For a crash in my application, NSDictionary is an attribute of the model, and when the model executes the cxx_destruct function, crash occurs inside the NSDictionary.There's a place in the crash stack that I'm not sure about cow_cleanup, what's going on in this function?And The reason for the crash is that during the model release process, NSDictionary changed, right?Here is the concrete Crash stackThread 0 Crashed:
0 libobjc.A.dylib objc_release + 16
1 CoreFoundation cow_cleanup + 168
2 CoreFoundation -[__NSDictionaryM dealloc] + 144
3 imeituan -[CKContent .cxx_destruct] (CKContent.m:12)
4 libobjc.A.dylib object_cxxDestructFromClass(objc_object*, objc_class*) + 112
5 libobjc.A.dylib objc_destructInstance + 88
6 libobjc.A.dylib _objc_rootDealloc + 52
7 imeituan -[CKTableViewCell .cxx_destruct](CKTableViewCell.m:44)
8 libobjc.A.dylib object_cxxDestructFromClass(objc_object*, objc_class*) + 112
9 libobjc.A.dylib objc_destructInstance + 88
10 libobjc.A.dylib _objc_rootDealloc + 52
11 UIKitCore -[UIResponder dealloc] + 152
12 UIKitCore -[UIView dealloc] + 872
13 UIKitCore -[UITableViewCell dealloc] + 236
14 imeituan -[CKBubbleCell dealloc] (CKBubbleCell.m:222)
15 CoreFoundation -[__NSArrayM dealloc] + 228
16 UIKitCore -[UITableView .cxx_destruct] + 1524
17 libobjc.A.dylib object_cxxDestructFromClass(objc_object*, objc_class*) + 112
18 libobjc.A.dylib objc_destructInstance + 88
19 libobjc.A.dylib _objc_rootDealloc + 52
20 UIKitCore -[UIResponder dealloc] + 152
21 UIKitCore -[UIView dealloc] + 872
22 UIKitCore -[UIScrollView dealloc] + 852
23 UIKitCore -[UITableView dealloc] + 364
24 UIKitCore __destroy_helper_block_e8_32s40s + 24
25 libsystem_blocks.dylib _Block_release + 148
26 Foundation -[_NSTimerBlockTarget dealloc] + 44
27 Foundation _timerRelease + 64
28 CoreFoundation __CFRunLoopDoTimer + 936
29 CoreFoundation __CFRunLoopDoTimers + 276
30 CoreFoundation __CFRunLoopRun + 1640
31 CoreFoundation CFRunLoopRunSpecific + 424
32 GraphicsServices GSEventRunModal + 160
33 UIKitCore UIApplicationMain + 1932
34 imeituan main (main.m:38)
35 libdyld.dylib start + 4