One of my apps crashes only on iOS 14 real device (simulator works just fine) when UITextField is touched or becomeFirstResponder, even touch on UISearchBar text area result in a crash.
Only happens on the Real device (no simulator) Only happens with the OS keyboard. Tried Grammarly keyboard. It works fine. Build on Xcode 11.* versions also make the app crash on iOS14 devices Tried building the app with different computers. Did not work. Tried connecting an external keyboard. Did not work
The stack trace does not help. Finally, I was able to get this message printed on the console.
*** Assertion failure in -[UIKBCacheToken stringForConstruction:], UIKBCacheToken.m:204
The above message gets printed recursively.
The crash log below does not help either. I have tried symbolic breakpoints, All sorts of debugging techniques, and restarting the device, even resetting device setting, also tried creating a completely new view controller with one UITextField.
Exception Subtype: KERN_PROTECTION_FAILURE at 0x000000016d6a3ff0
VM Region Info: 0x16d6a3ff0 is in 0x16d6a0000-0x16d6a4000; bytes after start: 16368 bytes before end: 15
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
mapped file 11b8b8000-11bb00000 [ 2336K] r--/r-- SM=PRV ...ct_id=598bee3
GAP OF 0x51ba0000 BYTES
---> STACK GUARD 16d6a0000-16d6a4000 [ 16K] ---/rwx SM=NUL ... for thread 0
Stack 16d6a4000-16d7a0000 [ 1008K] rw-/rwx SM=COW thread 0
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [1013]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_notify.dylib 0x0000000189b42b20 notify_check + 8
1 libsystem_c.dylib 0x00000001879cda78 notify_check_tz + 40
2 libsystem_c.dylib 0x00000001879cd61c tzsetwall_basic + 76
3 libsystem_c.dylib 0x00000001879cf640 localtime_r + 52
4 libsystem_trace.dylib 0x00000001879364c8 _os_activity_stream_reflect + 348
5 libsystem_trace.dylib 0x0000000187942530 _os_log_impl_stream + 456
6 libsystem_trace.dylib 0x0000000187942034 _os_log_impl_flatten_and_send + 7084
7 libsystem_trace.dylib 0x00000001879436f0 _os_log_with_args_impl + 388
8 CoreFoundation 0x0000000187d4a2a8 _CFLogvEx3 + 188
9 Foundation 0x000000018819e894 _NSLogv + 124
10 Foundation 0x000000018819e8e4 NSLog + 56
11 Foundation 0x00000001880e45ec -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 84
12 UIKitCore 0x000000018c124a20 0x18b92e000 + 8350240
13 UIKitCore 0x000000018c124aac 0x18b92e000 + 8350380
14 UIKitCore 0x000000018c1250b0 0x18b92e000 + 8351920
15 CoreFoundation 0x0000000187c6b93c -[NSObject+ 153916 (NSObject) _copyDescription] + 48
16 CoreFoundation 0x0000000187d08ab0 __CFStringAppendFormatCore + 12640
17 CoreFoundation 0x0000000187d09738 _CFStringCreateWithFormatAndArgumentsReturningMetadata + 164
18 CoreFoundation 0x0000000187c706f4 +[NSException raise:format:arguments:] + 64
19 Foundation 0x00000001880e461c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 132
20 UIKitCore 0x000000018c124a20 0x18b92e000 + 8350240
21 UIKitCore 0x000000018c124aac 0x18b92e000 + 8350380
22 UIKitCore 0x000000018c1250b0 0x18b92e000 + 8351920
23 CoreFoundation 0x0000000187c6b93c -[NSObject+ 153916 (NSObject) _copyDescription] + 48
24 CoreFoundation 0x0000000187d08ab0 __CFStringAppendFormatCore + 12640
25 CoreFoundation 0x0000000187d09738 _CFStringCreateWithFormatAndArgumentsReturningMetadata + 164
26 CoreFoundation 0x0000000187c706f4 +[NSException raise:format:arguments:] + 64
27 Foundation 0x00000001880e461c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 132
28 UIKitCore 0x000000018c124a20 0x18b92e000 + 8350240
29 UIKitCore 0x000000018c124aac 0x18b92e000 + 8350380
30 UIKitCore 0x000000018c1250b0 0x18b92e000 + 8351920
31 CoreFoundation 0x0000000187c6b93c -[NSObject+ 153916 (NSObject) _copyDescription] + 48
32 CoreFoundation 0x0000000187d08ab0 __CFStringAppendFormatCore + 12640
33 CoreFoundation 0x0000000187d09738 _CFStringCreateWithFormatAndArgumentsReturningMetadata + 164
34 CoreFoundation 0x0000000187c706f4 +[NSException raise:format:arguments:] + 64
35 Foundation 0x00000001880e461c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 132
36 UIKitCore 0x000000018c124a20 0x18b92e000 + 8350240
37 UIKitCore 0x000000018c124aac 0x18b92e000 + 8350380
38 UIKitCore 0x000000018c1250b0 0x18b92e000 + 8351920
39 CoreFoundation 0x0000000187c6b93c -[NSObject+ 153916 (NSObject) _copyDescription] + 48
40 CoreFoundation 0x0000000187d08ab0 __CFStringAppendFormatCore + 12640
41 CoreFoundation 0x0000000187d09738 _CFStringCreateWithFormatAndArgumentsReturningMetadata + 164
42 CoreFoundation 0x0000000187c706f4 +[NSException raise:format:arguments:] + 64
