Question

I am building this app and I am encountering some issues I haven’t seen before.

1. the app crashes when I run the method below which is connected to a UIButton for a trigger. so when I hit the button it does the print and then the simulator crashes to the springboard. if I launch the app again from the springboard it doesn’t get to the print method, if I rebuild from Xcode it does, and then promptly crashes as before.

2. Usually there is some info in the debug console where I can at least get a clue as to what is going on but there doesn’t seem to be much there. One thing I noticed is that there is something about accessibility being turned on or something when the app initially launches in the simulator, I can’t remember if that is always there or not:

2010-02-18 10:35:19.024 Cash[497:207]
******* Accessibility Status Changed: On 2010-02-18 10:35:19.134
Cash[497:207] ********** Loading AX
for: com.yourcompany.Cash ************

copyright 2010 Nicholas Iannone:

-(IBAction) logTransaction {

NSIndexPath *indexPath = [[NSIndexPath alloc] init];
indexPath = [self.categoryTableView indexPathForSelectedRow];

NSInteger selectedCategory = indexPath.row;
[indexPath release];
NSString *categoryString = [[NSString alloc] init];
categoryString = [self.categoryArray objectAtIndex:selectedCategory];
CLLocationManager *locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = 1000.0f;
[locationManager startUpdatingLocation];
double x = 10.0;
double y = 10.0;
NSString *descriptionString = [[NSString alloc] init];

descriptionString = descriptionField.text;
//[locationManager stopUpdatingLocation];

Transaction *newTransaction = [[Transaction alloc] initWithAmount:    [self.amountField.text integerValue] 
                                                      description: descriptionString 
                                                         category: categoryString   
                                                        locationX: x 
                                                        locationY: y];

                                      [categoryString release];
[newTransaction print];

 //log transaction here...

[newTransaction release];

here’s the console output:

2/18/10 10:35:19
AM Cash[497] ********** Loading AX
for: com.yourcompany.Cash ************
2/18/10 10:35:28
AM Cash[497] 0.000000,sddssd,Snacks,2010-02-18
10:35:28 -0800,10.000000,10.000000
2/18/10 10:35:28
AM com.apple.launchd.peruser.501[91] (UIKitApplication:com.yourcompany.Cash[0x9148][497])
Job appears to have crashed:
Segmentation fault 2/18/10 10:35:28
AM SpringBoard[482] Application ‘Cash’
exited abnormally with signal 11:
Segmentation fault 2/18/10 10:35:28
AM ReportCrash[491] Saved crash report
for Cash[497] version ??? (???) to
/Users/knyck2/Library/Logs/DiagnosticReports/Cash_2010-02-18-103528_Nicholas-Iannones-MacBook-Pro.crash

here’s the crash log:

Process: Cash [497] Path:
/Users/knyck2/Library/Application
Support/iPhone
Simulator/3.2/Applications/F54FA00C-9E77-4B9A-8774-2D5B5488A1BA/Cash.app/Cash
Identifier: Cash Version:
??? (???) Code Type: X86
(Native) Parent Process: launchd [91]

Date/Time: 2010-02-18
10:35:28.631 -0800 OS Version:
Mac OS X 10.6.2 (10C540) Report
Version: 6

Exception Type: EXC_BAD_ACCESS
(SIGSEGV) Exception Codes:
KERN_INVALID_ADDRESS at
0x0000000014600478 Crashed Thread: 0
Dispatch queue: com.apple.main-thread

Application Specific Information:
objc_msgSend() selector name: release
iPhone Simulator 3.2 (193), iPhone OS
3.2 (7B298g)

Thread 0 Crashed: Dispatch queue:
com.apple.main-thread 0
libobjc.A.dylib
0x9805aedb objc_msgSend + 27 1
UIKit
0x002b4a19 _UIApplicationHandleEvent
+ 8468 2 GraphicsServices 0x02f1f2a8 PurpleEventCallback + 1576
3 CoreFoundation
0x026bb87e CFRunLoopRunSpecific +
4094 4 CoreFoundation
0x026ba878 CFRunLoopRunInMode + 88 5
GraphicsServices
0x02f1da4d GSEventRunModal + 217 6
GraphicsServices
0x02f1db12 GSEventRun + 115 7 UIKit
0x002b265d UIApplicationMain + 1134 8
Cash
0x00002648 main + 102 (main.m:13) 9
Cash
0x000025b6 start + 54

Thread 1: 0 libSystem.B.dylib
0x937b88da mach_msg_trap + 10 1
libSystem.B.dylib
0x937b9047 mach_msg + 68 2
CoreFoundation
0x026bb022 CFRunLoopRunSpecific +
1954 3 CoreFoundation
0x026ba878 CFRunLoopRunInMode + 88 4
WebCore
0x03151933 RunWebThread(void*) + 467
5 libSystem.B.dylib
0x937e5fbd _pthread_start + 345 6
libSystem.B.dylib
0x937e5e42 thread_start + 34

Thread 0 crashed with X86 Thread State
(32-bit): eax: 0x07802a50 ebx:
0x00017711 ecx: 0x9655d0c4 edx:
0x07833ba2 edi: 0x14600478 esi:
0x00000000 ebp: 0xbfffe158 esp:
0xbfffdfd4 ss: 0x0000001f efl:
0x00010206 eip: 0x9805aedb cs:
0x00000017 ds: 0x0000001f es:
0x0000001f fs: 0x00000000 gs:
0x00000037 cr2: 0x14600478

Binary Images:
0x1000 – 0x5ff7 +Cash ??? (???)

