.

Thanks!

0

Answer 3

litso OP

Apr ’21

Our app uses Multipeer Connectivity and we've been experiencing this issue since iOS 14 was released.

One common theme is that the app is running in the background when the issue arrises and we get the crash.

Expected typeID 46 (CFRunLoopSource) does not match actual typeID 61 (CFSocket)

We've been trying to diagnose what is happening through our remote logging, but so far the cause of the issue has escaped us.

0

Answer 4

DTS Engineer OP

Apple

May ’21

One common theme is that the app is running in the background when the
issue arrises and we get the crash.

You use Multipeer Connectivity in the background? Is that just because you don’t shut it down when you move to the background? Or because you actually need to use it in the background?

Multipeer Connectivity isn’t rated for use the background. Some parts of it will likely work as long as you guarantee that your process never gets suspended (as is generally true for out networking APIs). Other parts simply don’t make sense in the background.

Having said that, it shouldn’t crash )-:

Do you have an Apple crash report for this? If so, please post it here. Use the text attachment feature (the paperclip icon) to avoid clogging up the timeline.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 5

hyde OP

May ’21

Hi,

Would this Apple crash report help?

Thanks,

Crash Report

Incident Identifier: 9DF4776D-CC6B-4932-86C3-9161F742D8D9
Hardware Model:      iPad7,5
Process:             Zelty Borne [6861]
Path:                /private/var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Zelty Borne
Identifier:          fr.zelty.borne
Version:             107 (1.2)
AppStoreTools:       12D4d
AppVariant:          1:iPad7,5:14
Beta:                YES
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           fr.zelty.borne [356]


Date/Time:           2021-05-17 16:02:35.6188 +0200
Launch Time:         2021-05-17 16:01:58.0711 +0200
OS Version:          iPhone OS 14.4.2 (18D70)
Release Type:        User
Baseband Version:    n/a
Report Version:      104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000187823108
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [6861]
Triggered by Thread:  0

Thread 0 name:
Thread 0 Crashed:
0   CoreFoundation                	0x0000000187823108 _CFAssertMismatchedTypeID + 108 (CFRuntime.c:934)
1   CoreFoundation                	0x0000000187823100 _CFAssertMismatchedTypeID + 100 (CFRuntime.c:933)
2   CoreFoundation                	0x00000001877344ac CFRunLoopSourceInvalidate + 300 (CFRuntime_Internal.h:118)
3   CFNetwork                     	0x0000000187de279c _BrowserCancel(__CFNetServiceBrowser*) + 76 (CFNetServiceBrowser.c:178)
4   CoreFoundation                	0x0000000187737bf0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 (CFRunLoop.c:1967)
5   CoreFoundation                	0x0000000187737af0 __CFRunLoopDoSource0 + 204 (CFRunLoop.c:2011)
6   CoreFoundation                	0x0000000187736e38 __CFRunLoopDoSources0 + 256 (CFRunLoop.c:2048)
7   CoreFoundation                	0x00000001877313e0 __CFRunLoopRun + 776 (CFRunLoop.c:2925)
8   CoreFoundation                	0x0000000187730ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
9   GraphicsServices              	0x000000019e496598 GSEventRunModal + 160 (GSEvent.c:2259)
10  UIKitCore                     	0x000000018a0222f4 -[UIApplication _run] + 1052 (UIApplication.m:3253)
11  UIKitCore                     	0x000000018a027874 UIApplicationMain + 164 (UIApplication.m:4707)
12  Zelty Borne                   	0x0000000104f2dc64 0x104f00000 + 187492
13  libdyld.dylib                 	0x000000018740f568 start + 4

Thread 1:
0   libsystem_pthread.dylib       	0x00000001cf32886c start_wqthread + 0

