libobjc.A.dylib objc_msgSend崩溃是在后台线程中使用核心数据发生的
libobjc.A.dylib objc_msgSend崩溃是在后台线程中使用核心数据发生的
提问于 2016-08-02 03:29:54
我正在调查应用程序的Crashlytics控制台中经常报告的一次崩溃。
我有许多示例之一，其中有以下崩溃的线程堆栈跟踪：
#11. Crashed: com.apple.root.default-qos
0 libobjc.A.dylib 0x22f3fa86 objc_msgSend + 5
1 Foundation 0x23ee3005 -[NSString caseInsensitiveCompare:] + 28
2 Foundation 0x23ed10bd _NSCompareObject + 28
3 Foundation 0x23ed109d _NSSortFunctionOne + 120
4 CoreFoundation 0x2373e6a3 __CFSimpleMergeSort + 114
5 CoreFoundation 0x2373e6c5 __CFSimpleMergeSort + 148
6 CoreFoundation 0x2373e6d9 __CFSimpleMergeSort + 168
7 CoreFoundation 0x2373e6c5 __CFSimpleMergeSort + 148
8 CoreFoundation 0x2373e6d9 __CFSimpleMergeSort + 168
9 CoreFoundation 0x2368ac35 CFSortIndexes + 404
10 CoreFoundation 0x2368c241 CFMergeSortArray + 176
11 Foundation 0x23ed0a9d _sortedObjectsUsingDescriptors + 456
12 Foundation 0x23f9c9fb -[NSSet(NSKeyValueSorting) sortedArrayUsingDescriptors:] + 510
13 MyApp 0x6d431 __24-[MyApp refresh]_block_invoke (MyApp.m:247)
14 CoreFoundation 0x23769499 __NSArrayEnumerate + 372
15 CoreFoundation 0x236e6c3b -[NSArray enumerateObjectsWithOptions:usingBlock:] + 62
16 MyApp 0x6d17d -[MyApp refresh] (MyApp.m:263)
17 MyApp 0xa97eb __52-[MyAppRequest updateAfterNotification:]_block_invoke (MyAppRequest.m:1175)
18 libdispatch.dylib 0x23307cbf _dispatch_call_block_and_release + 10
19 libdispatch.dylib 0x233136a1 _dispatch_root_queue_drain + 1572
20 libdispatch.dylib 0x2331307b _dispatch_worker_thread3 + 94
21 libsystem_pthread.dylib 0x234a6e0d _pthread_wqthread + 1024
22 libsystem_pthread.dylib 0x234a69fc start_wqthread + 8崩溃的其他实例发生在相同的应用程序代码中(在refresh方法的MyApp类中)，但发生在CoreFoundation sortedArrayUsingDescriptors方法逻辑的不同部分。例如，堆栈跟踪的另一个崩溃示例有：
0 libobjc.A.dylib 0x1823cdb90 objc_msgSend + 16
1 CoreFoundation 0x182c42738 CFStringCompareWithOptionsAndLocale + 232
2 Foundation 0x183644840 _NSCompareObject + 64
3 CoreFoundation 0x182d150f4 __CFSimpleMergeSort + 196
4 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
5 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
6 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
7 CoreFoundation 0x182d1513c __CFSimpleMergeSort + 268
8 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
9 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
10 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
11 CoreFoundation 0x182c3b738 CFSortIndexes + 472
12 CoreFoundation 0x182c3cf58 CFMergeSortArray + 220
13 Foundation 0x1836440f8 _sortedObjectsUsingDescriptors + 564
14 Foundation 0x183725120 -[NSSet(NSKeyValueSorting) sortedArrayUsingDescriptors:] + 564
15 MyApp 0x10006f264 __24-[MyApp refresh]_block_invoke (MyApp.m:247)刷新中的应用程序代码是：
- (void)refresh {
NSArray *products = [self getProducts];
NSMutableArray *validProducts = [NSMutableArray array];
[products enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
Product *prod = obj;
// Convert to internal native format (MyAppProduct) for business reasons...
MyAppProduct *myAppProd = [[MyAppProduct alloc] init];
myAppProd.ID = prod.id;
myAppProd.name = prod.name;
NSArray *subProds = [prod.subProds sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"subProds" ascending:NO]]];
NSMutableArray *validSubProds = [NSMutableArray array];
[subProds enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
SubProd *subProd = obj;
// Convert to internal native format (MyAppSubProduct) for business reasons...
MyAppSubProduct *myAppSubProd = [[MyAppSubProduct alloc] initWithSubProd:subProd];
[validSubProds addObject:myAppSubProd];
}];
myAppProd.subProds = validSubProds;
myAppProd.count = [product.count integerValue];
// Add to array
[validProducts addObject:myAppProd];
}];
// Apply array to self
_products = validProducts
}其中getProducts是：
- (NSArray*)getProducts {
NSFetchRequest *productFetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Products"];
// Filter
NSMutableArray *productsPredicates = [NSMutableArray array];
[productsPredicates addObject:[NSPredicate predicateWithFormat:@"life_uid == %@", req.lifeUid]];
[productsPredicates addObject:[NSPredicate predicateWithFormat:@"hidden == %@", @NO]];
[productFetchRequest setPredicate:[NSCompoundPredicate andPredicateWithSubpredicates:productsPredicates]];
// Sort
NSSortDescriptor *sortProductsByName = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[productFetchRequest setSortDescriptors:@[sortProductsByName]];
[productFetchRequest setReturnsObjectsAsFaults:NO];
[productFetchRequest setRelationshipKeyPathsForPrefetching:@[@"subprods", @"subprods.special"]];
NSManagedObjectContext *moc = [MyAppCoreDataController sharedController].mainManagedObjectContext;
NSError *error = nil;
NSArray *products = [moc executeFetchRequest:productFetchRequest error:&error];
if (error) {
NSLog(@"Error fetching products %@", error);
}
return products;
}refresh是这样调用的：
- (void)updateAfterNotification:(NSNotification *)notification {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[[MyApp instance] refresh];
});
}回答 1
Stack Overflow用户
发布于 2016-08-02 16:29:45
很可能是因为您没有正确地处理核心数据并发性。使用NSPrivateQueueConcurrencyType或NSMainQueueConcurrencyType创建托管对象上下文时，必须将所有的核心数据访问放入对performBlock或performBlockAndWait的调用中。这包括获取以及访问获取对象的属性值。
您正在使用dispatch_async，这不是处理与核心数据并发的正确方法。您应该改用performBlock或performBlockAndWait。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/38711332
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