Hi Jerry. I don't know about the FTP crash, but I believe that the other two crashes are due to a 10.6.3 regression. I've filed <rdar://problem/7816615> "10.6.3 Regression? Reproducible NSURLConnection crash with 301 redirects".
For more information and a sample Xcode project demonstrating the crash, see this ClickToFlash ticket: https://rentzsch.lighthouseapp.com/projects/24342/tickets/615-crash-at-httpwwwpingreehousegovlegisappropriations -Jeff On Apr 19, 2010, at 11:33 PM, Jerry Krinock wrote: > I can find in the list archives for 2005-2007 quite a few mentions of crashes > when using asynchronous NSURLConnection, and in 2005 I myself reported > Problem ID 4347324. The crashes seemed to stop without a definitive > resolution, possibly with Mac OS 10.5, but have reappeared in my apps > recently. A crash is likeliest when the app is rapidly creating, reading the > first packet, cancelling, and releasing NSURLConnections at a rate of 20 per > second, has 10-20 such connections open simultaneously, and may be more > likely on multi-processor/multi-core Mac Pro systems with high-speed network > access. > > So on Wednesday I've scheduled time at an ADC lab to beat on this. Below, > I've pasted in call stacks for the three crash reports I've collected; one > from my testing and two from users. The first two are somewhat similar, > involving +[NSURLConnection(NSURLConnectionReallyInternal) > _resourceLoadLoop:] on a secondary thread. I suppose this is a callback when > data arrives. But the third one is quite different, and is on the main > thread. > > I'd appreciate any suggestions of what to look for, or any better explanation > of what's going on in those call stacks. I know memory management is a > possible issue, although I've been there many times, I'm looking again. > > Thank you, > > Jerry Krinock > > *** Jerry's Crash *** > Thread 7 crashed: > #0 0x92b37120 in CFReadStreamCopyError > #1 0x913af407 in FTPProtocol::ftpReadStreamEvent > #2 0x92afedd3 in _signalEventSync > #3 0x92aff7be in _cfstream_solo_signalEventSync > #4 0x92afea88 in _CFStreamSignalEvent > #5 0x92aff707 in CFReadStreamSignalEvent > #6 0x9136ffcd in _DataStreamCallBack > #7 0x92afedd3 in _signalEventSync > #8 0x92afed58 in _cfstream_shared_signalEventSync > #9 0x92a7515b in __CFRunLoopDoSources0 > #10 0x92a72c1f in __CFRunLoopRun > #11 0x92a720f4 in CFRunLoopRunSpecific > #12 0x92a71f21 in CFRunLoopRunInMode > #13 0x93dc6434 in +[NSURLConnection(NSURLConnectionReallyInternal) > _resourceLoadLoop:] > #14 0x93d8d8dc in -[NSThread main] > #15 0x93d8d88c in __NSThread__main__ > #16 0x914c2a19 in _pthread_start > #17 0x914c289e in thread_start > > > *** Jon's Crash *** > Thread 3 Crashed: > 0 com.apple.CoreFoundation 0x91a2926e CFHash + 174 > 1 com.apple.CoreFoundation 0x91a2906c ___CFBasicHashFindBucket1 + > 444 > 2 com.apple.CoreFoundation 0x91a3125c CFBasicHashFindBucket + 252 > 3 com.apple.CoreFoundation 0x91a31123 CFDictionaryGetValue + 131 > 4 com.apple.CoreFoundation 0x91b17a95 _CFStreamDetachSource + 405 > 5 com.apple.CoreFoundation 0x91a4edeb _CFStreamClose + 75 > 6 com.apple.CFNetwork 0x97fec8e1 > HTTPProtocol::destroyReadStream() + 173 > 7 com.apple.CFNetwork 0x97fec7b1 > HTTPProtocol::cleanupStreams() + 93 > 8 com.apple.CFNetwork 0x97feb221 > HTTPProtocol::httpReadStreamEvent(unsigned long) + 365 > 9 com.apple.CoreFoundation 0x91adfdd3 _signalEventSync + 99 > 10 com.apple.CoreFoundation 0x91adfd58 > _cfstream_shared_signalEventSync + 664 > 11 com.apple.CoreFoundation 0x91a5615b __CFRunLoopDoSources0 + 1563 > 12 com.apple.CoreFoundation 0x91a53c1f __CFRunLoopRun + 1071 > 13 com.apple.CoreFoundation 0x91a530f4 CFRunLoopRunSpecific + 452 > 14 com.apple.CoreFoundation 0x91a52f21 CFRunLoopRunInMode + 97 > 15 com.apple.Foundation 0x9689d434 > +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 329 > 16 com.apple.Foundation 0x968648dc -[NSThread main] + 45 > 17 com.apple.Foundation 0x9686488c __NSThread__main__ + 1499 > 18 libSystem.B.dylib 0x90567a19 _pthread_start + 345 > 19 libSystem.B.dylib 0x9056789e thread_start + 34 > > *** Tony's Crash *** > Thread 0 Crashed: Dispatch queue: com.apple.main-thread > 0 com.apple.CoreFoundation 0x99138d04 CFRelease + 196 > 1 com.apple.CFNetwork 0x905e58ec > HTTPProtocol::destroyReadStream() + 184 > 2 com.apple.CFNetwork 0x905e57b1 > HTTPProtocol::cleanupStreams() + 93 > 3 com.apple.CFNetwork 0x905e5acb > HTTPProtocol::~HTTPProtocol() + 155 > 4 com.apple.CoreFoundation 0x99138ea1 _CFRelease + 353 > 5 com.apple.CFNetwork 0x905e554c > URLConnectionLoader::reallyCleanUpProtocol(unsigned char) + 240 > 6 com.apple.CFNetwork 0x90640249 > URLConnectionLoader::cleanupProtocolFromClientThread() + 25 > 7 com.apple.CFNetwork 0x905bb2c8 > URLConnectionClient::getRequestForTransmission(_CFURLResponse*, _CFURLRequest > const*, __CFError**) + 574 > 8 com.apple.CFNetwork 0x905bacaf > URLConnectionClient::_clientWillSendRequest(_CFURLRequest const*, > _CFURLResponse*, URLConnectionClient::ClientConnectionEventQueue*) + 223 > 9 com.apple.CFNetwork 0x9063f54a > URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, > XClientEventParams>*, long) + 148 > 10 com.apple.CFNetwork 0x905baace > URLConnectionClient::processEvents() + 94 > 11 com.apple.CFNetwork 0x905ba96f MultiplexerSource::perform() > + 183 > 12 com.apple.CoreFoundation 0x9916b15b __CFRunLoopDoSources0 + 1563 > 13 com.apple.CoreFoundation 0x99168c1f __CFRunLoopRun + 1071 > 14 com.apple.CoreFoundation 0x991680f4 CFRunLoopRunSpecific + 452 > 15 com.apple.CoreFoundation 0x99167f21 CFRunLoopRunInMode + 97 > 16 com.apple.HIToolbox 0x9827b0fc RunCurrentEventLoopInMode + > 392 > 17 com.apple.HIToolbox 0x9827aeb1 ReceiveNextEventCommon + 354 > 18 com.apple.HIToolbox 0x9827ad36 > BlockUntilNextEventMatchingListInMode + 81 > 19 com.apple.AppKit 0x979ae135 _DPSNextEvent + 847 > 20 com.apple.AppKit 0x979ad976 -[NSApplication > nextEventMatchingMask:untilDate:inMode:dequeue:] + 156 > 21 com.apple.AppKit 0x9796fbef -[NSApplication run] + 821 > 22 com.apple.AppKit 0x97967c85 NSApplicationMain + 574 _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. 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