Thread 2 name:
Thread 2:
0   libsystem_kernel.dylib        	0x00000001b2f28644 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001b2f27a48 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                	0x00000001877370fc __CFRunLoopServiceMachPort + 376 (CFRunLoop.c:2641)
3   CoreFoundation                	0x0000000187731570 __CFRunLoopRun + 1176 (CFRunLoop.c:2974)
4   CoreFoundation                	0x0000000187730ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
5   Foundation                    	0x00000001889507f8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228 (NSRunLoop.m:374)
6   Foundation                    	0x00000001889506d8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 88 (NSRunLoop.m:421)
7   UIKitCore                     	0x000000018a0ce054 -[UIEventFetcher threadMain] + 504 (UIEventFetcher.m:838)
8   Foundation                    	0x0000000188aad4bc __NSThread__start__ + 848 (NSThread.m:724)
9   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
10  libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 3 name:
Thread 3:
0   libsystem_kernel.dylib        	0x00000001b2f4e5fc write + 8
1   FirebaseCrashlytics           	0x000000010551a224 FIRCLSSDKFileLog + 316 (FIRCLSInternalLogging.c:0)
2   FirebaseCrashlytics           	0x000000010551bda8 FIRCLSMachExceptionReply + 128 (FIRCLSMachException.c:267)
3   FirebaseCrashlytics           	0x000000010551bda8 FIRCLSMachExceptionServer + 996 (FIRCLSMachException.c:178)
4   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
5   libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 4 name:
Thread 4:
0   libsystem_kernel.dylib        	0x00000001b2f28644 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001b2f27a48 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                	0x00000001877370fc __CFRunLoopServiceMachPort + 376 (CFRunLoop.c:2641)
3   CoreFoundation                	0x0000000187731570 __CFRunLoopRun + 1176 (CFRunLoop.c:2974)
4   CoreFoundation                	0x0000000187730ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
5   Foundation                    	0x00000001889507f8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228 (NSRunLoop.m:374)
6   Zelty Borne                   	0x00000001050a94e0 -[ZPrinterManager startPrintersCommunicationRunLoop] + 196 (ZPrinterManager.m:593)
7   Foundation                    	0x0000000188aad4bc __NSThread__start__ + 848 (NSThread.m:724)
8   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
9   libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 5 name:
Thread 5:
0   libsystem_kernel.dylib        	0x00000001b2f28644 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001b2f27a48 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                	0x00000001877370fc __CFRunLoopServiceMachPort + 376 (CFRunLoop.c:2641)
3   CoreFoundation                	0x0000000187731570 __CFRunLoopRun + 1176 (CFRunLoop.c:2974)
4   CoreFoundation                	0x0000000187730ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
5   Foundation                    	0x00000001889507f8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228 (NSRunLoop.m:374)
6   Zelty Borne                   	0x00000001050a7ac8 -[ZPrinterManager startDiscoveryRunLoop] + 232 (ZPrinterManager.m:263)
7   Foundation                    	0x0000000188aad4bc __NSThread__start__ + 848 (NSThread.m:724)
8   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
9   libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 6 name:
Thread 6:
0   libsystem_kernel.dylib        	0x00000001b2f28644 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001b2f27a48 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                	0x00000001877370fc __CFRunLoopServiceMachPort + 376 (CFRunLoop.c:2641)
3   CoreFoundation                	0x0000000187731570 __CFRunLoopRun + 1176 (CFRunLoop.c:2974)
4   CoreFoundation                	0x0000000187730ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
5   CFNetwork                     	0x0000000187fc24b0 +[__CFN_CoreSchedulingSetRunnable _run:] + 552 (CoreSchedulingSet.mm:1374)
6   Foundation                    	0x0000000188aad4bc __NSThread__start__ + 848 (NSThread.m:724)
7   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
8   libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 7 name:
Thread 7:
0   libsystem_kernel.dylib        	0x00000001b2f4bb00 select$DARWIN_EXTSN + 8
1   CoreFoundation                	0x0000000187743400 __CFSocketManager + 616 (CFSocket.c:1343)
2   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
3   libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 8 name:
Thread 8:
0   libsystem_kernel.dylib        	0x00000001b2f28644 mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x00000001b2f27a48 mach_msg + 72 (mach_msg.c:103)
2   CoreFoundation                	0x00000001877370fc __CFRunLoopServiceMachPort + 376 (CFRunLoop.c:2641)
3   CoreFoundation                	0x0000000187731570 __CFRunLoopRun + 1176 (CFRunLoop.c:2974)
4   CoreFoundation                	0x0000000187730ba0 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
5   CoreFoundation                	0x0000000187753174 _legacyStreamRunLoop_workThread + 260 (CFStream.c:1773)
6   libsystem_pthread.dylib       	0x00000001cf323c9c _pthread_start + 288 (pthread.c:881)
7   libsystem_pthread.dylib       	0x00000001cf328880 thread_start + 8

Thread 9:
0   libsystem_pthread.dylib       	0x00000001cf32886c start_wqthread + 0

Thread 10:
0   libsystem_pthread.dylib       	0x00000001cf32886c start_wqthread + 0

Thread 11:
0   libsystem_pthread.dylib       	0x00000001cf32886c start_wqthread + 0

Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x000000000000004f   x1: 0x0000000187a05a3f   x2: 0x0000000000000000   x3: 0x000000016aefe900
    x4: 0x000000016aefd608   x5: 0x000000016aefe890   x6: 0x0000000000000029   x7: 0x0000000000000403
    x8: 0x00000001df382000   x9: 0x8506efeda021003f  x10: 0x0000000000000001  x11: 0x0000000000000001
   x12: 0x0000000187a0671b  x13: 0x0000010000000000  x14: 0x0000000000000010  x15: 0x0000120000000000
   x16: 0x0000000196b6a138  x17: 0x0000120000001200  x18: 0x0000000000000000  x19: 0x000000016aefe8b1
   x20: 0x000000000000002e  x21: 0x00000001879fcce2  x22: 0x0000000187a0501a  x23: 0x00000001ded61000
   x24: 0x00000001ded61000  x25: 0x0000000000000000  x26: 0x0000000282b94008  x27: 0x00000001ded61000
   x28: 0x00000001ded61000   fp: 0x000000016aefe9e0   lr: 0x0000000187823100
    sp: 0x000000016aefe890   pc: 0x0000000187823108 cpsr: 0x60000000
   esr: 0xf2000001  Address size fault

