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POApp Crashes when NavigationController is popped!
 

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    <p>Below is what I copy/pasted from the Crash Log sent by the client. I am unable to understand what does that mean :s</p> <p>Apparently it looks like the app crashed when navigating back to a previous screen (and that's what client has reported). What is UIWebDocumentView here?</p> <p>I need to resolve the crash but I'm stuck here so any help is highly appreciated.</p> <p>P.S. I'm using iphone sdk 3.0.</p> <pre><code>Date/Time: 2009-09-29 18:16:28.458 -0400 OS Version: iPhone OS 3.0 (7A341) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0xbbadbeef Crashed Thread: 4 Thread 4 Crashed: 0 WebCore 0x3588dd74 __ZL17_WebTryThreadLockb + 288 1 WebCore 0x3588e4c0 __ZL18_WebThreadAutoLockv + 52 2 UIKit 0x30aea484 -[UIWebDocumentView _responderForBecomeFirstResponder] + 8 3 UIKit 0x30978b34 -[UINavigationTransitionView transition:fromView:toView:] + 200 4 UIKit 0x30978a54 -[UINavigationTransitionView transition:toView:] + 24 5 UIKit 0x30974470 -[UINavigationController _startTransition:fromViewController:toViewController:] + 1604 6 UIKit 0x30973d90 -[UINavigationController _startDeferredTransitionIfNeeded] + 256 7 UIKit 0x309a7468 -[UINavigationController _popViewControllerWithTransition:allowPoppingLast:] + 400 8 UIKit 0x309a72c8 -[UINavigationController popViewControllerAnimated:] + 32 9 Snocell 0x0002ae00 0x1000 + 171520 10 Foundation 0x30554062 -[NSThread main] + 42 11 Foundation 0x305023f2 __NSThread__main__ + 852 12 libSystem.B.dylib 0x31d705a0 _pthread_body + 20 </code></pre>
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    1. USImran Raheem
    1. USImran Raheem
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    1. COOk,i guess i found the solution. Sharing it in case someone drops here: EXC_BAD_ACCESS (SIGSEGV) KERN_INVALID_ADDRESS means that the virtual address you're refererencing is not in the page tables or you don't have access. It's a virtual address that you're not allowed to access. For your example address address 0x67696c69 it's likely that this is something that is not a pointer that was treated like a pointer; or your data structure that contains the pointer was free'd and overwritten with other data. And, then i see WebCore in the log, a component in iPhone WebKit (http://bit.ly/4j4WsN)
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      1. USImran Raheem
    2. COSo, what I was doing here, dispalying a website in UIWebView and before it could load completely, popping back to previous view controllers and it CRASHED. I found that UIWebView needs to have its delegate cleared before you release it; otherwise, if a web request completes after you release the UIWebView, it attempts to call back to the delegate and causes the application to crash. SOLUTION: I added "myWebView.delegate = nil;" before popping view controller and it's working now :)
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      1. USImran Raheem
    3. COI was having a similar problem -- webView.delegate = nil solved it, just like for you.
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      1. USChris Ladd
 

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