IOS crasher: CFNetwork HTTPReadFilter:: doPlainRead (StreamReader *, unsigned char *, long, CFStreamError *, unsigned char *)

У меня есть этот crasher, который часто случается в нашем производственном приложении, но мы не можем воспроизвести его. Это произошло только на iOS8, используя SDK iOS8.

HTTPReadFilter::doPlainRead(StreamReader*, unsigned char*, long, CFStreamError*, unsigned char*) inside CFNetwork. Crashed: com.apple.NSURLConnectionLoader EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x00000000

StackTrace:

        libsystem_platform.dylib    
    _platform_memmove + 185

    CFNetwork   
    HTTPReadFilter::doPlainRead(StreamReader*, unsigned char*, long, CFStreamError*, unsigned char*) + 178

    CFNetwork   
    HTTPReadFilter::_streamImpl_Read(unsigned char*, long, CFStreamError*, unsigned char*) + 394

    CFNetwork   
    CoreStreamBase::_streamInterface_Read(unsigned char*, long) + 98

    CFNetwork   
    HTTPNetStreamInfo::_streamImpl_Read(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 306

    CFNetwork   
    CFNetworkReadStream::httpStreamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*, void*) + 44

    CoreFoundation  
    CFReadStreamRead + 328

    CFNetwork   
    HTTPNetStreamInfo::_readStreamClientCallBack(__CFReadStream*, unsigned long) + 128

    CFNetwork   
    CFNetworkReadStream::_readStreamClientCallBackCallBack(__CFReadStream*, unsigned long, void*) + 38

    CoreFoundation  
    _signalEventSync + 146

    CoreFoundation  
    _cfstream_shared_signalEventSync + 342
        CoreFoundation  
    __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
        CoreFoundation  
    CFRunLoopRunInMode + 106

    CFNetwork   
    +[NSURLConnection(Loader) _resourceLoadLoop:] + 486
        Foundation  
    __NSThread__main__ + 1118
        libsystem_pthread.dylib 
    _pthread_start + 118

Любая помощь очень ценится!