iPhone:How to find infrequent device crash?

Question

I am getting infrequent crashes from my source code project. I couldn't find out the exact reproducible steps though i have tried to reproduce so many times. During dubug on the device is becoming very hard to reproduce it, because it happens somewhere and sometimes. Is there any logs printing while crashing the device (or) any other tools/way to find out exactly where could it happen, in iPhone Xcode development?

Thanks and Appreciate your help on this.

Here is my app latest crash: Can someone find any reason?

Incident Identifier: 96E3C178-967C-4054-8470-A8628D77EDE1 CrashReporter Key: 0e061dbe05ca13005016137051a2c0ef819425e9 Process: myapplication [4472] Path: /var/mobile/Applications/A8483A85-E5A5-46CF-B9B8-4D99F5C951F9/myapplication.app/myapplication Identifier: myapplication Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1]

Date/Time: 2009-11-17 17:27:49.366 +0530 OS Version: iPhone OS 3.0 (7A341) Report Version: 104

Exception Type: 00000020 Exception Codes: 0x8badf00d Highlighted Thread: 0

Application Specific Information: com.mycompany.myapplication failed to launch in time elapsed total CPU time (seconds): 3.630 (user 1.430, system 2.200), 18% CPU elapsed application CPU time (seconds): 1.050, 5% CPU

Thread 0: 0 libSystem.B.dylib 0x31d47158 mach_msg_trap + 20 1 libSystem.B.dylib 0x31d49ed8 mach_msg + 60 2 CoreFoundation 0x3025454e CFRunLoopRunSpecific + 982 3 CoreFoundation 0x30254164 CFRunLoopRunInMode + 44 4 UIKit 0x308f034c -[UIApplication _run] + 512 5 UIKit 0x308eea8c UIApplicationMain + 960 6 myapplication 0x00002090 main (main.m:14) 7 myapplication 0x0000202c start + 44

Thread 1: 0 libSystem.B.dylib 0x31d47158 mach_msg_trap + 20 1 libSystem.B.dylib 0x31d49ed8 mach_msg + 60 2 CoreFoundation 0x3025454e CFRunLoopRunSpecific + 982 3 CoreFoundation 0x30254164 CFRunLoopRunInMode + 44 4 WebCore 0x3588dbc8 __ZL12RunWebThreadPv + 412 5 libSystem.B.dylib 0x31d705a0 _pthread_body + 20

