我遇到以下崩溃，但不知道它是什么或从哪里开始查找
这只发生在 5.0 模拟器中。不在 6.0 或 5.1.1 模拟器上
任何帮助表示赞赏。
* thread #6: tid = 0x2903, 0x052fe95e libdispatch.dylib`_dispatch_retain + 4, stop reason = EXC_BAD_ACCESS (code=2, address=0x8)
frame #0: 0x052fe95e libdispatch.dylib`_dispatch_retain + 4
frame #1: 0x052fec26 libdispatch.dylib`dispatch_source_cancel + 18
frame #2: 0x0082c492 CFNetwork`_CFURLCacheDeallocate(void const*) + 64
frame #3: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #4: 0x007c11b1 CFNetwork`HTTPProtocol::~HTTPProtocol() + 459
frame #5: 0x0079a75d CFNetwork`CFClass::FinalizeObj(void const*) + 21
frame #6: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #7: 0x02941af0 CoreFoundation`__CFDictionaryStandardReleaseValue + 80
frame #8: 0x028a24b1 CoreFoundation`__CFBasicHashDrain + 241
frame #9: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #10: 0x007b2237 CFNetwork`SocketStream::~SocketStream() + 477
frame #11: 0x0079a75d CFNetwork`CFClass::FinalizeObj(void const*) + 21
frame #12: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #13: 0x007b1e0b CFNetwork`SocketStream::finalize(void const*) + 63
frame #14: 0x007b1dc6 CFNetwork`non-virtual thunk to SocketStream::finalize(void const*) + 29
frame #15: 0x007b1da1 CFNetwork`ReadStreamCallbacks::_finalize(__CFReadStream*, void*) + 37
frame #16: 0x028b301a CoreFoundation`__CFStreamDeallocate + 138
frame #17: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #18: 0x007bea6c CFNetwork`HTTPReadFilter::~HTTPReadFilter() + 128
frame #19: 0x0079a75d CFNetwork`CFClass::FinalizeObj(void const*) + 21
frame #20: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #21: 0x008502bc CFNetwork`non-virtual thunk to HTTPReadFilter::readStreamFinalize(__CFReadStream*) + 20
frame #22: 0x007bdf1c CFNetwork`CFNetworkReadStream::httpStreamFinalize(__CFReadStream*, void*) + 24
frame #23: 0x028b301a CoreFoundation`__CFStreamDeallocate + 138
frame #24: 0x0288b4e3 CoreFoundation`CFRelease + 291
frame #25: 0x007be70f CFNetwork`NetConnection::shutdownConnectionStreams() + 143
frame #26: 0x0084d1fc CFNetwork`NetConnection::closeStreamsIfPossibleOrSignalThatThatNeedsToBeDonePrettyPlease() + 42
frame #27: 0x007c285b CFNetwork`HTTPConnectionCacheEntry::removeUnauthConnection(__CFNetConnection*) + 179
frame #28: 0x00864d2d CFNetwork`HTTPConnectionCacheEntry::purgeIdleConnections(double) + 237
frame #29: 0x00861c1e CFNetwork`ConnectionCacheTLS::resetCacheForThisThread() + 120
frame #30: 0x007a9739 CFNetwork`ConnectionTimerTLS::_timerPurgeEntries(__CFRunLoopTimer*, void*) + 49
frame #31: 0x02953966 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
frame #32: 0x02953407 CoreFoundation`__CFRunLoopDoTimer + 551
frame #33: 0x028b67c0 CoreFoundation`__CFRunLoopRun + 1888
frame #34: 0x028b5db4 CoreFoundation`CFRunLoopRunSpecific + 212
frame #35: 0x028b5ccb CoreFoundation`CFRunLoopRunInMode + 123
frame #36: 0x00541e40 Foundation`+[NSURLConnection(Loader) _resourceLoadLoop:] + 398
frame #37: 0x004534e6 Foundation`-[NSThread main] + 76
frame #38: 0x00453457 Foundation`__NSThread__main__ + 1258
frame #39: 0x9176bed9 libsystem_c.dylib`_pthread_start + 335
#0 0x052bc95e in _dispatch_retain ()
#1 0x052bcc26 in dispatch_source_cancel ()
#2 0x018f1492 in _CFURLCacheDeallocate ()
#3 0x028494e3 in CFRelease ()
#4 0x018861b1 in HTTPProtocol::~HTTPProtocol ()
#5 0x0185f75d in CFClass::FinalizeObj ()
#6 0x028494e3 in CFRelease ()
#7 0x028ffaf0 in __CFDictionaryStandardReleaseValue ()
#8 0x028604b1 in __CFBasicHashDrain ()
#9 0x028494e3 in CFRelease ()
#10 0x01877237 in SocketStream::~SocketStream ()
#11 0x0185f75d in CFClass::FinalizeObj ()
#12 0x028494e3 in CFRelease ()
#13 0x01876e0b in SocketStream::finalize ()
#14 0x01876dc6 in virtual thunk to SocketStream::finalize(void const*) ()
#15 0x01876da1 in ReadStreamCallbacks::_finalize ()
#16 0x0287101a in __CFStreamDeallocate ()
#17 0x028494e3 in CFRelease ()
#18 0x01883a6c in HTTPReadFilter::~HTTPReadFilter ()
#19 0x0185f75d in CFClass::FinalizeObj ()
#20 0x028494e3 in CFRelease ()
#21 0x019152bc in non-virtual thunk to HTTPReadFilter::readStreamFinalize(__CFReadStream*) ()
#22 0x01882f1c in CFNetworkReadStream::httpStreamFinalize ()
#23 0x0287101a in __CFStreamDeallocate ()
#24 0x028494e3 in CFRelease ()
#25 0x0188370f in NetConnection::shutdownConnectionStreams ()
#26 0x019121fc in NetConnection::closeStreamsIfPossibleOrSignalThatThatNeedsToBeDonePrettyPlease ()
#27 0x0188785b in HTTPConnectionCacheEntry::removeUnauthConnection ()
#28 0x01929d2d in HTTPConnectionCacheEntry::purgeIdleConnections ()
#29 0x01926c1e in ConnectionCacheTLS::resetCacheForThisThread ()
#30 0x0186e739 in ConnectionTimerTLS::_timerPurgeEntries ()
#31 0x02911966 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ ()
#32 0x02911407 in __CFRunLoopDoTimer ()
#33 0x028747c0 in __CFRunLoopRun ()
#34 0x02873db4 in CFRunLoopRunSpecific ()
#35 0x02873ccb in CFRunLoopRunInMode ()
#36 0x035f6f90 in WebCore::runLoaderThread ()