Binary Images:
0x104f00000 - 0x10519bfff Zelty Borne arm64  <bc269892f75c3b2baa63315cdfa42125> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Zelty Borne
0x1054ac000 - 0x1054bbfff FBLPromises arm64  <f3ec4fe4a4743936addabc80423a29d0> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/FBLPromises.framework/FBLPromises
0x1054c8000 - 0x1054d7fff FirebaseCore arm64  <4d5f31dedf8b3c31a0f63f1d17f0f4d2> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/FirebaseCore.framework/FirebaseCore
0x1054f0000 - 0x1054f7fff FirebaseCoreDiagnostics arm64  <e2b6db8a41283d79a5fa881e13a38e01> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/FirebaseCoreDiagnostics.framework/FirebaseCoreDiagnostics
0x105504000 - 0x10553ffff FirebaseCrashlytics arm64  <da696dde58b637c69ee5c2433d0c9aeb> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/FirebaseCrashlytics.framework/FirebaseCrashlytics
0x105564000 - 0x10557bfff FirebaseInstallations arm64  <3a5b9452312c3bba8dfd7172d4b79a51> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/FirebaseInstallations.framework/FirebaseInstallations
0x105594000 - 0x1055b3fff GoogleDataTransport arm64  <3211bf9f70a73f98b63589019bcbbe45> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/GoogleDataTransport.framework/GoogleDataTransport
0x1055cc000 - 0x1055e7fff GoogleUtilities arm64  <7e3fea2af4513403ade663c9eb014daa> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/GoogleUtilities.framework/GoogleUtilities
0x1055fc000 - 0x10561bfff JustLog arm64  <a3b6cce36d113ccb9527982715cf82eb> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/JustLog.framework/JustLog
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0x105660000 - 0x10568bfff SwiftyBeaver arm64  <2119c06216373037b9308d394cfc319a> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/SwiftyBeaver.framework/SwiftyBeaver
0x1056a8000 - 0x1056b3fff iZettleSDK arm64  <88fd2d5f5d503a3983e6b2a3aed867bf> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/iZettleSDK.framework/iZettleSDK
0x1056c0000 - 0x1056e3fff libPhoneNumber_iOS arm64  <8d6e71a239ad356dbb182f9dc187f2c6> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/libPhoneNumber_iOS.framework/libPhoneNumber_iOS
0x105704000 - 0x10570bfff nanopb arm64  <3560c0ac3ddf3cbd8ca0e56839f0d6db> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/nanopb.framework/nanopb
0x105724000 - 0x10578ffff dyld arm64  <b92286197bbb32eeb90d689ac449aa60> /usr/lib/dyld
0x105810000 - 0x1058e7fff iZettlePayments arm64  <a64409e171c939ae80c196ec9da20cc2> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/iZettlePayments.framework/iZettlePayments
0x105940000 - 0x1059f3fff iZettleShared arm64  <c73a7a08b8043a759b74bba09fd138b1> /var/containers/Bundle/Application/C857BD20-2A71-4C4F-8A6B-AAED07EFEC89/Zelty Borne.app/Frameworks/iZettleShared.framework/iZettleShared
0x105adc000 - 0x105ae7fff libobjc-trampolines.dylib arm64  <80646a348ec63d15a5642731a0a01eaa> /usr/lib/libobjc-trampolines.dylib
0x105dac000 - 0x105dbffff GAXClient arm64  <037d49c67b5a3a6d8bae77ecca296a76> /System/Library/AccessibilityBundles/GAXClient.bundle/GAXClient
0x18738f000 - 0x18740dfff libdispatch.dylib arm64  <af27e74cbe4a3364bb27aed9916ce02d> /usr/lib/system/libdispatch.dylib
0x18740e000 - 0x187444fff libdyld.dylib arm64  <0b475c783c123121b7f82b95b83daf44> /usr/lib/system/libdyld.dylib
0x187445000 - 0x18769cfff libicucore.A.dylib arm64  <92f2f395bfe9387994a8c015489a3af4> /usr/lib/libicucore.A.dylib
0x18769d000 - 0x187a46fff CoreFoundation arm64  <f3021642e3c033f89911dd303a6056d0> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x187a47000 - 0x187be1fff CoreServices arm64  <21cf36fcc45436728228b93d58ff00c8> /System/Library/Frameworks/CoreServices.framework/CoreServices
0x187be2000 - 0x187c2afff WirelessDiagnostics arm64  <c87b712e032536f9aabd356ce0854bf5> /System/Library/PrivateFrameworks/WirelessDiagnostics.framework/WirelessDiagnostics
0x187c2b000 - 0x187ca4fff SystemConfiguration arm64  <25b9e2ed36593ef487cf2e7a3270883f> /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration
0x187ca5000 - 0x187d8ffff CoreTelephony arm64  <2c92b898bf6a397eab4d409588151ca4> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony
0x187d90000 - 0x188211fff CFNetwork arm64  <9d46b4f5cd9e31edba2d28f8bdc5e810> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
0x188212000 - 0x1888d7fff libnetwork.dylib arm64  <bfa95fff721f35b3aff7a1e3aeea068b> /usr/lib/libnetwork.dylib
0x1888d8000 - 0x188948fff Accounts arm64  <1e2fba4c0dc03f4d89338072bfe04f16> /System/Library/Frameworks/Accounts.framework/Accounts
0x188949000 - 0x188be3fff Foundation arm64  <712a564e50583eacaf3a43bbd43d0d7e> /System/Library/Frameworks/Foundation.framework/Foundation
0x188be4000 - 0x188f4afff ImageIO arm64  <7517393d394b3426a85f09eff1764832> /System/Library/Frameworks/ImageIO.framework/ImageIO
0x188f4b000 - 0x188f63fff libCGInterfaces.dylib arm64  <940a76a4a65032709a1c714594adb838> /System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/Libraries/libCGInterfaces.dylib
0x188f64000 - 0x1894f3fff CoreGraphics arm64  <57b3d61e4cd130dfb7b476d1ac5c4a16> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
0x1894f4000 - 0x18a8bdfff UIKitCore arm64  <cc6e5ac7824835f68b422e25c93dcf0a> /System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
0x18a8be000 - 0x18a8dbfff libAccessibility.dylib arm64  <62a9b592f12437b5b040338f4d6e54a7> /usr/lib/libAccessibility.dylib
0x18a8dc000 - 0x18ab51fff QuartzCore arm64  <461501dd204f35169f5dbdd0ba19fda1> /System/Library/Frameworks/QuartzCore.framework/QuartzCore
0x18ab52000 - 0x18abb7fff BackBoardServices arm64  <ede04d70146a375ab026b0de23c64900> /System/Library/PrivateFrameworks/BackBoardServices.framework/BackBoardServices
0x18abb8000 - 0x18ac3ffff TextInput arm64  <e039c6aadcf7351892c13176eae7626e> /System/Library/PrivateFrameworks/TextInput.framework/TextInput
0x18ac40000 - 0x18aca7fff libusrtcp.dylib arm64  <de34363495cf339c808d3d6a9c0c6fff> /usr/lib/libusrtcp.dylib
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0x1c1b06000 - 0x1c1b09fff InternationalTextSearch arm64  <f5f3c04464833759becb23a3c9017a2b> /System/Library/PrivateFrameworks/InternationalTextSearch.framework/InternationalTextSearch
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0x1cf339000 - 0x1cf36bfff libxpc.dylib arm64  <9b754030d4b638148840d3dac9c54212> /usr/lib/system/libxpc.dylib
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0x1cfb1d000 - 0x1cfc1cfff AGXMetalA10 arm64  <65afa27898903cacb76aa744e81ae0b7> /System/Library/Extensions/AGXMetalA10.bundle/AGXMetalA10
0x1d05f0000 - 0x1d0602fff SpotlightLinguistics arm64  <8d5151c3bcb131158c230645e5af4066> /System/Library/PrivateFrameworks/SpotlightLinguistics.framework/SpotlightLinguistics