Unknown thread crashed with unknown flavor: 5, state_count: 1

Binary Images: 0x1000 - 0xbfff +myapplication armv6 /var/mobile/Applications/A8483A85-E5A5-46CF-B9B8-4D99F5C951F9/myapplication.app/myapplication 0x1f000 - 0x22fff +MobileSubstrate.dylib armv6 /Library/MobileSubstrate/MobileSubstrate.dylib 0x4d000 - 0x4efff dns.so armv6 <7943354b648b9518f46a835d5359e45a> /usr/lib/info/dns.so 0x51000 - 0x51fff +SimulatedKeyEvents.dylib arm /Library/MobileSubstrate/DynamicLibraries/SimulatedKeyEvents.dylib 0x2fe00000 - 0x2fe26fff dyld armv6 <384bf84ebe2b822c3cb75fce3e8647d6> /usr/lib/dyld 0x30000000 - 0x30008fff libgcc_s.1.dylib armv6 /usr/lib/libgcc_s.1.dylib 0x3000c000 - 0x3015bfff libobjc.A.dylib armv6 <92636cf8b8e8f3c10721667c48ca182b> /usr/lib/libobjc.A.dylib 0x301ca000 - 0x301d8fff libz.1.dylib armv6 /usr/lib/libz.1.dylib 0x301fd000 - 0x302a8fff CoreFoundation armv6 <3e02f5628a56bce4c9eb1c5e49c863d4> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 0x30501000 - 0x305f5fff Foundation armv6 /System/Library/Frameworks/Foundation.framework/Foundation 0x3071d000 - 0x30729fff CoreVideo armv6 <5404da375ad190f3e1404e5e8a70f764> /System/Library/PrivateFrameworks/CoreVideo.framework/CoreVideo 0x3073a000 - 0x30760fff AppSupport armv6 <1baa1e22eb94eb405d724a2f6b219f53> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport 0x30778000 - 0x3077dfff liblockdown.dylib armv6 /usr/lib/liblockdown.dylib 0x308ed000 - 0x31521fff UIKit armv6 <73cf70d65e1afef2a6ae94fb81bf2fe4> /System/Library/Frameworks/UIKit.framework/UIKit 0x31885000 - 0x318d1fff IOKit armv6 <56ba629c062ac21a045914430412c5f4> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x318e9000 - 0x31aa2fff CoreGraphics armv6 <80bccae4ab17a49f7fc3a66bb2def894> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics 0x31af1000 - 0x31b58fff CFNetwork armv6 <863076d9b768c76272e3f0f686ca355d> /System/Library/Frameworks/CFNetwork.framework/CFNetwork 0x31bb2000 - 0x31bc8fff OpenGLES armv6 <2c30348868df45d3b8e0e398e0e4f727> /System/Library/Frameworks/OpenGLES.framework/OpenGLES 0x31bcf000 - 0x31cccfff JavaScriptCore armv6 <619918c7282aa5b53ac3ad32c320b7a5> /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore 0x31d46000 - 0x31e69fff libSystem.B.dylib armv6 /usr/lib/libSystem.B.dylib 0x31ea9000 - 0x31feffff AudioToolbox armv6 /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox 0x32041000 - 0x3204bfff GraphicsServices armv6 <99b0baa68c257ca5d2fed21bd409ea20> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices 0x3209b000 - 0x320cefff Security armv6 <34c21a865d91e9a13477e9395c516f8c> /System/Library/Frameworks/Security.framework/Security 0x320e8000 - 0x32194fff ImageIO armv6 <44921d26b2b796c2c707c87c68026b16> /System/Library/PrivateFrameworks/ImageIO.framework/ImageIO 0x32369000 - 0x3239cfff SystemConfiguration armv6 /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration 0x324c6000 - 0x32521fff CoreAudio armv6 /System/Library/Frameworks/CoreAudio.framework/CoreAudio 0x325b2000 - 0x325cefff AddressBook armv6 <3023a336aec321324b5a310ee66687f1> /System/Library/Frameworks/AddressBook.framework/AddressBook 0x3291c000 - 0x329c4fff QuartzCore armv6 <1cf2a12e661e1a49f90553b013283b29> /System/Library/Frameworks/QuartzCore.framework/QuartzCore 0x32a16000 - 0x32a16fff CoreSurface armv6 <2c60135f696b1a787443c4a68e1aced2> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface 0x32a1b000 - 0x32a1cfff IOMobileFramebuffer armv6 <05aa0565d0f6813003dc5dc175af6048> /System/Library/PrivateFrameworks/IOMobileFramebuffer.framework/IOMobileFramebuffer 0x32e0c000 - 0x32f0dfff libicucore.A.dylib armv6 <3f78cbbe6b5b7d3b4c5753627fcebdee> /usr/lib/libicucore.A.dylib 0x3311e000 - 0x33213fff libxml2.2.dylib armv6 <3398aecf5ef07d7bbe6673fc9ab570fb> /usr/lib/libxml2.2.dylib 0x332c9000 - 0x33372fff WebKit armv6 /System/Library/PrivateFrameworks/WebKit.framework/WebKit 0x3415c000 - 0x34165fff SpringBoardServices armv6 <4997adf422af4a9eecf25aa9bcaf8fc9> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices 0x347f5000 - 0x34812fff libresolv.9.dylib armv6 <7e34a4dd5c5b0400d10b01e998d5b2de> /usr/lib/libresolv.9.dylib 0x34c0e000 - 0x34c14fff MBX2D armv6 <6815ceba8853af0095f160b6d3c88937> /System/Library/PrivateFrameworks/MBX2D.framework/MBX2D 0x3553e000 - 0x3557bfff CoreText armv6 /System/Library/PrivateFrameworks/CoreText.framework/CoreText 0x355c8000 - 0x355ccfff IOSurface armv6 /System/Library/PrivateFrameworks/IOSurface.framework/IOSurface 0x3580b000 - 0x35f5afff WebCore armv6 <98f065e46e4c230bf091abaf6da60c16> /System/Library/PrivateFrameworks/WebCore.framework/WebCore 0x36422000 - 0x3647cfff libsqlite3.dylib armv6 <456f75f502443d281147f36f6ed4c3d3> /usr/lib/libsqlite3.dylib 0x3648a000 - 0x36493fff libkxld.dylib armv6 <2528ee7a4fd041090850f1845c393b84> /usr/lib/system/libkxld.dylib 0x36496000 - 0x364a6fff libbsm.0.dylib armv6 <44ee6b2c59cd5aa70d59f7d0d0d3b0b2> /usr/lib/libbsm.0.dylib 0x37124000 - 0x3712efff MobileCoreServices armv6 <9adf227705e932c47e703f73ca1d87c2> /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices 0x3748a000 - 0x374f3fff libstdc++.6.dylib armv6 <44d54be7409eedbf35157cc538ea660b> /usr/lib/libstdc++.6.dylib 0x37c74000 - 0x37c74fff Accelerate armv6 /System/Library/PrivateFrameworks/Accelerate.framework/Accelerate 0x37cc8000 - 0x37d0bfff libvDSP.dylib armv6 <5632d3e7799c5c90540157938bce4b95> /System/Library/PrivateFrameworks/Accelerate.framework/Frameworks/vecLib.framework/libvDSP.dylib 0x37d12000 - 0x37d12fff vecLib armv6 /System/Library/PrivateFrameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib

Answer 1

You should be able to get a crash log.

In the crash log, you'll have a stack trace of what was happening when the application crashed.

Look through the stack trace for the last thing you were doing. The last thing in the trace will likely be within a framework method that you call, so trace the call back to your code and use that as the starting point.

Once you know where in your code the crash occurred, try to think of what might have caused the crash. If you're having trouble seeing what might have caused the crash, post the line that lead to the crash (along with the surround code) here and we might have some insight as to what caused it.

If you're also looking for resources on what Xcode has to offer to debug, have a read of the Xcode Debugging Guide.

Answer 2

Using static analysis on Xcode in 10.6 will probably be enlightening. I have found many errors that raised no warnings that way.