FTP file listing crash (iOS 6.1) - ftp

Question

I have waited for iOS 6.1 hoping that it can solve some network issue I have discovered during the development of my application (with iOS 6.0.x). Actually, the iOS 6.1 resolve some of these issues, but unfortunately other still occurs. I have opened a bug report to Apple, but my customer (a big company) needs to show the application soon and this instability is a severe limitation. :( I ask here hoping that somebody have discovered this problem and found a workaround. Basically I performs some consecutive file listing through a FTP daemon (vsftpd). Randomly, the application crash inside the following selector:
[self.networkStream open];
I have reproduced it by simply get the Apple's FTPSample project and replace the 'listOrCancelAction' selector of the file 'ListController.m' with the following:
- (IBAction)listOrCancelAction:(id)sender
{
#pragma unused(sender)
if (!self.isReceiving)
[self startReceive];
[self performSelector:#selector(listOrCancelAction:) withObject:sender afterDelay:1.0];
}
This way you can click the 'List' button only one time. After a while the application crash.
My environment:
Mac OS X 10.7.4;
XCode 4.6 (iOS SDK 6.1);
iPad3 updated to iOS 6.1;
Stack trace:
Incident Identifier: BAE3971A-4C82-4D91-A5FE-34748740CEB4
CrashReporter Key: d89bdbe7d8601b5d1230f3e2dbe4d7164277af23
Hardware Model: iPad3,1
Process: FTPSample [5102]
Path: /var/mobile/Applications/622BE7B0-B65D-40B4-BCBA-62BCF71657CA/FTPSample.app/FTPSample
Identifier: FTPSample
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-02-09 20:12:40.211 +0100
OS Version: iOS 6.1 (10B141)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000030
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 CFNetwork 0x31c8ec24 _ZL13_WriteCommandP26_CFFTPNetConnectionContextP19_CFFTPStreamContextPK10__CFString + 64
1 CFNetwork 0x31c8ed8a _ZL13_StartProcessP26_CFFTPNetConnectionContextP19_CFFTPStreamContext + 222
2 CFNetwork 0x31c8e72c _ZL33_FTPConnectionRequestStateChangedP19_CFFTPStreamContextN13NetConnection5StateEP13CFStreamErrorP21NetConnection_ClassicP26_CFFTPNetConnectionContext + 108
3 CFNetwork 0x31cb5b3a NetConnection_Classic::requestStateChanged(void*, NetConnection::State, CFStreamError*) + 26
4 CFNetwork 0x31c65ee0 NetConnection::enqueue(void*, unsigned char) + 316
5 CFNetwork 0x31c8c1ce _ZL14_FTPStreamOpenPKvP13CFStreamErrorPhP19_CFFTPStreamContext + 3414
6 CFNetwork 0x31cfbcbe CoreReadStreamWithCallBacks::_streamImpl_Open(CFStreamError*, unsigned char*) + 38
7 CFNetwork 0x31cfbdae non-virtual thunk to CoreReadStreamWithCallBacks::_streamImpl_Open(CFStreamError*, unsigned char*) + 6
8 CFNetwork 0x31cfd04a CoreStreamBase::_streamInterface_Open() + 42
9 CFNetwork 0x31cfb7b8 CoreStreamCFStreamSupport<__CFReadStream*, CoreReadStream>::_stream_open(__CFReadStream*, CFStreamError*, unsigned char*, void*) + 36
10 CoreFoundation 0x31f4d3f4 _CFStreamOpen + 72
11 CoreFoundation 0x31f682f6 CFReadStreamOpen + 86
12 FTPSample 0x0008083e -[ListController startReceive] (ListController.m:184)