0

Answer 6

DTS Engineer OP

Apple

May ’21

Would this Apple crash report help?

Yes, and no.

It’s clearly the same issue and it helped me track down the bug we’re using to track this (r. 60399638). However, that bug doesn’t offer any suggestions for how you might work around it.

Two factoids of note:

We’re seeing this reported by a number of different apps, suggesting that this is a bug in the system rather than a bug in the apps.
It’s likely that immediate cause of this crash was a change we made in iOS 14 to harden CF-level APIs against type mismatches (r. 14049993). So, this problem may have been occurring previously but iOS 14 is now detecting it reliably.

Oh, one other thing: It’s clear that this bug is triggered by a CF-level problem. That means it affects CFNetServiceBrowser and all the things layered on top of that, including NSNetServiceBrowser and Multipeer Connectivity. If you move to a different Bonjour API, one not based on CFNetServiceBrowser, it’s likely that you wouldn’t see this problem. That includes NWBrowser and the very low-level DNS-SD API (<dns_sd.h>). Of those, I’m going to recommend NWBrowser; Network framework is the future of (non-HTTP) networking on our platforms.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 7

DTS Engineer OP

Apple

Aug ’21

So has this bug been fixed?

Our current thinking is that the bug mentioned above (r. 60399638) is specific to Multipeer Connectivity. Are you using that API? Or some other Bonjour API?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 8

DTS Engineer OP

Apple

Sep ’21

Is there any update to the status of this bug (r. 60399638)?

No.

Are there any workarounds

As I said in my previous post, our current thinking is that this is specific to Multipeer Connectivity, and thus the ‘obvious’ workaround is to use a different API for your networking. My general recommendation is Network framework but if you want to talk specifics I encourage you to start a new thread with details about your network architecture.

an estimated timeline for a fix?

I can’t predict the future, alas. I will, however, note this problem started in iOS 14 and hasn’t been fixed in iOS 15, and let you draw your own conclusions.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 9

Anil_Makhija OP

Feb ’24

We are facing a similar, intermittent crash, observed in iPad Pro (12.9-inch, 3rd generation) Version:17.2.0 real devices