/Users/knyck2/Library/Application
Support/iPhone
Simulator/3.2/Applications/F54FA00C-9E77-4B9A-8774-2D5B5488A1BA/Cash.app/Cash
0xd000 – 0xfff7 +PBGDBIntrospectionSupport.A.dylib ??? (???)
<8C448816-8655-143E-DA39-C8157FDA8C8B>
/Developer/Applications/Xcode.app/Contents/PlugIns/GDBMIDebugging.xcplugin/Contents/Resources/PBGDBIntrospectionSupport.A.dylib
0x14000 – 0x1a8ff3 +Foundation ???
(???)
<4361202B-C361-85C9-AAD0-3D062EF44941>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Foundation.framework/Foundation
0x29e000 – 0x2063fe7 +UIKit ??? (???)
<524597DC-F210-115D-E31D-01A3429E25C7>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/UIKit.framework/UIKit
0x23be000 – 0x25c6fe7
com.apple.CoreGraphics 1.359.16 (???)
<017CBE03-17D3-25FD-E775-087B415993AA>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
0x262e000 – 0x2665ff7 +CoreLocation
??? (???)
<80CA49D0-A8EA-0638-A407-0CC131AEEB41>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreLocation.framework/CoreLocation
0x268e000 – 0x2799fff +CoreFoundation
??? (???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x287d000 – 0x2a15fe7
+libicucore.A.dylib ??? (???) <13A09086-26EF-E491-ADD8-9019C31542FC>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libicucore.A.dylib
0x2a76000 – 0x2b75fe7
+libxml2.2.dylib ??? (???) <78BEDCC4-E0FD-1C59-70ED-46FB3D76055C>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libxml2.2.dylib
0x2b9a000 – 0x2c41fe7 +CFNetwork ???
(???)
<24AFEAF9-230F-C79A-3A2F-BB9F1945CF9A>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CFNetwork.framework/CFNetwork
0x2cc0000 – 0x2cf4ff7
+SystemConfiguration ??? (???) <5448E217-DB17-F241-AB84-C2FE18372948>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration
0x2d16000 – 0x2d65ff7 +Security ???
(???)
<90BF3878-B2F5-8FD0-4E81-B59E64C47E1D>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/Security.framework/Security
0x2d8b000 – 0x2e58fe7
+libsqlite3.dylib ??? (???) <3B663A82-D85F-3CD5-130C-FAA6C5ED2D0E>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libsqlite3.dylib
0x2e68000 – 0x2ef3fff
com.apple.framework.IOKit 1.5.1 (???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x2f19000 – 0x2f26ff3
+GraphicsServices ??? (???) <7FB2250F-CDD1-D975-0387-6E884CC061CD>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x2f39000 – 0x3071ff7 +JavaScriptCore
??? (???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore
0x30c5000 – 0x3888fe7 +WebCore ???
(???)
<8801B91D-C8BC-51CC-B80A-FB9C67BA8FF2>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/WebCore.framework/WebCore
0x3db5000 – 0x3e4bff7 +WebKit ???
(???)
<0D579ECA-E22E-7C70-A214-73D2221CD1C7>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/WebKit.framework/WebKit
0x3ec9000 – 0x3f87fe7 +ImageIO ???
(???)
<524C2CFC-6F77-3B4F-390F-40711BB56980>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/ImageIO.framework/ImageIO
0x3fb2000 – 0x3fd0ff7 +AddressBook
??? (???)
<2EF304E3-4B16-5B0E-E072-BFABF4B44CF5>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/AddressBook.framework/AddressBook
0x3ff1000 – 0x4145fe7 +AudioToolbox
??? (???)
<27DC788A-231B-9DB5-0B48-04A2A8D27F32>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox
0x4198000 – 0x425aff7 +QuartzCore ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/QuartzCore.framework/QuartzCore
0x42b5000 – 0x42c2ff7
+SpringBoardServices ??? (???) <3CDBCAE3-B6D3-D734-6CB0-AB39EBBE7D57>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices
0x42cd000 – 0x42f9fff +AppSupport ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/AppSupport.framework/AppSupport
0x4319000 – 0x435cfe7 +CoreText ???
(???)
<971632EA-E809-8D15-BE25-E115A4FBDFF4>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreText.framework/CoreText
0x438c000 – 0x43c7ff7
+MobileCoreServices ??? (???) <5BFA76AC-EC1B-8D9F-4533-B3DD44041107>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices
0x43e5000 – 0x448efe7 +ProofReader
??? (???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/ProofReader.framework/ProofReader
0x44ab000 – 0x44b6ff7 +CoreVideo ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/CoreVideo.framework/CoreVideo
0x44c2000 – 0x44d8fe7 +OpenGLES ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/OpenGLES.framework/OpenGLES
0x44e2000 – 0x4558ff3 +CoreAudio ???
(???)
<14C17E9E-0D13-A7BD-3A06-C3F460FD261C>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreAudio.framework/CoreAudio
0x4594000 – 0x4649fe7
libcrypto.0.9.7.dylib ??? (???)
<39CDB041-9DF5-01B1-4B33-03EC4CCA40B3>
/usr/lib/libcrypto.0.9.7.dylib
0x468f000 – 0x46b5fff
libssl.0.9.7.dylib ??? (???)
<924E1BF8-C24D-4A5C-3DB6-A85034392D19>
/usr/lib/libssl.0.9.7.dylib 0x46ea000
– 0x46eaff7 +AccessibilitySettingsLoader ??? (???) <21BFF58D-21D2-210F-3150-873A8CC87399>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/AccessibilityBundles/AccessibilitySettingsLoader.bundle/AccessibilitySettingsLoader
0x46ef000 – 0x46f1ff7
+libAccessibility.dylib ??? (???) <9F1CEAA6-2910-7F97-A626-DAA33724ED79>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libAccessibility.dylib 0x7900000 – 0x7909ffb +IAP ??? (???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/IAP.framework/IAP
0x7916000 – 0x794cff7 +UIKit ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/AccessibilityBundles/UIKit.axbundle/UIKit
0x7990000 – 0x799bff7
+UIAccessibility ??? (???) <4E2BD72C-F67F-D0DF-78FA-FB1D5840F6B7>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/UIAccessibility.framework/UIAccessibility
0x79ab000 – 0x79baff7 +AXRuntime ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/AXRuntime.framework/AXRuntime
0x79c8000 – 0x7a0afe7
+libCGFreetype.A.dylib ??? (???) <8853F0B7-8EE5-AD36-BC97-B0AD8782E547>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib
0x7f31000 – 0x7f57fe7 +libRIP.A.dylib
??? (???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libRIP.A.dylib
0x9cff000 – 0x9d3efe7 +TextInput ???
(???)