13 FTPSample 0x000815fc -[ListController listOrCancelAction:] (ListController.m:393)
14 UIKit 0x33eed0c0 -[UIApplication sendAction:to:from:forEvent:] + 68
15 UIKit 0x33eed148 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 116
16 UIKit 0x33eed0c0 -[UIApplication sendAction:to:from:forEvent:] + 68
17 UIKit 0x33eed072 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
18 UIKit 0x33eed050 -[UIControl sendAction:to:forEvent:] + 40
19 UIKit 0x33eec906 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 498
20 UIKit 0x33eecdfc -[UIControl touchesEnded:withEvent:] + 484
21 UIKit 0x33e155ec -[UIWindow _sendTouchesForEvent:] + 520
22 UIKit 0x33e027fc -[UIApplication sendEvent:] + 376
23 UIKit 0x33e02116 _UIApplicationHandleEvent + 6150
24 GraphicsServices 0x35af45a0 _PurpleEventCallback + 588
25 GraphicsServices 0x35af41ce PurpleEventCallback + 30
26 CoreFoundation 0x31fcf170 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
27 CoreFoundation 0x31fcf112 __CFRunLoopDoSource1 + 134
28 CoreFoundation 0x31fcdf94 __CFRunLoopRun + 1380
29 CoreFoundation 0x31f40eb8 CFRunLoopRunSpecific + 352
30 CoreFoundation 0x31f40d44 CFRunLoopRunInMode + 100
31 GraphicsServices 0x35af32e6 GSEventRunModal + 70
32 UIKit 0x33e562fc UIApplicationMain + 1116
33 FTPSample 0x0007ad90 main (main.m:61)
34 FTPSample 0x0007a354 start + 36
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x3a373648 kevent64 + 24
1 libdispatch.dylib 0x3a2a3974 _dispatch_mgr_invoke + 792
2 libdispatch.dylib 0x3a2a3654 _dispatch_mgr_thread$VARIANT$mp + 32
Thread 2 name: WebThread
Thread 2:
0 libsystem_kernel.dylib 0x3a372eb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3a373048 mach_msg + 36
2 CoreFoundation 0x31fcf040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x31fcdd9e __CFRunLoopRun + 878
4 CoreFoundation 0x31f40eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x31f40d44 CFRunLoopRunInMode + 100
6 WebCore 0x37f26500 _ZL12RunWebThreadPv + 440
7 libsystem_c.dylib 0x3a2dc30e _pthread_start + 306
8 libsystem_c.dylib 0x3a2dc1d4 thread_start + 4
Thread 3:
0 libsystem_kernel.dylib 0x3a383d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3a2d1cf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3a2d1a12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3a2d18a0 start_wqthread + 4
Thread 4:
0 libsystem_kernel.dylib 0x3a383d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3a2d1cf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3a2d1a12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3a2d18a0 start_wqthread + 4
Thread 5:
0 libsystem_kernel.dylib 0x3a383d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3a2d1cf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3a2d1a12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3a2d18a0 start_wqthread + 4
Thread 6 name: com.apple.CFSocket.private
Thread 6:
0 libsystem_kernel.dylib 0x3a383594 __select + 20
1 CoreFoundation 0x31fd31f2 __CFSocketManager + 674
2 libsystem_c.dylib 0x3a2dc30e _pthread_start + 306
3 libsystem_c.dylib 0x3a2dc1d4 thread_start + 4
Thread 0 crashed with ARM Thread State (32-bit):