Fatal Exception: NSInternalInconsistencyException 0 CoreFoundation 0xf2564 (Missing UUID 47e4ec098f6e30a899d034024d4f8122) 1 libobjc.A.dylib 0x19eb4 (Missing UUID 9bab95567a2a30a8acde010ba8e2367d) 2 Foundation 0x82940 (Missing UUID 9558b1ebdda33fda88a5e785ecdfcd30) 3 Foundation 0xe0ee0 (Missing UUID 9558b1ebdda33fda88a5e785ecdfcd30) 4 Foundation 0x75af30 (Missing UUID 9558b1ebdda33fda88a5e785ecdfcd30) 5 AppKit 0x7cbf8 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 6 AppKit 0xad154c (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 7 AppKit 0x31e5b4 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 8 AppKit 0x33e1c0 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 9 AppKit 0xde1a74 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 10 AppKit 0x347e4 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 11 AppKit 0xde159c (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 12 AppKit 0xde0f54 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 13 AppKit 0xde112c (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 14 AppKit 0x7a695c (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 15 AppKit 0x7a6ce4 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 16 SkyLight 0xb134 (Missing UUID 67c718b452dc3b258e7a12ea2b414369) 17 SkyLight 0x3a0230 (Missing UUID 67c718b452dc3b258e7a12ea2b414369) 18 SkyLight 0x3a012c (Missing UUID 67c718b452dc3b258e7a12ea2b414369) 19 libdispatch.dylib 0x1cb8 (Missing UUID a53d555df748301083fe385c660a81bd) 20 libdispatch.dylib 0x3910 (Missing UUID a53d555df748301083fe385c660a81bd) 21 libdispatch.dylib 0x11fa8 (Missing UUID a53d555df748301083fe385c660a81bd) 22 libdispatch.dylib 0x11bc0 (Missing UUID a53d555df748301083fe385c660a81bd) 23 CoreFoundation 0xbeecc (Missing UUID 47e4ec098f6e30a899d034024d4f8122) 24 CoreFoundation 0x7c7d0 (Missing UUID 47e4ec098f6e30a899d034024d4f8122) 25 CoreFoundation 0x7b9ac (Missing UUID 47e4ec098f6e30a899d034024d4f8122) 26 HIToolbox 0x30448 (Missing UUID e2187dfe1fb43b47874ea0a6291e51b2) 27 HIToolbox 0x30284 (Missing UUID e2187dfe1fb43b47874ea0a6291e51b2) 28 HIToolbox 0x2ffdc (Missing UUID e2187dfe1fb43b47874ea0a6291e51b2) 29 AppKit 0x398a4 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 30 AppKit 0x813980 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 31 AppKit 0x2cd50 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 32 AppKit 0x4014 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 33 AppKit 0x2573a4 (Missing UUID f3527312e4263f7cb77b2bf49d1b7c04) 34 UIKitMacHelper 0x46a8 (Missing UUID f03f3f95a13739e2b894c76dc6e8a1e5) 35 UIKitCore 0x3cfc (Missing UUID 2aebcc42a1aa3535be531da03d4d2ce3) 36 Enlighten 0x70e8 main + 32 (main.m:32) 37 ??? 0x183ef50e0 (Missing)

0

Answer 10

tapework OP

May ’24

Any updates on this crash / fix / rdar? We are also seeing this crash. Even when the app is in foreground. It happens randomly. Hard to reproduce.

0

Answer 11

DTS Engineer OP

Apple

May ’24

Are you using Multipeer Connectivity?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 12

tapework OP

May ’24

For details , see my attached crash log

2024-04-22_14-55-46.3894_+0200-498fa0a5137ba58fc535e918e393ed2c2efa174a.crash

Incident Identifier: 2883D85C-6933-4FF9-A0D9-AA17EFE071B8
Distributor ID:      com.apple.TestFlight
Hardware Model:      iPhone15,3
Process:             Groupetto [32855]
Path:                /private/var/containers/Bundle/Application/F89EB213-F98D-422F-B9E6-A123CBEBBE71/Groupetto.app/Groupetto
Identifier:          app.groupetto.ios
Version:             2.0.0 (15)
AppStoreTools:       15E204
AppVariant:          1:iPhone15,3:17.4
Beta:                YES
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           app.groupetto.ios [9911]

Date/Time:           2024-04-22 14:55:46.3894 +0200
Launch Time:         2024-04-22 14:47:29.7149 +0200
OS Version:          iPhone OS 17.4.1 (21E236)
Release Type:        User
Baseband Version:    2.51.04
Report Version:      104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x000000018860d0fc
Termination Reason: SIGNAL 5 Trace/BPT trap: 5
Terminating Process: exc handler [32855]

Triggered by Thread:  0


Thread 0 name:
Thread 0 Crashed:
0   CoreFoundation                	0x000000018860d0fc _CFAssertMismatchedTypeID + 112 (CFRuntime.c:1135)
1   CoreFoundation                	0x0000000188464dd4 CFRunLoopSourceInvalidate + 304 (CFRunLoop.c:4290)
2   CFNetwork                     	0x00000001895e6c58 _BrowserCancel(__CFNetServiceBrowser*) + 120 (CFNetServiceBrowser.c:179)
3   CoreFoundation                	0x000000018848d62c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1957)
4   CoreFoundation                	0x000000018848c8a8 __CFRunLoopDoSource0 + 176 (CFRunLoop.c:2001)
5   CoreFoundation                	0x000000018848b0b8 __CFRunLoopDoSources0 + 340 (CFRunLoop.c:2046)
6   CoreFoundation                	0x0000000188489d88 __CFRunLoopRun + 828 (CFRunLoop.c:2955)
7   CoreFoundation                	0x0000000188489968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
8   GraphicsServices              	0x00000001cc77f4e0 GSEventRunModal + 164 (GSEvent.c:2196)
9   UIKitCore                     	0x000000018a8fcedc -[UIApplication _run] + 888 (UIApplication.m:3692)
10  UIKitCore                     	0x000000018a8fc518 UIApplicationMain + 340 (UIApplication.m:5282)
11  UIKitCore                     	0x000000018ab35734 UIApplicationMain(_:_:_:_:) + 104 (UIKit.swift:539)
12  Groupetto                     	0x00000001048bd030 specialized static UIApplicationDelegate.main() + 28 (:11)
13  Groupetto                     	0x00000001048bd030 static AppDelegate.$main() + 28 (AppDelegate.swift:0)
14  Groupetto                     	0x00000001048bd030 main + 116
15  dyld                          	0x00000001ab9aad84 start + 2240 (dyldMain.cpp:1298)

