EXC_BREAKPOINT随机使用NSOutputStream

我正在编写一个使用NSOutputStream的应用程序 . 我这样初始化连接：

delegate = self;
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;

CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)url,port, &readStream, &writeStream);
CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);

inputStream = (__bridge_transfer NSInputStream *)readStream;
outputStream = (__bridge_transfer NSOutputStream *)writeStream;

[inputStream setDelegate:delegate];
[outputStream setDelegate:delegate];

loop = [NSRunLoop currentRunLoop];
[inputStream scheduleInRunLoop:loop forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:loop forMode:NSDefaultRunLoopMode];

[inputStream setProperty:NSStreamSocketSecurityLevelTLSv1 forKey:NSStreamSocketSecurityLevelKey];
[outputStream setProperty:NSStreamSocketSecurityLevelTLSv1 forKey:NSStreamSocketSecurityLevelKey];



[inputStream setProperty:NSStreamSocketSecurityLevelNegotiatedSSL
                  forKey:NSStreamSocketSecurityLevelKey];
[outputStream setProperty:NSStreamSocketSecurityLevelNegotiatedSSL
                   forKey:NSStreamSocketSecurityLevelKey];

NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsExpiredCertificates,
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsAnyRoot,
                          [NSNumber numberWithBool:NO], kCFStreamSSLValidatesCertificateChain,
                          kCFNull,kCFStreamSSLPeerName,
                          nil];

CFReadStreamSetProperty((CFReadStreamRef)inputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);
CFWriteStreamSetProperty((CFWriteStreamRef)outputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);

[outputStream open];
[inputStream open];

[self sendVersionOrWait];
[loop run];

然后做一些动作取决于NSStreamDelegate方法 . 闭合连接通过以下方式完成：

[inputStream close];
[outputStream close];
[inputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream setDelegate:nil];
[outputStream setDelegate:nil];

inputStream = nil;
outputStream = nil;

有时（它是随机的）我得到EXC_BREAKPOINT并且应用程序崩溃了 . 这是崩溃日志的一部分：

异常类型：EXC_BREAKPOINT（SIGTRAP）异常代码：0x0000000000000001,0x000000000000defe由线程触发：5

线程5名称：Dispatch queue：com.apple.root.default-qos

线程5崩溃：

0 CoreFoundation 0x22767e22 CFHash 130

1 CoreFoundation 0x22768d70 CFBasicHashGetCountOfKey 1152

2 CoreFoundation 0x227688aa CFSetContainsValue 98

3 CoreFoundation 0x2279ca5a CFRunLoopRemoveSource 226

4 CFNetwork 0x22343eca SocketStream :: write（__ CFWriteStream *，unsigned char const *，long，CFStreamError *）426

5 CFNetwork 0x223480c2 WriteStreamCallbacks :: _ write（__ CFWriteStream *，unsigned char const *，long，CFStreamError *，void *）34

6 CoreFoundation 0x2278d7ec CFWriteStreamWrite 356

7 App 0x000a0190 - [AppMenuViewController sendVersion]（AppMenuViewController.m：763）

8 App 0x000a0c68 - [AppMenuViewController sendVersionOrWait]（AppMenuViewController.m：832）

9基金会0x235655e4 __NSFireDelayedPerform 464

10 CoreFoundation 0x22828734 CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION 12

11 CoreFoundation 0x228282b4 __CFRunLoopDoTimer 652

12 CoreFoundation 0x2282651e __CFRunLoopRun 1414

13 CoreFoundation 0x22773dac CFRunLoopRunSpecific 472

14 CoreFoundation 0x22773bbe CFRunLoopRunInMode 102

15基础0x234ab16c - [NSRunLoop（NSRunLoop）runMode：beforeDate：] 260

16基金会0x234f95e0 - [NSRunLoop（NSRunLoop）运行] 76

17 App 0x0009feaa - [AppMenuViewController initConnection：withPort：]（AppMenuViewController.m：749）

18 App 0x000a1642 - [AppMenuViewController stream：handleEvent：]（AppMenuViewController.m：952）

19 CoreFoundation 0x227d9b94 _signalEventSync 144

20 CoreFoundation 0x227e3ef2 _cfstream_solo_signalEventSync 198

21 CoreFoundation 0x227d981e _CFStreamSignalEvent 322

22 CFNetwork 0x222b7bd4 SocketStream :: dispatchSignalFromSocketCallbackUnlocked（SocketStreamSignalHolder *）36

23 CFNetwork 0x222b78be SocketStream :: socketCallback（__ CFSocket *，unsigned long，__ CFData const *，void const *）146

24 CFNetwork 0x222b77f2 SocketStream :: _ SocketCallBack_stream（__ CFSocket *，unsigned long，__ CFData const *，void const *，void *）54

25 CoreFoundation 0x2282b0bc __CFSocketPerformV0 552

26 CoreFoundation 0x22828804 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION 12

27 CoreFoundation 0x22827c16 __CFRunLoopDoSources0 218

28 CoreFoundation 0x22826294 __CFRunLoopRun 764

29 CoreFoundation 0x22773dac CFRunLoopRunSpecific 472

30 CoreFoundation 0x22773bbe CFRunLoopRunInMode 102

31基金会0x234ab16c - [NSRunLoop（NSRunLoop）runMode：beforeDate：] 260

32基础0x234f95e0 - [NSRunLoop（NSRunLoop）运行] 76

33 App 0x0009feaa - [AppMenuViewController initConnection：withPort：]（AppMenuViewController.m：749）

34 App 0x0009b664 __58- [AppMenuViewController alertView：clickedButtonAtIndex：] _ block_invoke（AppMenuViewController.m：385）

35 libdispatch.dylib 0x30521610 _dispatch_call_block_and_release 8

36 libdispatch.dylib 0x3052d350 _dispatch_root_queue_drain 816

37 libdispatch.dylib 0x3052e27a _dispatch_worker_thread3 102

38 libsystem_pthread.dylib 0x3069ee22 _pthread_wqthread 666

39 libsystem_pthread.dylib 0x3069eb74 start_wqthread 4

I suppose it can be caused by network problems because it appears when my WIFI router doesn't have Internet connection. But I'm not sure and I don't know how to remove this error. Please, help :)