r0: 0x00000007 r1: 0x1f84c9f8 r2: 0x1f84c9f8 r3: 0x00000004
r4: 0x00000000 r5: 0x1f852a30 r6: 0x00000007 r7: 0x2fd86518
r8: 0x0000000b r9: 0x000a1934 r10: 0x1f858e70 r11: 0x1f84c9f0
ip: 0x3a492970 sp: 0x2fd864e8 lr: 0x31c8ec1f pc: 0x31c8ec24
cpsr: 0x60000030
Binary Images:
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0x2feea000 - 0x2ff0afff dyld armv7 <454baf45f9a831aa88e1ea4447c58d4e> /usr/lib/dyld
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0x31203000 - 0x31341fff vImage armv7 <30522b92940d3dd184c8e46780594048> /System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/vImage
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0x31748000 - 0x31748fff vecLib armv7 <a7751c047dcc35ba8885212e1938b93f> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib
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0x31d15000 - 0x31d6bfff CoreAudio armv7 <5d534dbf76ff30f4a628f25f56c5f26a> /System/Library/Frameworks/CoreAudio.framework/CoreAudio
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0x3206b000 - 0x321a3fff CoreGraphics armv7 <81e213f810a034d4ba411f9b505da2a6> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
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0x3346c000 - 0x3346efff libCoreVMClient.dylib armv7 <af6ff28dce6031baaa850ccc79e5699b> /System/Library/Frameworks/OpenGLES.framework/libCoreVMClient.dylib
0x3346f000 - 0x33473fff libGFXShared.dylib armv7 <a6ac1673a088379aa512ba5cac301f5b> /System/Library/Frameworks/OpenGLES.framework/libGFXShared.dylib
0x33474000 - 0x334b1fff libGLImage.dylib armv7 <b8b8f3a1bfd0345e86aa0c2952534949> /System/Library/Frameworks/OpenGLES.framework/libGLImage.dylib
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0x33dbd000 - 0x33dfcfff SystemConfiguration armv7 <410d69b356e533d6a1d538cf33059634> /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration
0x33dff000 - 0x34353fff UIKit armv7 <ad8b3ad23f413187a178179db39cfa6b> /System/Library/Frameworks/UIKit.framework/UIKit
0x34354000 - 0x34392fff VideoToolbox armv7 <d2e8067306d9346ab4a448f10f336894> /System/Library/Frameworks/VideoToolbox.framework/VideoToolbox
0x3465c000 - 0x3465ffff AggregateDictionary armv7 <a2170ad876f13ef1b944547913d05af2> /System/Library/PrivateFrameworks/AggregateDictionary.framework/AggregateDictionary
0x34a8b000 - 0x34ac6fff AppSupport armv7 <921794b7d82a3558a0eb860979be199c> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport
0x34b39000 - 0x34b42fff AssetsLibraryServices armv7 <de7ca29cd47433cd8eca9c04102f5508> /System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices
0x34b71000 - 0x34b88fff BackBoardServices armv7 <585cc62d83c530ee82988de940c1e161> /System/Library/PrivateFrameworks/BackBoardServices.framework/BackBoardServices
0x34b92000 - 0x34bb6fff Bom armv7 <b5315d733e123a0781683efdc734064b> /System/Library/PrivateFrameworks/Bom.framework/Bom
0x34dec000 - 0x34df1fff CommonUtilities armv7 <f8fea9ee6ca236b0a7fa6c00eb8a0d24> /System/Library/PrivateFrameworks/CommonUtilities.framework/CommonUtilities
0x350b7000 - 0x350b8fff CoreSurface armv7 <6065f7e040e93d6ea2837e929592cc30> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface
0x35125000 - 0x3512afff CrashReporterSupport armv7 <03ee46e3ca3f3920a7174e62096723fb> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport
0x35351000 - 0x3536afff DictionaryServices armv7 <84669055e3e63d6ab56b8fe7b0476aaa> /System/Library/PrivateFrameworks/DictionaryServices.framework/DictionaryServices
0x353dd000 - 0x357f0fff FaceCoreLight armv7 <43de0b31da3b39e4acf85ec2c8d5c65c> /System/Library/PrivateFrameworks/FaceCoreLight.framework/FaceCoreLight
0x359e8000 - 0x359f4fff GenerationalStorage armv7 <d77ad2367fff37d485480aa39df7d325> /System/Library/PrivateFrameworks/GenerationalStorage.framework/GenerationalStorage
0x35aee000 - 0x35af9fff GraphicsServices armv7 <d4b7fd6509753bff9525fef374ddc359> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x35de5000 - 0x35e31fff IMFoundation armv7 <797535fc363c3f818bcd1424251393bf> /System/Library/PrivateFrameworks/IMFoundation.framework/IMFoundation
0x35e38000 - 0x35e39fff IOAccelerator armv7 <9655464326203d258d3d0fc7e94651e2> /System/Library/PrivateFrameworks/IOAccelerator.framework/IOAccelerator
0x35e3a000 - 0x35e3ffff IOMobileFramebuffer armv7 <f38c374982a931d5a47458dd3c34ac59> /System/Library/PrivateFrameworks/IOMobileFramebuffer.framework/IOMobileFramebuffer
0x35e40000 - 0x35e44fff IOSurface armv7 <a55bf03c35de3fd9b56dce82083c3d10> /System/Library/PrivateFrameworks/IOSurface.framework/IOSurface
0x35e8e000 - 0x36034fff JavaScriptCore armv7 <a5780997f4b738659172f40877c9a7d9> /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore
0x3632f000 - 0x3635cfff MobileAsset armv7 <3a9e6258ae1230f5b12f1638b09cb974> /System/Library/PrivateFrameworks/MobileAsset.framework/MobileAsset
0x363a1000 - 0x363a4fff MobileInstallation armv7 <c63e4b1ae40635cd9c6a7de851c80d10> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation
0x363a5000 - 0x363abfff MobileKeyBag armv7 <35882c57076334aeb0641969a9b69ff3> /System/Library/PrivateFrameworks/MobileKeyBag.framework/MobileKeyBag
0x36408000 - 0x3640bfff MobileSystemServices armv7 <10b4eee2739c353183ac2cfe4e39a443> /System/Library/PrivateFrameworks/MobileSystemServices.framework/MobileSystemServices
0x36cf8000 - 0x36d1dfff OpenCL armv7 <5bf059a9deb632678d70099f14f51b82> /System/Library/PrivateFrameworks/OpenCL.framework/OpenCL
0x37331000 - 0x37359fff PrintKit armv7 <3f0b9c58a458358eb506858e8ff9e1fe> /System/Library/PrivateFrameworks/PrintKit.framework/PrintKit
0x3735a000 - 0x373cefff ProofReader armv7 <9cb25467554637bcb268ba30527d3c0f> /System/Library/PrivateFrameworks/ProofReader.framework/ProofReader
0x37513000 - 0x37524fff SpringBoardServices armv7 <e2571f80a0ad3dc580c69794457bd887> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices
0x376af000 - 0x376b1fff TCC armv7 <d5bef30a5bda315194173b862975f9fb> /System/Library/PrivateFrameworks/TCC.framework/TCC
0x376d0000 - 0x376ddfff TelephonyUtilities armv7 <803d7a92439238ee942086999c481eb6> /System/Library/PrivateFrameworks/TelephonyUtilities.framework/TelephonyUtilities
0x37b60000 - 0x37c00fff UIFoundation armv7 <9a464526e26634bc834537e5ac3abf1f> /System/Library/PrivateFrameworks/UIFoundation.framework/UIFoundation
