iOS:从 Crashlytics 了解 SIGABRT 崩溃

Question

所以我收到了我的 iOS 应用程序的 Crashlytics 崩溃报告。对于一些用户，应用程序一直在崩溃，在崩溃日志中给出 SIGABRT。

无数小时以来，我一直试图找出此错误的原因，但由于错误的发生率(大约 1-2% 的用户)，我一直无法重现该错误，而且由于来自 Crashlytics 的信息量有限，我一直找不到这个错误的根本原因。

该应用程序的部署目标是 iOS 7，并且装有 iOS 10+ 的各种尺寸的设备都遇到了崩溃(我不确定 iOS 9、8 或 7 是否也遇到了错误——Crashlytics 仅显示 iOS 上的崩溃10+)

这是堆栈跟踪:

CRASH_INFO_ENTRY_1
*** error for object 0x17127f4c0: Invalid pointer dequeued from free list
CRASH_INFO_ENTRY_0
abort() called

Crashed: com.apple.main-thread
SIGABRT ABORT 0x000000018e2ea014

#0. Crashed: com.apple.main-thread
0  libsystem_kernel.dylib         0x18f6ca014 __pthread_kill + 8
1  libsystem_pthread.dylib        0x18f791460 pthread_kill + 112
2  libsystem_c.dylib              0x18f63e3f4 abort + 140
3  libsystem_malloc.dylib         0x18f70ea38 
_nano_vet_and_size_of_live + 330
4  libsystem_malloc.dylib         0x18f710bf0 
_nano_malloc_check_clear + 392
5  libsystem_malloc.dylib         0x18f70fbb4 nano_calloc + 80
6  libsystem_malloc.dylib         0x18f701180 malloc_zone_calloc + 152
7  libsystem_malloc.dylib         0x18f7010c4 calloc + 40
8  libobjc.A.dylib                0x18f131cfc cache_t::reallocate(unsigned int, unsigned int) + 52
9  libobjc.A.dylib                0x18f1321fc cache_fill + 216
10 libobjc.A.dylib                0x18f13cd00 lookUpImpOrForward + 412
11 libobjc.A.dylib                0x18f147258 _objc_msgSend_uncached + 56
12 UIKit                          0x1967274e8 -[UITableView _endCellAnimationsWithContext:] + 13964
13 Champion                       0x100097bf4 -[MatchdayComposeController controllerDidChangeContent:] (MatchdayComposeController.m:427)
14 CoreData                       0x192abfe28 __82-[NSFetchedResultsController(PrivateMethods) _core_managedObjectContextDidChange:]_block_invoke + 4760
15 CoreData                       0x192abeb80 -[NSFetchedResultsController(PrivateMethods) _core_managedObjectContextDidChange:] + 124
16 CoreFoundation                 0x19069622c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
17 CoreFoundation                 0x190695930 _CFXRegistrationPost + 400
18 CoreFoundation                 0x1906956ac ___CFXNotificationPost_block_invoke + 60
19 CoreFoundation                 0x190704b9c -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1504
20 CoreFoundation                 0x1905d7bf4 _CFXNotificationPost + 376
21 Foundation                     0x1910de6bc -[NSNotificationCenter postNotificationName:object:userInfo:] + 68
22 CoreData                       0x1929eed1c -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] + 724
23 CoreData                       0x192a75170 -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:deletions:updates:refreshes:deferrals:wasMerge:] + 1336
24 CoreData                       0x1929ed338 -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 2116
25 CoreData                       0x1929ebe3c -[NSManagedObjectContext save:] + 416
26 Champion                       0x10008e2ac -[AppDelegate saveContext] (AppDelegate.m:263)
27 Champion                       0x10009d1d4 +[Globals saveManagedObjectContext] (Globals.m:157)
28 Champion                       0x10006ee4c -[EntitySyncClient saveUpdates:] (EntitySyncClient.m:232)
29 Champion                       0x1000690a0 -[MatchController datepickerDidChangeValue:] (MatchController.m:994)
30 UIKit                          0x1965799a0 -[UIApplication sendAction:to:from:forEvent:] + 96
31 UIKit                          0x196579920 -[UIControl sendAction:to:forEvent:] + 80
32 UIKit                          0x196563dd0 -[UIControl _sendActionsForEvents:withEvent:] + 452
33 UIKit                          0x196e62c44 -[_UIDatePickerView pickerView:didSelectRow:inComponent:] + 540
34 UIKit                          0x1967b965c -[UIPickerView _sendSelectionChangedForComponent:notify:] + 116
35 UIKit                          0x1967b9894 -[UIPickerView _sendSelectionChangedFromTable:notify:] + 344
36 UIKit                          0x196ce6878 -[UIPickerTableView _scrollingFinished] + 188
37 UIKit                          0x196ce6a50 -[UIPickerTableView scrollViewDidEndDecelerating:] + 28
38 UIKit                          0x196857abc -[UIScrollView(UIScrollViewInternal) _scrollViewDidEndDeceleratingForDelegate] + 132
39 UIKit                          0x1966ed2cc -[UIScrollView(UIScrollViewInternal) _stopScrollDecelerationNotify:] + 332
40 UIKit                          0x1966ece08 -[UIScrollView _smoothScrollWithUpdateTime:] + 2356
41 QuartzCore                     0x1938ff640 CA::Display::DisplayLinkItem::dispatch(unsigned long long) + 44
42 QuartzCore                     0x1938ff4ec CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 444
43 IOKit                          0x190968570 IODispatchCalloutFromCFMessage + 372
44 CoreFoundation                 0x19069256c __CFMachPortPerform + 180
45 CoreFoundation                 0x1906aa934 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 56
46 CoreFoundation                 0x1906aa0e8 __CFRunLoopDoSource1 + 436
47 CoreFoundation                 0x1906a7bcc __CFRunLoopRun + 1840
48 CoreFoundation                 0x1905d6048 CFRunLoopRunSpecific + 444
49 GraphicsServices               0x192059198 GSEventRunModal + 180
50 UIKit                          0x1965af818 -[UIApplication _run] + 684
51 UIKit                          0x1965aa550 UIApplicationMain + 208
52 Champion                       0x1000b082c main (main.m:14)
53 libdispatch.dylib              0x18f5b85b8 (Missing)

如有任何帮助，我将不胜感激。如果我能得到任何类型的重现 Crashlytics 错误的指示，我也将不胜感激。

用代码更新问题

在 controllerDidChangeContent: 中，主要是 TableView 正在结束更新。

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView endUpdates];
    if(controller.fetchedObjects.count == 0){
      self.showsNoMatchesHint = YES;
    }
    else{
      self.showsNoMatchesHint = NO;
    }
}

Answer 1

鉴于您的程序的最后一次喘息是在 _endCellAnimationsWithContext 中，并且这些类型的动画通常发生在单元格编辑完成时，我会在该特定表格完成单元格编辑操作时调查问题。那里还有一个选择器 View 和一个通知，所以应该缩小一些范围。祝你好运。