UITableView crash when selecting - iphone

Question

I have a simple table view controller driven by the fetchedResultsController and it crashes very often when I select it and the crash log is like this;
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0xc21eb7ad
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libobjc.A.dylib 0x3c0ce5d0 objc_msgSend + 16
1 UIKit 0x3623c564 -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 404
2 UIKit 0x3622138c -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1312
3 UIKit 0x36238822 -[UITableView layoutSubviews] + 202
4 UIKit 0x361f48c2 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 254
5 QuartzCore 0x35fa050e -[CALayer layoutSublayers] + 210
6 QuartzCore 0x35fa00b0 CA::Layer::layout_if_needed(CA::Transaction*) + 456
7 QuartzCore 0x35fa0fd4 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 12
8 QuartzCore 0x35fa09be CA::Context::commit_transaction(CA::Transaction*) + 234
9 QuartzCore 0x35fa07d0 CA::Transaction::commit() + 312
10 QuartzCore 0x35fa0634 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 56
11 CoreFoundation 0x343b793e __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
12 CoreFoundation 0x343b5c34 __CFRunLoopDoObservers + 272
13 CoreFoundation 0x343b5f8e __CFRunLoopRun + 742
14 CoreFoundation 0x34329238 CFRunLoopRunSpecific + 352
15 CoreFoundation 0x343290c4 CFRunLoopRunInMode + 100
16 GraphicsServices 0x37f07336 GSEventRunModal + 70
17 UIKit 0x362452b4 UIApplicationMain + 1116
18 Introdex 0x0011e538 0xa3000 + 505144
19 Introdex 0x000a5a24 0xa3000 + 10788
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x3c5b75d0 kevent64 + 24
1 libdispatch.dylib 0x3c4f2d22 _dispatch_mgr_invoke + 806
2 libdispatch.dylib 0x3c4ee374 _dispatch_mgr_thread + 32
Thread 2 name: WebThread
Thread 2:
0 libsystem_kernel.dylib 0x3c5b6e30 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3c5b6fd0 mach_msg + 48
2 CoreFoundation 0x343b72b6 __CFRunLoopServiceMachPort + 126
3 CoreFoundation 0x343b602c __CFRunLoopRun + 900
4 CoreFoundation 0x34329238 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x343290c4 CFRunLoopRunInMode + 100
6 WebCore 0x3a328390 RunWebThread(void*) + 440
7 libsystem_c.dylib 0x3c5200de _pthread_start + 306
8 libsystem_c.dylib 0x3c51ffa4 thread_start + 4
Thread 3:
0 libsystem_kernel.dylib 0x3c5b6e30 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3c5b6fd0 mach_msg + 48
2 CoreFoundation 0x343b72b6 __CFRunLoopServiceMachPort + 126
3 CoreFoundation 0x343b602c __CFRunLoopRun + 900
4 CoreFoundation 0x34329238 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x343290c4 CFRunLoopRunInMode + 100
6 Foundation 0x34c4d5be -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 250
7 Foundation 0x34cf0c40 -[NSRunLoop(NSRunLoop) run] + 76
8 Introdex 0x0021924c 0xa3000 + 1532492
9 Foundation 0x34cfa22c __NSThread__main__ + 968
10 libsystem_c.dylib 0x3c5200de _pthread_start + 306
11 libsystem_c.dylib 0x3c51ffa4 thread_start + 4
Thread 4 name: com.apple.NSURLConnectionLoader
Thread 4:
0 libsystem_kernel.dylib 0x3c5b6e30 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3c5b6fd0 mach_msg + 48
2 CoreFoundation 0x343b72b6 __CFRunLoopServiceMachPort + 126
3 CoreFoundation 0x343b602c __CFRunLoopRun + 900
4 CoreFoundation 0x34329238 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x343290c4 CFRunLoopRunInMode + 100
6 Foundation 0x34c76888 +[NSURLConnection(Loader) _resourceLoadLoop:] + 304
7 Foundation 0x34cfa22c __NSThread__main__ + 968
8 libsystem_c.dylib 0x3c5200de _pthread_start + 306
9 libsystem_c.dylib 0x3c51ffa4 thread_start + 4
Thread 5 name: com.apple.CFSocket.private
Thread 5:
0 libsystem_kernel.dylib 0x3c5c7594 __select + 20
1 CoreFoundation 0x343bb474 __CFSocketManager + 676
2 libsystem_c.dylib 0x3c5200de _pthread_start + 306
3 libsystem_c.dylib 0x3c51ffa4 thread_start + 4
Thread 6 name: JavaScriptCore::BlockFree
Thread 6:
0 libsystem_kernel.dylib 0x3c5c708c __psynch_cvwait + 24
1 libsystem_c.dylib 0x3c518afc _pthread_cond_wait + 644
2 libsystem_c.dylib 0x3c518870 pthread_cond_timedwait + 40
3 JavaScriptCore 0x382fddf6 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 102
4 JavaScriptCore 0x38410532 JSC::BlockAllocator::blockFreeingThreadMain() + 78
5 JavaScriptCore 0x38423030 WTF::wtfThreadEntryPoint(void*) + 12
6 libsystem_c.dylib 0x3c5200de _pthread_start + 306
7 libsystem_c.dylib 0x3c51ffa4 thread_start + 4
Thread 7 name: JavaScriptCore::Marking
Thread 7:
0 libsystem_kernel.dylib 0x3c5c708c __psynch_cvwait + 24
1 libsystem_c.dylib 0x3c518afc _pthread_cond_wait + 644
2 libsystem_c.dylib 0x3c522cf8 pthread_cond_wait + 36
3 JavaScriptCore 0x383a36dc JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 140
4 JavaScriptCore 0x383a3620 JSC::MarkStackThreadSharedData::markingThreadMain() + 140
5 JavaScriptCore 0x38423030 WTF::wtfThreadEntryPoint(void*) + 12
6 libsystem_c.dylib 0x3c5200de _pthread_start + 306
7 libsystem_c.dylib
Can somebody please explain me what this crash log means. I could not read it properly and do not know what this actually means. It would be really great if anyone could help me.

Answer 1

Without looking at your code, its hard to know where you going wrong.
But still as I know If you are able show the data on Table successfully and getting crash while click on particular row.
Below are some possibilities.
1). make sure you have declared UITableViewDelegate in your controller's header file.
Solution : make sure you have this (in .h file)
#interface FavViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
2). forgot to hook-up delegate with File owner
Solution : Open Layout's XIB file --> select UITableView --> in Connection Inspector --> drag delegate to the File's Owner (as per the below image)
you can achieve same by doing it programmatically in your .m file's viewDidLoad method
favourite_tbl.delegate=self;//favourite_tbl is instance of myTableView
3). your didSelectRowAtIndexPath method (for click on row) should be like
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
selectedIndex = indexPath.row;
NSLog(#"you have selected %d",selectedIndex);
}
Feel free to drop me a comment if you have any trouble in this.