0x37efc000 - 0x37f1bfff WebBookmarks armv7 <77b65bc9c87b367ebea9a5b7984b13a5> /System/Library/PrivateFrameworks/WebBookmarks.framework/WebBookmarks
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0x389d4000 - 0x389dbfff XPCObjects armv7 <723fe314ab95381cbfa69a0000005692> /System/Library/PrivateFrameworks/XPCObjects.framework/XPCObjects
0x396fe000 - 0x39704fff libAccessibility.dylib armv7 <f40705b5e9c43ce3b1f185fe690b9ac8> /usr/lib/libAccessibility.dylib
0x39705000 - 0x3971bfff libCRFSuite.dylib armv7 <5a8a3d18a1ff3c97bd773705fef2d81c> /usr/lib/libCRFSuite.dylib
0x39733000 - 0x3973ffff libMobileGestalt.dylib armv7 <ea41737238273d73b173ec09358d7b62> /usr/lib/libMobileGestalt.dylib
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0x3a265000 - 0x3a29afff libcorecrypto.dylib armv7 <04b464137fc2304b84eeed1a5418f4a8> /usr/lib/system/libcorecrypto.dylib
0x3a29b000 - 0x3a2b8fff libdispatch.dylib armv7 <9323bb560d4e3a3fb41efdc78bd0cf94> /usr/lib/system/libdispatch.dylib
0x3a2b9000 - 0x3a2bafff libdnsinfo.dylib armv7 <c25502085c833181b2a12cf525cffde6> /usr/lib/system/libdnsinfo.dylib
0x3a2bb000 - 0x3a2bcfff libdyld.dylib armv7 <82229500ed4132ecbe012e0774e5fc4a> /usr/lib/system/libdyld.dylib
0x3a2bd000 - 0x3a2bdfff libkeymgr.dylib armv7 <e19c865e73e2352bbc8022033e953f22> /usr/lib/system/libkeymgr.dylib
0x3a2be000 - 0x3a2c3fff liblaunch.dylib armv7 <c8bedc36bc3d3b55b91b12ebb1240968> /usr/lib/system/liblaunch.dylib
0x3a2c4000 - 0x3a2c7fff libmacho.dylib armv7 <965ab939e24935e7a3a65981574a7745> /usr/lib/system/libmacho.dylib
0x3a2c8000 - 0x3a2c9fff libremovefile.dylib armv7 <295706037a5238b4aa145df7b9354a0e> /usr/lib/system/libremovefile.dylib
0x3a2ca000 - 0x3a2cafff libsystem_blocks.dylib armv7 <50a01a02f573317fbd21e1070b0afc7d> /usr/lib/system/libsystem_blocks.dylib
0x3a2cb000 - 0x3a351fff libsystem_c.dylib armv7 <cacc68d271e53338b7780c26f651b767> /usr/lib/system/libsystem_c.dylib
0x3a352000 - 0x3a358fff libsystem_dnssd.dylib armv7 <6c5ac17133a1366aaeea5dc38dceaf1f> /usr/lib/system/libsystem_dnssd.dylib
0x3a359000 - 0x3a371fff libsystem_info.dylib armv7 <5a4a4c9da868317db7f17cb616eb32d1> /usr/lib/system/libsystem_info.dylib
0x3a372000 - 0x3a388fff libsystem_kernel.dylib armv7 <8e995919df713a8783f23e7f6649bf09> /usr/lib/system/libsystem_kernel.dylib
0x3a389000 - 0x3a3a5fff libsystem_m.dylib armv7 <036ea0321da038e8b69a0c4413da00fe> /usr/lib/system/libsystem_m.dylib
0x3a3a6000 - 0x3a3b4fff libsystem_network.dylib armv7 <afc167a2e9be3dd6851da8deaf42bafd> /usr/lib/system/libsystem_network.dylib
0x3a3b5000 - 0x3a3bcfff libsystem_notify.dylib armv7 <c1d71aa978383c51a9ba2b32782d6cc6> /usr/lib/system/libsystem_notify.dylib
0x3a3bd000 - 0x3a3befff libsystem_sandbox.dylib armv7 <45bb99d46408351a9c61b5326032adea> /usr/lib/system/libsystem_sandbox.dylib
0x3a3bf000 - 0x3a3bffff libunwind.dylib armv7 <df8f1d90cbb837cc92d5901fab94e6ca> /usr/lib/system/libunwind.dylib
0x3a3c0000 - 0x3a3d5fff libxpc.dylib armv7 <7f983066ea4c3c119f3e2344a04fef6e> /usr/lib/system/libxpc.dylib
Any hints?
Thanks in advance,
AGPX