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[coco8] BUG: strange error report in Xcode backup console (iOS 9.3)
The Xcode debug console reported an error situation where they are not triggering an exception.
The system did not crash but we canīt warty it is stable at VM level.
Symptom
The error happens when we was downloading a file and opened an Alert box after the download complete.
See FileDownload>>#example
Reproducible?
The error was NOT reported all times we run the test.
Dump of error
2016-04-10 15:58:06.673 coco8[795:360387] This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
Stack:(
0 CoreFoundation 0x00000001825eee50 <redacted> + 148
1 libobjc.A.dylib 0x0000000181c53f80 objc_exception_throw + 56
2 CoreFoundation 0x00000001825eed80 <redacted> + 0
3 Foundation 0x000000018309fafc <redacted> + 88
4 Foundation 0x0000000182f20ccc <redacted> + 36
5 UIKit 0x0000000187fcb7c0 <redacted> + 912
6 UIKit 0x0000000187fccd38 <redacted> + 788
7 UIKit 0x0000000187fcc96c <redacted> + 296
8 UIKit 0x000000018809c3b8 <redacted> + 480
9 UIKit 0x0000000188099380 <redacted> + 172
10 UIKit 0x00000001880995f0 <redacted> + 96
11 UIKit 0x0000000188099ab4 <redacted> + 80
12 UIKit 0x000000018809e080 <redacted> + 492
13 UIKit 0x000000018809d1ec <redacted> + 148
14 UIKit 0x000000018809d12c <redacted> + 284
15 UIKit 0x0000000187badf90 <redacted> + 444
16 UIKit 0x0000000187bae064 <redacted> + 60
17 UIKit 0x0000000187bae1a4 <redacted> + 28
18 UIKit 0x0000000187bad754 <redacted> + 100
19 UIKit 0x0000000187738b40 <redacted> + 996
20 UIKit 0x0000000187738744 <redacted> + 28
21 UIKit 0x0000000187ac0138 <redacted> + 108
22 UIKit 0x0000000187ab92c8 <redacted> + 1328
23 UIKit 0x0000000187abad64 <redacted> + 4644
24 UIKit 0x0000000187abd7a0 <redacted> + 472
25 UIKit 0x00000001878332b4 <redacted> + 184
26 UIKit 0x000000018808a5c4 <redacted> + 512
27 UIKit 0x0000000188088b78 <redacted> + 228
28 UIKit 0x0000000187bbe534 <redacted> + 260
29 coco8 0x00000001000e20a8 ffi_call_SYSV + 100
30 coco8 0x00000001000e0738 ffi_call + 176
31 coco8 0x0000000100096e5c jsCocoaObject_getProperty + 4624
32 JavaScriptCore 0x000000018603eb5c <redacted> + 324
33 JavaScriptCore 0x0000000185ca693c <redacted> + 1248
34 JavaScriptCore 0x00000001860ea7c0 <redacted> + 9936
35 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
36 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
37 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
38 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
39 JavaScriptCore 0x00000001860edf14 <redacted> + 24100
40 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
41 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
42 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
43 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
44 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
45 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
46 JavaScriptCore 0x00000001860e7ed8 <redacted> + 312
47 JavaScriptCore 0x00000001860139fc <redacted> + 180
48 JavaScriptCore 0x0000000185cb266c <redacted> + 400
49 JavaScriptCore 0x0000000185cb241c JSObjectCallAsFunction + 520
50 coco8 0x00000001000c26b8 +[BurksPool callSelector:ofInstance:writeContext:withArguments:] + 1328
51 coco8 0x00000001000c0f0c -[BurksPool v_id:id:id:] + 128
52 CFNetwork 0x0000000182cfdbac <redacted> + 36
53 Foundation 0x0000000182fa8510 <redacted> + 16
54 Foundation 0x0000000182efa900 <redacted> + 96
55 Foundation 0x0000000182eeaed8 <redacted> + 604
56 Foundation 0x0000000182faa904 <redacted> + 224
57 libdispatch.dylib 0x00000001001c5a3c _dispatch_client_callout + 16
58 libdispatch.dylib 0x00000001001d2554 _dispatch_queue_drain + 1036
