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when __NSDictionaryM dealloc crash

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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


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