Thread 1 name:
Thread 1:
0   libsystem_kernel.dylib        	0x00000001d09b1af8 mach_msg2_trap + 8 (:-1)
1   libsystem_kernel.dylib        	0x00000001d09b1890 mach_msg2_internal + 80 (mach_msg.c:201)
2   libsystem_kernel.dylib        	0x00000001d09b17a8 mach_msg_overwrite + 436 (mach_msg.c:0)
3   libsystem_kernel.dylib        	0x00000001d09b15e8 mach_msg + 24 (mach_msg.c:323)
4   CoreFoundation                	0x000000018848c01c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624)
5   CoreFoundation                	0x0000000188489f04 __CFRunLoopRun + 1208 (CFRunLoop.c:3007)
6   CoreFoundation                	0x0000000188489968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
7   Foundation                    	0x00000001873184a8 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212 (NSRunLoop.m:373)
8   Foundation                    	0x00000001873424e8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 64 (NSRunLoop.m:420)
9   UIKitCore                     	0x000000018a85fac8 -[UIEventFetcher threadMain] + 420 (UIEventFetcher.m:1201)
10  Foundation                    	0x0000000187389a9c __NSThread__start__ + 732 (NSThread.m:991)
11  libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
12  libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 2 name:
Thread 2:
0   libsystem_kernel.dylib        	0x00000001d09b1af8 mach_msg2_trap + 8 (:-1)
1   libsystem_kernel.dylib        	0x00000001d09b1890 mach_msg2_internal + 80 (mach_msg.c:201)
2   libsystem_kernel.dylib        	0x00000001d09b17a8 mach_msg_overwrite + 436 (mach_msg.c:0)
3   libsystem_kernel.dylib        	0x00000001d09b15e8 mach_msg + 24 (mach_msg.c:323)
4   CoreFoundation                	0x000000018848c01c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624)
5   CoreFoundation                	0x0000000188489f04 __CFRunLoopRun + 1208 (CFRunLoop.c:3007)
6   CoreFoundation                	0x0000000188489968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
7   CoreFoundation                	0x00000001884896cc CFRunLoopRun + 64 (CFRunLoop.c:3446)
8   CoreMotion                    	0x00000001954563c0 CLMotionCore::runMotionThread(void*) + 1292 (CLMotionCore.mm:376)
9   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
10  libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 3 name:
Thread 3:
0   libsystem_kernel.dylib        	0x00000001d09be220 __select + 8 (:-1)
1   MultipeerConnectivity         	0x00000001ffc68e78 gckSessionRecvProc + 6236 (GCKSession.c:4455)
2   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
3   libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 4 name:
Thread 4:
0   libsystem_kernel.dylib        	0x00000001d09be220 __select + 8 (:-1)
1   MultipeerConnectivity         	0x00000001ffc694b0 gckSessionSendProc + 404 (GCKSession.c:4586)
2   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
3   libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 5 name:
Thread 5:
0   libsystem_kernel.dylib        	0x00000001d09b249c __psynch_cvwait + 8 (:-1)
1   libsystem_pthread.dylib       	0x00000001e4438590 _pthread_cond_wait + 1228 (pthread_cond.c:862)
2   MultipeerConnectivity         	0x00000001ffc7f780 EventCBProc + 84 (EventCallback.c:27)
3   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
4   libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 6 name:
Thread 6:
0   libsystem_kernel.dylib        	0x00000001d09be220 __select + 8 (:-1)
1   CoreFoundation                	0x0000000188535bf0 __CFSocketManager + 640 (CFSocket.c:1340)
2   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
3   libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 7 name:
Thread 7:
0   libsystem_kernel.dylib        	0x00000001d09b1af8 mach_msg2_trap + 8 (:-1)
1   libsystem_kernel.dylib        	0x00000001d09b1890 mach_msg2_internal + 80 (mach_msg.c:201)
2   libsystem_kernel.dylib        	0x00000001d09b17a8 mach_msg_overwrite + 436 (mach_msg.c:0)
3   libsystem_kernel.dylib        	0x00000001d09b15e8 mach_msg + 24 (mach_msg.c:323)
4   CoreFoundation                	0x000000018848c01c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624)
5   CoreFoundation                	0x0000000188489f04 __CFRunLoopRun + 1208 (CFRunLoop.c:3007)
6   CoreFoundation                	0x0000000188489968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
7   CoreFoundation                	0x0000000188594874 _legacyStreamRunLoop_workThread + 300 (CFStream.c:1776)
8   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
9   libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 8 name:
Thread 8:
0   libsystem_kernel.dylib        	0x00000001d09b1af8 mach_msg2_trap + 8 (:-1)
1   libsystem_kernel.dylib        	0x00000001d09b1890 mach_msg2_internal + 80 (mach_msg.c:201)
2   libsystem_kernel.dylib        	0x00000001d09b17a8 mach_msg_overwrite + 436 (mach_msg.c:0)
3   libsystem_kernel.dylib        	0x00000001d09b15e8 mach_msg + 24 (mach_msg.c:323)
4   CoreFoundation                	0x000000018848c01c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624)
5   CoreFoundation                	0x0000000188489f04 __CFRunLoopRun + 1208 (CFRunLoop.c:3007)
6   CoreFoundation                	0x0000000188489968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
7   CFNetwork                     	0x00000001897e8c48 +[__CFN_CoreSchedulingSetRunnable _run:] + 384 (CoreSchedulingSet.mm:1479)
8   Foundation                    	0x0000000187389a9c __NSThread__start__ + 732 (NSThread.m:991)
9   libsystem_pthread.dylib       	0x00000001e4439a90 _pthread_start + 136 (pthread.c:927)
10  libsystem_pthread.dylib       	0x00000001e4438fcc thread_start + 8 (:-1)