59 libdispatch.dylib 0x00000001001c972c _dispatch_queue_invoke + 464
60 libdispatch.dylib 0x00000001001d466c _dispatch_root_queue_drain + 760
61 libdispatch.dylib 0x00000001001d4364 _dispatch_worker_thread3 + 132
62 libsystem_pthread.dylib 0x0000000182251470 _pthread_wqthread + 1092
63 libsystem_pthread.dylib 0x0000000182251020 start_wqthread + 4
)
2016-04-10 15:58:06.694 coco8[795:360387] This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
Stack:(
0 CoreFoundation 0x00000001825eee50 <redacted> + 148
1 libobjc.A.dylib 0x0000000181c53f80 objc_exception_throw + 56
2 CoreFoundation 0x00000001825eed80 <redacted> + 0
3 Foundation 0x000000018309fafc <redacted> + 88
4 Foundation 0x000000018309f9c0 <redacted> + 56
5 Foundation 0x0000000182f251ec <redacted> + 56
6 Foundation 0x0000000182f20dac <redacted> + 260
7 UIKit 0x0000000187fcb7c0 <redacted> + 912
8 UIKit 0x0000000187fccd38 <redacted> + 788
9 UIKit 0x0000000187fcc96c <redacted> + 296
10 UIKit 0x000000018809c3b8 <redacted> + 480
11 UIKit 0x0000000188099380 <redacted> + 172
12 UIKit 0x00000001880995f0 <redacted> + 96
13 UIKit 0x0000000188099ab4 <redacted> + 80
14 UIKit 0x000000018809e080 <redacted> + 492
15 UIKit 0x000000018809d1ec <redacted> + 148
16 UIKit 0x000000018809d12c <redacted> + 284
17 UIKit 0x0000000187badf90 <redacted> + 444
18 UIKit 0x0000000187bae064 <redacted> + 60
19 UIKit 0x0000000187bae1a4 <redacted> + 28
20 UIKit 0x0000000187bad754 <redacted> + 100
21 UIKit 0x0000000187738b40 <redacted> + 996
22 UIKit 0x0000000187738744 <redacted> + 28
23 UIKit 0x0000000187ac0138 <redacted> + 108
24 UIKit 0x0000000187ab92c8 <redacted> + 1328
25 UIKit 0x0000000187abad64 <redacted> + 4644
26 UIKit 0x0000000187abd7a0 <redacted> + 472
27 UIKit 0x00000001878332b4 <redacted> + 184
28 UIKit 0x000000018808a5c4 <redacted> + 512
29 UIKit 0x0000000188088b78 <redacted> + 228
30 UIKit 0x0000000187bbe534 <redacted> + 260
31 coco8 0x00000001000e20a8 ffi_call_SYSV + 100
32 coco8 0x00000001000e0738 ffi_call + 176
33 coco8 0x0000000100096e5c jsCocoaObject_getProperty + 4624
34 JavaScriptCore 0x000000018603eb5c <redacted> + 324
35 JavaScriptCore 0x0000000185ca693c <redacted> + 1248
36 JavaScriptCore 0x00000001860ea7c0 <redacted> + 9936
37 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
38 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
39 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
40 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
41 JavaScriptCore 0x00000001860edf14 <redacted> + 24100
42 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
43 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
44 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
45 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
46 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
47 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
48 JavaScriptCore 0x00000001860e7ed8 <redacted> + 312
49 JavaScriptCore 0x00000001860139fc <redacted> + 180
50 JavaScriptCore 0x0000000185cb266c <redacted> + 400
51 JavaScriptCore 0x0000000185cb241c JSObjectCallAsFunction + 520
52 coco8 0x00000001000c26b8 +[BurksPool callSelector:ofInstance:writeContext:withArguments:] + 1328
53 coco8 0x00000001000c0f0c -[BurksPool v_id:id:id:] + 128
54 CFNetwork 0x0000000182cfdbac <redacted> + 36
55 Foundation 0x0000000182fa8510 <redacted> + 16
56 Foundation 0x0000000182efa900 <redacted> + 96
57 Foundation 0x0000000182eeaed8 <redacted> + 604
58 Foundation 0x0000000182faa904 <redacted> + 224
59 libdispatch.dylib 0x00000001001c5a3c _dispatch_client_callout + 16
60 libdispatch.dylib 0x00000001001d2554 _dispatch_queue_drain + 1036
61 libdispatch.dylib 0x00000001001c972c _dispatch_queue_invoke + 464