/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/PrivateFrameworks/TextInput.framework/TextInput
0x9d6a000 – 0x9eafff3
+libmecabra.dylib ??? (???) <1C45F15E-3F66-3F28-46C7-78EC4B63C803>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/usr/lib/libmecabra.dylib
0x9ee1000 – 0x9ff4ff7 +CoreData ???
(???)
<6F49CC28-8102-D224-EBBD-12045B6DBA92>
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.2.sdk/System/Library/Frameworks/CoreData.framework/CoreData
0x8fe00000 – 0x8fe4162b dyld 132.1
(???)
<211AF0DD-42D9-79C8-BB6A-1F4BEEF4B4AB>
/usr/lib/dyld 0x91fe7000 – 0x91feafe7
libmathCommon.A.dylib ??? (???)
<1622A54F-1A98-2CBE-B6A4-2122981A500E>
/usr/lib/system/libmathCommon.A.dylib
0x93497000 – 0x93501fe7
libstdc++.6.dylib ??? (???)
<411D87F4-B7E1-44EB-F201-F8B4F9227213>
/usr/lib/libstdc++.6.dylib 0x937b8000
– 0x9395cfeb libSystem.B.dylib ??? (???)

/usr/lib/libSystem.B.dylib 0x96692000
– 0x966d8ff7 libauto.dylib ??? (???) <85670A64-3B67-8162-D441-D8E0BE15CA94>
/usr/lib/libauto.dylib 0x9706e000 –
0x97082fe7 libbsm.0.dylib ??? (???)
<14CB053A-7C47-96DA-E415-0906BA1B78C9>
/usr/lib/libbsm.0.dylib 0x98055000 –
0x98102fe7 libobjc.A.dylib ??? (???)

/usr/lib/libobjc.A.dylib 0x98103000 –
0x981f7fe7 libiconv.2.dylib ??? (???)
<0C578460-3929-29DD-585A-DB1E0C977425>
/usr/lib/libiconv.2.dylib 0x98fd9000 –
0x98fe7fe7 libz.1.dylib ??? (???)
<7B7A02AB-DA99-6180-880E-D28E4F9AA8EB>
/usr/lib/libz.1.dylib 0xffff0000 –
0xffff1fff libSystem.B.dylib ???
(???)

/usr/lib/libSystem.B.dylib

Answer 1

This is wrong:

NSIndexPath *indexPath = [[NSIndexPath alloc] init];
indexPath = [self.categoryTableView indexPathForSelectedRow];

NSInteger selectedCategory = indexPath.row;
[indexPath release];

You’re instantiating an empty NSIndexPath and then overwriting the reference to it. The release on the last line is sent to an entirely different object returned by the table view. The object you create is never used and never released.

This will work:

NSIndexPath *indexPath = [self.categoryTableView indexPathForSelectedRow];
NSInteger selectedCategory = indexPath.row;

You’re not creating an NSIndexPath object, so you have no responsibility to release it.

(your unnecessary release is causing the index path instance to be prematurely deallocated. When Apple’s code tries to release the object, it no longer exists, and the app crashes)