In iOS 18, we encountered a crash:
Thread 4 name: com.apple.root.user-interactive-qos
Thread 4 Crashed:
0 CoreFoundation 0x18c4f9b10 __CFCheckCFInfoPACSignature + 4
1 CoreFoundation 0x18c53ed64 CFBundleGetInfoDictionary + 24
2 CoreFoundation 0x18c53ed1c CFBundleGetIdentifier + 16
3 Foundation 0x18b153740 -[NSUserDefaults(NSUserDefaults) _initWithSuiteName:container:] + 84
4 UIKitCore 0x18ef26ef0 ___UIKitUserDefaults_block_invoke + 40
5 libdispatch.dylib 0x1941ee0d0 _dispatch_client_callout + 20
6 libdispatch.dylib 0x1941ef918 _dispatch_once_callout + 32
7 UIKitCore 0x18ef9de28 _UIKitUserDefaults + 80
8 UIKitCore 0x18f058a7c ___UIKitPreferencesOnce_block_invoke + 20
9 libdispatch.dylib 0x1941ee0d0 _dispatch_client_callout + 20
10 libdispatch.dylib 0x1941ef918 _dispatch_once_callout + 32
11 UIKitCore 0x18f056c8c _UIKitPreferencesOnce + 80
12 UIKitCore 0x18f0563b8 ___UIApplicationMainPreparations_block_invoke + 20
13 libdispatch.dylib 0x1941ec370 _dispatch_call_block_and_release + 32
14 libdispatch.dylib 0x1941ee0d0 _dispatch_client_callout + 20
15 libdispatch.dylib 0x1941fff60 _dispatch_root_queue_drain + 860
16 libdispatch.dylib 0x194200590 _dispatch_worker_thread2 + 156
17 libsystem_pthread.dylib 0x2136ffc40 _pthread_wqthread + 228
18 libsystem_pthread.dylib 0x2136fc488 start_wqthread + 8
Below image show more details:
And after set a symbol breakpoint:
[NSUserDefaults _initWithSuiteName:container:]
We found that at the beginning of app launch, the system will call it:
It not always crash, but sometimes especially when app upgrade, what the root cause maybe?