62 libdispatch.dylib 0x00000001001d466c _dispatch_root_queue_drain + 760
63 libdispatch.dylib 0x00000001001d4364 _dispatch_worker_thread3 + 132
64 libsystem_pthread.dylib 0x0000000182251470 _pthread_wqthread + 1092
65 libsystem_pthread.dylib 0x0000000182251020 start_wqthread + 4
)
2016-04-10 15:58:06.708 coco8[795:360387] This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
Stack:(
0 CoreFoundation 0x00000001825eee50 <redacted> + 148
1 libobjc.A.dylib 0x0000000181c53f80 objc_exception_throw + 56
2 CoreFoundation 0x00000001825eed80 <redacted> + 0
3 Foundation 0x000000018309fafc <redacted> + 88
4 Foundation 0x0000000182f20ccc <redacted> + 36
5 UIKit 0x0000000187fcb810 <redacted> + 992
6 UIKit 0x0000000187fccd38 <redacted> + 788
7 UIKit 0x0000000187fcc96c <redacted> + 296
8 UIKit 0x000000018809c3b8 <redacted> + 480
9 UIKit 0x0000000188099380 <redacted> + 172
10 UIKit 0x00000001880995f0 <redacted> + 96
11 UIKit 0x0000000188099ab4 <redacted> + 80
12 UIKit 0x000000018809e080 <redacted> + 492
13 UIKit 0x000000018809d1ec <redacted> + 148
14 UIKit 0x000000018809d12c <redacted> + 284
15 UIKit 0x0000000187badf90 <redacted> + 444
16 UIKit 0x0000000187bae064 <redacted> + 60
17 UIKit 0x0000000187bae1a4 <redacted> + 28
18 UIKit 0x0000000187bad754 <redacted> + 100
19 UIKit 0x0000000187738b40 <redacted> + 996
20 UIKit 0x0000000187738744 <redacted> + 28
21 UIKit 0x0000000187ac0138 <redacted> + 108
22 UIKit 0x0000000187ab92c8 <redacted> + 1328
23 UIKit 0x0000000187abad64 <redacted> + 4644
24 UIKit 0x0000000187abd7a0 <redacted> + 472
25 UIKit 0x00000001878332b4 <redacted> + 184
26 UIKit 0x000000018808a5c4 <redacted> + 512
27 UIKit 0x0000000188088b78 <redacted> + 228
28 UIKit 0x0000000187bbe534 <redacted> + 260
29 coco8 0x00000001000e20a8 ffi_call_SYSV + 100
30 coco8 0x00000001000e0738 ffi_call + 176
31 coco8 0x0000000100096e5c jsCocoaObject_getProperty + 4624
32 JavaScriptCore 0x000000018603eb5c <redacted> + 324
33 JavaScriptCore 0x0000000185ca693c <redacted> + 1248
34 JavaScriptCore 0x00000001860ea7c0 <redacted> + 9936
35 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
36 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
37 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
38 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
39 JavaScriptCore 0x00000001860edf14 <redacted> + 24100
40 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
41 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
42 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
43 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
44 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
45 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
46 JavaScriptCore 0x00000001860e7ed8 <redacted> + 312
47 JavaScriptCore 0x00000001860139fc <redacted> + 180
48 JavaScriptCore 0x0000000185cb266c <redacted> + 400
49 JavaScriptCore 0x0000000185cb241c JSObjectCallAsFunction + 520
50 coco8 0x00000001000c26b8 +[BurksPool callSelector:ofInstance:writeContext:withArguments:] + 1328
51 coco8 0x00000001000c0f0c -[BurksPool v_id:id:id:] + 128
52 CFNetwork 0x0000000182cfdbac <redacted> + 36
53 Foundation 0x0000000182fa8510 <redacted> + 16
54 Foundation 0x0000000182efa900 <redacted> + 96
55 Foundation 0x0000000182eeaed8 <redacted> + 604
56 Foundation 0x0000000182faa904 <redacted> + 224
57 libdispatch.dylib 0x00000001001c5a3c _dispatch_client_callout + 16
58 libdispatch.dylib 0x00000001001d2554 _dispatch_queue_drain + 1036
59 libdispatch.dylib 0x00000001001c972c _dispatch_queue_invoke + 464
60 libdispatch.dylib 0x00000001001d466c _dispatch_root_queue_drain + 760
61 libdispatch.dylib 0x00000001001d4364 _dispatch_worker_thread3 + 132
62 libsystem_pthread.dylib 0x0000000182251470 _pthread_wqthread + 1092