Thread 9:
0   libsystem_pthread.dylib       	0x00000001e4438fb8 start_wqthread + 0 (:-1)

Thread 10:
0   libsystem_pthread.dylib       	0x00000001e4438fb8 start_wqthread + 0 (:-1)

Thread 11:
0   libsystem_pthread.dylib       	0x00000001e4438fb8 start_wqthread + 0 (:-1)

Thread 12 name:
Thread 12:
0   libsystem_kernel.dylib        	0x00000001d09be24c __select_nocancel + 8 (:-1)
1   libsystem_dnssd.dylib         	0x00000001e437a570 deliver_request + 692 (dnssd_clientstub.c:1282)
2   libsystem_dnssd.dylib         	0x00000001e437e2b8 DNSServiceRegisterInternal + 704 (dnssd_clientstub.c:2461)
3   libsystem_dnssd.dylib         	0x00000001e437dfec DNSServiceRegister + 44 (dnssd_clientstub.c:2360)
4   CFNetwork                     	0x00000001895ecc24 CFNetServiceRegisterWithOptions + 572 (CFNetServices.c:1529)
5   CFNetwork                     	0x0000000189759e74 -[NSNetService _internal_publishWithOptions:] + 200 (NSNetServices.mm:293)
6   CFNetwork                     	0x0000000189759cbc -[NSNetService publishWithOptions:] + 652 (NSNetServices.mm:386)
7   MultipeerConnectivity         	0x00000001ffc75310 -[MCNearbyServiceAdvertiser syncStartAdvertisingPeer] + 412 (MCNearbyServiceAdvertiser.m:248)
8   libdispatch.dylib             	0x000000019035113c _dispatch_call_block_and_release + 32 (init.c:1530)
9   libdispatch.dylib             	0x0000000190352dd4 _dispatch_client_callout + 20 (object.m:576)
10  libdispatch.dylib             	0x000000019035a400 _dispatch_lane_serial_drain + 748 (queue.c:3900)
11  libdispatch.dylib             	0x000000019035af30 _dispatch_lane_invoke + 380 (queue.c:3991)
12  libdispatch.dylib             	0x0000000190365cb4 _dispatch_root_queue_drain_deferred_wlh + 288 (queue.c:6998)
13  libdispatch.dylib             	0x0000000190365528 _dispatch_workloop_worker_thread + 404 (queue.c:6592)
14  libsystem_pthread.dylib       	0x00000001e4438f20 _pthread_wqthread + 288 (pthread.c:2665)
15  libsystem_pthread.dylib       	0x00000001e4438fc0 start_wqthread + 8 (:-1)

Thread 13:
0   libsystem_pthread.dylib       	0x00000001e4438fb8 start_wqthread + 0 (:-1)

Thread 14:
0   libsystem_pthread.dylib       	0x00000001e4438fb8 start_wqthread + 0 (:-1)


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x000000000000004f   x1: 0x00000001887b4178   x2: 0x0000000000000000   x3: 0x000000016b5ae640
    x4: 0x0000000000000000   x5: 0x000000016b5ae5d0   x6: 0x0000000000000029   x7: 0x00000000ffffffff
    x8: 0x00000001eaa3c000   x9: 0xad6b13e797740079  x10: 0x0000000000000200  x11: 0x000000016b5ae140
   x12: 0x0000000000000000  x13: 0x0000000000017800  x14: 0x0000000000000010  x15: 0x0000000000000000
   x16: 0x0000000198612960  x17: 0x00000001f4b605d8  x18: 0x0000000000000000  x19: 0x000000016b5ae5f1
   x20: 0x000000000000002e  x21: 0x00000001887ab483  x22: 0x00000001887b35ae  x23: 0x000000018975b708
   x24: 0x0000000301678250  x25: 0x0000000000000002  x26: 0x0000000000000000  x27: 0x00000000211200d5
   x28: 0x0000000000000001   fp: 0x000000016b5ae720   lr: 0x7e5a00018860d0f4
    sp: 0x000000016b5ae5d0   pc: 0x000000018860d0fc cpsr: 0x60001000
   esr: 0xf2000001 (Breakpoint) brk 1


