Crash in our app [iOS]

We are using lightstreamer os x client in our project. Recently, we saw some crash related to NSURLConnection. However, we dont use this class in our code so we doubt this could be a issue caused by Lightstreamer. The version we currently use is pretty old and not sure if this is a fixed issue or not. Our testing environment is OS X 10.10.

Code:

Crashed Thread: 3 com.apple.NSURLConnectionLoader Exception Type: EXC_GUARD Exception Codes: 0x400000010000003f, 0x00007ffbd7fa58e0Thread 3 Crashed:: com.apple.NSURLConnectionLoader 0 libsystem_kernel.dylib 0x00007fff91c6fba2 close + 10 1 com.apple.security 0x00007fff920f9e0e Security::AtomicBufferedFile::~AtomicBufferedFile() + 22 2 com.apple.security 0x00007fff921f6da6 Security::RefPointer<Security::AtomicBufferedFile>::release_internal() + 66 3 com.apple.security 0x00007fff920f7c2c Security::RefPointer<Security::AtomicBufferedFile>::release() + 30 4 com.apple.security 0x00007fff921f6d2f Security::RefPointer<Security::AtomicBufferedFile>::~RefPointer() + 15 5 com.apple.security 0x00007fff920f5ad1 Security::DbModifier::getDbVersion(bool) + 437 6 com.apple.security 0x00007fff920f58fd Security::DbModifier::openDatabase() + 55 7 com.apple.security 0x00007fff920f55d9 Security::Database::_dbOpen(Security::DatabaseSession&, unsigned int, Security::AccessCredentials const*, void const*) + 85 8 com.apple.security 0x00007fff920f4ec5 Security::DatabaseManager::dbOpen(Security::DatabaseSession&, Security::DbName const&, unsigned int, Security::AccessCredentials const*, void const*) + 67 9 com.apple.security 0x00007fff920f4b88 Security::DatabaseSession::DbOpen(char const*, cssm_net_address const*, unsigned int, Security::AccessCredentials const*, void const*, long&) + 156 10 com.apple.security 0x00007fff92103f5a cssm_DbOpen(long, char const*, cssm_net_address const*, unsigned int, cssm_access_credentials const*, void const*, long*) + 219 11 com.apple.security 0x00007fff92103c9f CSSM_DL_DbOpen + 111 12 com.apple.security 0x00007fff92102f6e Security::CssmClient::DbImpl::open() + 212 13 com.apple.security 0x00007fff92104355 SSDatabaseImpl::open(Security::DLDbIdentifier const&) + 59 14 com.apple.security 0x00007fff921040a1 SSDLSession::DbOpen(char const*, cssm_net_address const*, unsigned int, Security::AccessCredentials const*, void const*, long&) + 245 15 com.apple.security 0x00007fff92103f5a cssm_DbOpen(long, char const*, cssm_net_address const*, unsigned int, cssm_access_credentials const*, void const*, long*) + 219 16 com.apple.security 0x00007fff92103c9f CSSM_DL_DbOpen + 111 17 com.apple.security 0x00007fff92102f6e Security::CssmClient::DbImpl::open() + 212 18 com.apple.security 0x00007fff9210c05b Security::KeychainCore::KCCursorImpl::next(Security::KeychainCore::Item&) + 577 19 com.apple.security 0x00007fff9213c8cb SecIdentityCopyPreference + 724 20 com.apple.CFNetwork 0x00007fff8ff1e037 HTTPProtocolSSLSupport::getSSLCertsCached(__CFString const*) + 237 21 com.apple.CFNetwork 0x00007fff8ff1db84 HTTPProtocol::copyProtocolPropertiesForStream() + 608 22 com.apple.CFNetwork 0x00007fff8ff2f3fb HTTPProtocol::setProtocolPropertiesToStream() + 19 23 com.apple.CFNetwork 0x00007fff8ff2f1d8 HTTPProtocol::openStream() + 42 24 com.apple.CFNetwork 0x00007fff8ff2e3bd HTTPProtocol::useNetStreamInfoForRequest(MetaNetStreamInfo*, HTTPRequestMessage const*, unsigned char) + 1607 25 com.apple.CFNetwork 0x00007fff8ff2db39 HTTPConnectionCacheEntry::dispatchConnectionToProtocol(HTTPNetConnection*, HTTPConnectionCacheEnqueuedRequestInfo*, unsigned char) + 265 26 com.apple.CFNetwork 0x00007fff8ff2be31 HTTPConnectionCacheEntry::ingestTube(Tube*) + 1189 27 com.apple.CFNetwork 0x00007fff8ff2b618 HTTPConnectionCache::_onqueue_ingestTube(Tube*) + 120 28 com.apple.CFNetwork 0x00007fff8ff2ae47 TubeManager::_onqueue_newTubeReady(Tube*, __CFError*) + 493 29 com.apple.CFNetwork 0x00007fff8ff2ac30 ___ZN11TubeManager12newTubeReadyEP4TubeP9__CFError_block_invoke + 30 30 com.apple.CFNetwork 0x00007fff8ff14cec RunloopBlockContext::_invoke_block(void const*, void*) + 72 31 com.apple.CoreFoundation 0x00007fff92787664 CFArrayApplyFunction + 68 32 com.apple.CFNetwork 0x00007fff8ff14bad RunloopBlockContext::perform() + 133 33 com.apple.CFNetwork 0x00007fff8ff14998 MultiplexerSource::perform() + 282 34 com.apple.CFNetwork 0x00007fff8ff147ba MultiplexerSource::_perform(void*) + 72 35 com.apple.CoreFoundation 0x00007fff927bba01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 36 com.apple.CoreFoundation 0x00007fff927adb8d __CFRunLoopDoSources0 + 269 37 com.apple.CoreFoundation 0x00007fff927ad1bf __CFRunLoopRun + 927 38 com.apple.CoreFoundation 0x00007fff927acbd8 CFRunLoopRunSpecific + 296 39 com.apple.CFNetwork 0x00007fff8ff07220 +[NSURLConnection(Loader) _resourceLoadLoop:] + 434 40 com.apple.Foundation 0x00007fff88b99dc2 __NSThread__main__ + 1345 41 libsystem_pthread.dylib 0x00007fff8f47b268 _pthread_body + 131 42 libsystem_pthread.dylib 0x00007fff8f47b1e5 _pthread_start + 176 43 libsystem_pthread.dylib 0x00007fff8f47941d thread_start + 13

Hello,

it doesn't look like one of our threads: there are no references to our library in the stack, this "Loader" category of NSURLConnection is something we don't use (it's not even part of public APIs), and its name ("com.apple.NSURLConnectionLoader") is unknown to us.

Our OS X client library, starting with 1.0.0, runs all NSURLConnection operations inside threads with a name like "LS URL Dispatcher Thread <number>". It looks more like a system background thread spawned by some other operation.

On StackOverflow there's a good answer about EXC_GUARD that can provide some hints.
I'm afraid we can't be of more help.
Best regards,

Gianluca

I see. Thank you for your information.

Quick update. I upgrade the Lightstreamer client and the crash seems be fixed.