63 libsystem_pthread.dylib 0x0000000182251020 start_wqthread + 4
)
2016-04-10 15:58:06.719 coco8[795:360387] This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
Stack:(
0 CoreFoundation 0x00000001825eee50 <redacted> + 148
1 libobjc.A.dylib 0x0000000181c53f80 objc_exception_throw + 56
2 CoreFoundation 0x00000001825eed80 <redacted> + 0
3 Foundation 0x000000018309fafc <redacted> + 88
4 Foundation 0x000000018309f9c0 <redacted> + 56
5 Foundation 0x0000000182f251ec <redacted> + 56
6 Foundation 0x0000000182f20dac <redacted> + 260
7 UIKit 0x0000000187fcb810 <redacted> + 992
8 UIKit 0x0000000187fccd38 <redacted> + 788
9 UIKit 0x0000000187fcc96c <redacted> + 296
10 UIKit 0x000000018809c3b8 <redacted> + 480
11 UIKit 0x0000000188099380 <redacted> + 172
12 UIKit 0x00000001880995f0 <redacted> + 96
13 UIKit 0x0000000188099ab4 <redacted> + 80
14 UIKit 0x000000018809e080 <redacted> + 492
15 UIKit 0x000000018809d1ec <redacted> + 148
16 UIKit 0x000000018809d12c <redacted> + 284
17 UIKit 0x0000000187badf90 <redacted> + 444
18 UIKit 0x0000000187bae064 <redacted> + 60
19 UIKit 0x0000000187bae1a4 <redacted> + 28
20 UIKit 0x0000000187bad754 <redacted> + 100
21 UIKit 0x0000000187738b40 <redacted> + 996
22 UIKit 0x0000000187738744 <redacted> + 28
23 UIKit 0x0000000187ac0138 <redacted> + 108
24 UIKit 0x0000000187ab92c8 <redacted> + 1328
25 UIKit 0x0000000187abad64 <redacted> + 4644
26 UIKit 0x0000000187abd7a0 <redacted> + 472
27 UIKit 0x00000001878332b4 <redacted> + 184
28 UIKit 0x000000018808a5c4 <redacted> + 512
29 UIKit 0x0000000188088b78 <redacted> + 228
30 UIKit 0x0000000187bbe534 <redacted> + 260
31 coco8 0x00000001000e20a8 ffi_call_SYSV + 100
32 coco8 0x00000001000e0738 ffi_call + 176
33 coco8 0x0000000100096e5c jsCocoaObject_getProperty + 4624
34 JavaScriptCore 0x000000018603eb5c <redacted> + 324
35 JavaScriptCore 0x0000000185ca693c <redacted> + 1248
36 JavaScriptCore 0x00000001860ea7c0 <redacted> + 9936
37 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
38 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
39 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
40 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
41 JavaScriptCore 0x00000001860edf14 <redacted> + 24100
42 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
43 JavaScriptCore 0x00000001860edce0 <redacted> + 23536
44 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
45 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
46 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
47 JavaScriptCore 0x00000001860edd44 <redacted> + 23636
48 JavaScriptCore 0x00000001860e7ed8 <redacted> + 312
49 JavaScriptCore 0x00000001860139fc <redacted> + 180
50 JavaScriptCore 0x0000000185cb266c <redacted> + 400
51 JavaScriptCore 0x0000000185cb241c JSObjectCallAsFunction + 520
52 coco8 0x00000001000c26b8 +[BurksPool callSelector:ofInstance:writeContext:withArguments:] + 1328
53 coco8 0x00000001000c0f0c -[BurksPool v_id:id:id:] + 128
54 CFNetwork 0x0000000182cfdbac <redacted> + 36
55 Foundation 0x0000000182fa8510 <redacted> + 16
56 Foundation 0x0000000182efa900 <redacted> + 96
57 Foundation 0x0000000182eeaed8 <redacted> + 604
58 Foundation 0x0000000182faa904 <redacted> + 224
59 libdispatch.dylib 0x00000001001c5a3c _dispatch_client_callout + 16
60 libdispatch.dylib 0x00000001001d2554 _dispatch_queue_drain + 1036
61 libdispatch.dylib 0x00000001001c972c _dispatch_queue_invoke + 464
62 libdispatch.dylib 0x00000001001d466c _dispatch_root_queue_drain + 760
63 libdispatch.dylib 0x00000001001d4364 _dispatch_worker_thread3 + 132
64 libsystem_pthread.dylib 0x0000000182251470 _pthread_wqthread + 1092
65 libsystem_pthread.dylib 0x0000000182251020 start_wqthread + 4
)