Binary Images:
        0x104850000 -         0x104a2ffff Groupetto arm64  <49eb40fbdae23e8baea1ae2ba4f6b3ba> /private/var/containers/Bundle/Application/F89EB213-F98D-422F-B9E6-A123CBEBBE71/Groupetto.app/Groupetto
        0x104cb8000 -         0x104cc3fff libobjc-trampolines.dylib arm64e  <19bc6b58cbf535a583a5fc742451547d> /private/preboot/Cryptexes/OS/usr/lib/libobjc-trampolines.dylib
        0x1872ed000 -         0x187e78fff Foundation arm64e   /System/Library/Frameworks/Foundation.framework/Foundation
        0x188456000 -         0x188983fff CoreFoundation arm64e  <3a5f992ad1cd312ebd2ef7c66343a417> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
        0x18958e000 -         0x18996afff CFNetwork arm64e   /System/Library/Frameworks/CFNetwork.framework/CFNetwork
        0x18a6d2000 -         0x18c1e2fff UIKitCore arm64e  <7bf01cfc23f1326aafd8ad967ffece28> /System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
        0x19034f000 -         0x190395fff libdispatch.dylib arm64e   /usr/lib/system/libdispatch.dylib
        0x190396000 -         0x190413fff libsystem_c.dylib arm64e  <3b5201c515d0335fa91d0c63e1f6c6dc> /usr/lib/system/libsystem_c.dylib
        0x19516d000 -         0x195636fff CoreMotion arm64e  <1e51658a881b3bbb95c26c7c9701e878> /System/Library/Frameworks/CoreMotion.framework/CoreMotion
        0x19860b000 -         0x198640fff libsystem_malloc.dylib arm64e   /usr/lib/system/libsystem_malloc.dylib
        0x1ab9a5000 -         0x1aba31be3 dyld arm64e  <7be2b7573b3d3e918cb774f3887660c7> /usr/lib/dyld
        0x1cc77c000 -         0x1cc784fff GraphicsServices arm64e  <4cb7e98636bf38018f495d8c3c4a2127> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
        0x1d09b0000 -         0x1d09e9fef libsystem_kernel.dylib arm64e   /usr/lib/system/libsystem_kernel.dylib
        0x1e4379000 -         0x1e4381fff libsystem_dnssd.dylib arm64e  <937503b9a8a537c3b9b005eaf11262f0> /usr/lib/system/libsystem_dnssd.dylib
        0x1e4437000 -         0x1e4443fff libsystem_pthread.dylib arm64e   /usr/lib/system/libsystem_pthread.dylib
        0x1ffc53000 -         0x1ffc9dfff MultipeerConnectivity arm64e  <23960eb0a5783e04bfc0688ee6f48385> /System/Library/Frameworks/MultipeerConnectivity.framework/MultipeerConnectivity

EOF

The interesting part is in 2 CFNetwork 0x00000001895e6c58 _BrowserCancel(__CFNetServiceBrowser*) + 120 (CFNetServiceBrowser.c:179)

which can be opened here: https://opensource.apple.com/source/CFNetwork/CFNetwork-129.18/NetServices/CFNetServiceBrowser.c.auto.html


/* static */ void
_BrowserCancel(__CFNetServiceBrowser* browser) {
	
	CFNetServiceBrowserClientCallBack cb = NULL;
	CFStreamError error;
	void* info = NULL;
	
	// Retain here to guarantee safety really after the browser release,
	// but definitely before the callback.
	CFRetain(browser);
	
	// Lock the browser
	__CFSpinLock(&browser->_lock);
	
	// If the browse canceled, don't need to do any of this.
	if (browser->_trigger) {
		
		// Save the callback if there is one at this time.
		cb = browser->_callback;
		
		// Save the error and client information for the callback
		memmove(&error, &(browser->_error), sizeof(error));
		info = browser->_client.info;
		
		// Remove the trigger from run loops and modes
		_CFTypeUnscheduleFromMultipleRunLoops(browser->_trigger, browser->_schedules);
		
		// Invalidate the run loop source that got here
		CFRunLoopSourceInvalidate((CFRunLoopSourceRef)(browser->_trigger));
		
		// Release the trigger now.
		CFRelease(browser->_trigger);
		browser->_trigger = NULL;
	}

	// Unlock the browser so the callback can be made safely.
	__CFSpinUnlock(&browser->_lock);
	
	// If there is a callback, inform the client of the finish.
	if (cb)
		cb((CFNetServiceBrowserRef)browser, 0, NULL, &error, info);
	
	// Go ahead and release now that the callback is done.
	CFRelease(browser);
}

the CFRunLoopSourceInvalidate causes the crash? There is a lock. But might be not correct?

0

Answer 13

DTS Engineer OP

Apple

May ’24

Recommended

Yes. using Multipeer Connectivity

OK. In that case my answer is that you should stop using Multipeer Connectivity. This is a long-standing bug and, while I can’t predict the future with 100% accuracy, I think it’s reasonable to infer future behaviour from past behaviour. In this case, you’re looking at a crashing bug that’s been around for at least 3 years old [1]. How long are you prepared to wait for a fix?

IMO Multipeer Connectivity should be officially deprecated in favour of Network framework [2]. If you’d like to make that transition:

Check out the Building a custom peer-to-peer protocol sample code.
If you get, stuck a new thread with the details. Tag it with Network so that I see it.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

[1] Based on the age of this thread. I suspect that this bug has been around for much longer than that.

[2] And, to be clear, this is a personal opinion. I don’t set official Apple policy for this stuff. The official policy is in TN3151 Choosing the right networking API, which has to walk a fine line because Multipeer Connectivity isn’t officially deprecated.

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Answer 14

DTS Engineer OP

Apple

May ’24

Network framework is also compatible with Nearby Interaction and background?

I’m not particularly au fait with NI, but as a general rule Network framework can do anything that Multipeer Connectivity can do (and more). It’s really a question of focus. Multipeer Connectivity expects you to use the network in a specific way, and provides a high-level API based on that. Network framework is very generic. That means that in some cases you have to do a little more work to achieve a specific goal with Network framework than with Multipeer Connectivity. But, on the upside:

It’s more reliable.
It lets you design on-the-wire architecture that matches your problem domain.

If you have questions about how to achieve a specific goal, I recommend that you put them in a new thread.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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