unrecognized selector sent to instance. Method being called for random objects
<p>Ok, so this has me completely stumped just like the guy <a href="http://www.iphonedevsdk.com/forum/iphone-sdk-development/56974-some-object-numberofsectionsintableview.html" rel="nofollow">here</a> with the exact problem.</p>

<p>I have a <code>UITableView</code> with some rows in a view controller which supports autorotation and sometimes, if i rotate the phone, i get "EXC_BAD_ACCESS" and sometimes i get SIGABRT with a stack trace like:</p>

<pre><code>2010-11-19 16:51:05.634 [2306:307] -[CABasicAnimation numberOfSectionsInTableView:]: unrecognized selector sent to instance 0x58207d0
2010-11-19 16:51:05.688 [2306:307] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CABasicAnimation numberOfSectionsInTableView:]: unrecognized selector sent to instance 0x58207d0'
*** Call stack at first throw:
(
 0   CoreFoundation                      0x344aaed3 __exceptionPreprocess + 114
 1   libobjc.A.dylib                     0x33975811 objc_exception_throw + 24
 2   CoreFoundation                      0x344ac683 -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
 3   CoreFoundation                      0x344541d9 ___forwarding___ + 508
 4   CoreFoundation                      0x34453f90 _CF_forwarding_prep_0 + 48
 5   UIKit                               0x31b20717 -[UITableViewRowData(UITableViewRowDataPrivate) _updateNumSections] + 66
 6   UIKit                               0x31b20677 -[UITableViewRowData invalidateAllSections] + 50
 7   UIKit                               0x31b2048d -[UITableView(_UITableViewPrivate) _updateRowData] + 64
 8   UIKit                               0x31b22941 -[UITableView(_UITableViewPrivate) _ensureRowDataIsLoaded] + 24
 9   UIKit                               0x31b22909 -[UITableView numberOfSections] + 16
 10  UIKit                               0x31bd114f -[UISearchDisplayController _updateNoSearchResultsMessageVisiblity] + 54
 11  UIKit                               0x31cfbef7 -[UISearchDisplayController windowWillAnimateRotation:] + 478
 12  Foundation                          0x3325d6b3 _nsnote_callback + 142
 13  CoreFoundation                      0x34431713 __CFXNotificationPost_old + 402
 14  CoreFoundation                      0x344313b3 _CFXNotificationPostNotification + 118
 15  Foundation                          0x3324cdb7 -[NSNotificationCenter postNotificationName:object:userInfo:] + 70
 16  UIKit                               0x31b5dbb7 -[UIWindow _setRotatableClient:toOrientation:duration:force:] + 3114
 17  UIKit                               0x31b64013 -[UIWindow _setRotatableViewOrientation:duration:force:] + 50
 18  UIKit                               0x31b39a0f -[UIWindow _updateToInterfaceOrientation:duration:force:] + 74
 19  UIKit                               0x31b39be9 -[UIWindow _updateInterfaceOrientationFromDeviceOrientation:] + 112
 20  UIKit                               0x31b39b15 -[UIWindow _handleDeviceOrientationChange:] + 88
 21  Foundation                          0x3325d6b3 _nsnote_callback + 142
 22  CoreFoundation                      0x34431713 __CFXNotificationPost_old + 402
 23  CoreFoundation                      0x344313b3 _CFXNotificationPostNotification + 118
 24  Foundation                          0x3324cdb7 -[NSNotificationCenter postNotificationName:object:userInfo:] + 70
 25  UIKit                               0x31b0d0ed -[UIDevice setOrientation:animated:] + 144
 26  UIKit                               0x31b2a51b -[UIApplication handleEvent:withNewEvent:] + 2738
 27  UIKit                               0x31b29901 -[UIApplication sendEvent:] + 44
 28  UIKit                               0x31b29337 _UIApplicationHandleEvent + 5110
 29  GraphicsServices                    0x3026c04b PurpleEventCallback + 666
 30  CoreFoundation                      0x3443fce3 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
 31  CoreFoundation                      0x3443fca7 __CFRunLoopDoSource1 + 166
 32  CoreFoundation                      0x3443256d __CFRunLoopRun + 520
 33  CoreFoundation                      0x34432277 CFRunLoopRunSpecific + 230
 34  CoreFoundation                      0x3443217f CFRunLoopRunInMode + 58
 35  GraphicsServices                    0x3026b5f3 GSEventRunModal + 114
 36  GraphicsServices                    0x3026b69f GSEventRun + 62
 37  UIKit                               0x31ad0123 -[UIApplication _run] + 402
 38  UIKit                               0x31ace12f UIApplicationMain + 670
 39  App                                 0x0000285f main + 70
 40  App                            0x00002814 start + 40
)
terminate called after throwing an instance of 'NSException'
Program received signal:  “SIGABRT”.
</code></pre>

<p>In this case it is <code>CABasicAnimation</code> on which <code>numberOfSectionsInTableView</code> is being called but sometimes there are class names like <code>NSMachPort</code> which i have never heard of. Also, the method being called <code>numberOfSectionsInTableView</code> remains the same with the class names changing to always give a <code>doesNotRecognizeSelector</code> exception.</p>

<p>Also this problem only happens when i try to rotate the device. Whenever i get a stack trace like above, there are all system functions which makes it difficult to debug.</p>

<p>Really need some expert advice on this. Please read the forum mentioned above to be clear about the issue.</p>
