ios - NSURLConnectionLoader 线程中的奇怪崩溃

Question

我们开始看到应用启动时发生的崩溃。 我无法重现它，它只发生在少数用户身上。

异常是:异常类型:EXC_BAD_ACCESS 代码:KERN_INVALID_ADDRESS at 0x3250974659

崩溃发生在名为 com.apple.NSURLConnectionLoader 的线程中 当调用 -[NSBlockOperation main]

这是该线程的堆栈跟踪:

0    libobjc.A.dylib     objc_msgSend + 9
1    Foundation      -[NSBlockOperation main] + 200
2    Foundation  -[__NSOperationInternal start] + 840
3    Foundation  -[_NSCFURLProtocolBridgeWithTrampoline processEventQ] + 344
4    Foundation  -[_NSCFURLProtocolBridgeWithTrampoline pushEvent:from:] + 298
5    Foundation  -[_NSCFURLProtocolBridge stop] + 88
6    Foundation  _bridger + 64
7    CFNetwork   __block_global_7 + 24
8    CFNetwork   __block_global_8 + 12
9    CFNetwork   ___performAsync_block_invoke_068 + 18
10   CoreFoundation  CFArrayApplyFunction + 176
11   CFNetwork   RunloopBlockContext::perform() + 74
12   CFNetwork   MultiplexerSource::perform() + 188
13   CoreFoundation  __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
14   CoreFoundation  __CFRunLoopDoSources0 + 212
15   CoreFoundation  __CFRunLoopRun + 646
16   CoreFoundation  CFRunLoopRunSpecific + 356
17   CoreFoundation  CFRunLoopRunInMode + 104
18   Foundation  +[NSURLConnection(Loader) _resourceLoadLoop:] + 308
19   Foundation  __NSThread__main__ + 972
20   libsystem_c.dylib   _pthread_start + 308

如果能帮助您了解是什么导致了这种崩溃，我们将不胜感激。

Answer 1

对我而言，这段代码间接导致了崩溃。如果我正确阅读故障转储

[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]

正在触发 NSURLConnectionLoaderThread。这可能是他们用于异步支持的内容。但是当我使用同步请求时，我无法在线程运行时释放对象。如果你问我，那是 IOS 7 中的一个错误。

NSMutableURLRequest* request = [self setupRequestWithService:service andMethod:operation];

    [request addValue:CONTENT_TYPE_APPLICATION_JSON forHTTPHeaderField:REQUEST_HEADER_CONTENT_TYPE];
    [request setHTTPMethod:@"POST"];

    NSError* error = nil;
    NSData* jsonData = nil;

    NSAssert(message,@"Message must not be null");

    jsonData = [NSJSONSerialization dataWithJSONObject:[message toDictionary] options:kNilOptions error:&error];

    NSAssert(! error, @"Message could not be json serialized");

    Log(@"----------------------------------------------------------------------");
    Log(@"JSON DATA: - %@", [[NSString alloc] initWithData:jsonData
                                                     encoding:NSUTF8StringEncoding]);
    Log(@"----------------------------------------------------------------------");

    [request setHTTPBody:jsonData];

    // Send Synchronous Request
    NSURLResponse *response = nil;
    error = nil;
    NSData* responseData = nil;
    NSString* responseString = nil;

    responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];