How to resolve malloc_error_break?

Question

I encounter this error with iOS 3.0 simulator, but not with simulators 3.1.3 and 3.2.

After creating a character breakpoint on malloc_error_break, I see this in the log:

[Session started at 2010-02-13 19:15:22 +0700.]
2010-02-13 19:15:24.405 iPortals[21656:207] bool for 1
iPortals(21656,0xa0089500) malloc: *** error for object 0x285e000: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
iPortals(21656,0xa0089500) malloc: *** error for object 0x2850000: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
iPortals(21656,0xa0089500) malloc: *** error for object 0x286c000: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
iPortals(21656,0xa0089500) malloc: *** error for object 0x287c000: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

here is my code

@implementation WebViewController

@synthesize myWebView;
@synthesize AppDelegate;
@synthesize mybanner;
@synthesize request;

- (void)dealloc
{
    //NSLog(@"WebViewController has been dealloc");
    myWebView.delegate = nil;
    self.myWebView = nil;
    [self.myWebView release];
    [super setView:nil];


    [myWebView release];
    myWebView = nil;
    request = nil;

    [mybanner release];
    [super dealloc];
}

- (void)setView:(UIView *)aView
{
    //NSLog(@"setView:(UIView *)aView");
    if (aView == nil) {
        self.myWebView = nil;
    }    
    [super setView:aView];
}

- (void)action {
    AppDelegate = nil;
    AppDelegate = [[UIApplication sharedApplication] delegate];
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:AppDelegate.PushLink]];
}

- (void)didReceiveMemoryWarning {

    //NSLog(@"didReceiveMemoryWarning: view = %@, superview = %@", [self valueForKey:@"_view"], [[self valueForKey:@"_view"] superview]);
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that not essential, such as cached data
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    //NSLog(@"viewDidLoad: view = %@", self.view);
    self.title = NSLocalizedString(@"iPortals", @"");


    //UIBarButtonItem *customItem = [[UIBarButtonItem alloc] initWithTitle:@"Item" style:UIBarButtonItemStyleBordered   target:self action:@selector(action];
    //self.navigationController.toolbar setItems: = [[UIBarButtonItem alloc] initWithTitle:@"[...]" style:UIBarButtonItemStyleBordered target:self action:@selector(action)];

    /*
    UIBarButtonItem *emailButton = [[UIBarButtonItem alloc]
                                    initWithImage:[UIImage imageNamed:@"icon.png"]
                                    style:UIBarButtonItemStylePlain target:self
                                    action:@selector(action)];
    self.toolbarItems = [NSArray arrayWithObjects:emailButton, nil];
    [emailButton release];
    //*/
    AppDelegate = nil;
    AppDelegate = [[UIApplication sharedApplication] delegate];

    //NSLog(@"777777777 %@",AppDelegate.PushLink);
    /*
    CGRect webFrame = [[UIScreen mainScreen] applicationFrame];
    webFrame.origin.y += kTopMargin + 5.0;  // leave from the URL input field and its label
    webFrame.size.height = 400;
    //webFrame.size.height -= 40.0;
    self.myWebView = nil;

    //*/
    //self.myWebView = [[[UIWebView alloc] initWithFrame:webFrame] autorelease];

    self.myWebView.backgroundColor = [UIColor grayColor];
    self.myWebView.scalesPageToFit = YES;
    self.myWebView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
    self.myWebView.delegate = self;

    [self.view addSubview: self.myWebView];
    self.mybanner.backgroundColor = [UIColor clearColor];
    [self.view addSubview: self.mybanner];

    /*
    CGRect textFieldFrame = CGRectMake(kLeftMargin, kTweenMargin,
                                       self.view.bounds.size.width - (kLeftMargin * 2.0), kTextFieldHeight);
    UITextField *urlField = [[UITextField alloc] initWithFrame:textFieldFrame];
    urlField.borderStyle = UITextBorderStyleBezel;
    urlField.textColor = [UIColor blackColor];
    urlField.delegate = self;
    urlField.placeholder = @"<enter a URL>";
    urlField.text = AppDelegate.PushLink;
    urlField.backgroundColor = [UIColor whiteColor];
    urlField.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    urlField.returnKeyType = UIReturnKeyGo;
    urlField.keyboardType = UIKeyboardTypeURL;  // this makes the keyboard more friendly for typing URLs
    urlField.autocapitalizationType = UITextAutocapitalizationTypeNone; // don't capitalize
    urlField.autocorrectionType = UITextAutocorrectionTypeNo;   // we don't like autocompletion while typing
    urlField.clearButtonMode = UITextFieldViewModeAlways;
    [urlField setAccessibilityLabel:NSLocalizedString(@"URLTextField", @"")];
    [self.view addSubview:urlField];
    [urlField release];
     */

    request = nil;
    request = [NSURLRequest requestWithURL:[NSURL URLWithString:AppDelegate.PushLink]
                               cachePolicy:NSURLRequestUseProtocolCachePolicy
                           timeoutInterval:60.0];
    [self.myWebView loadRequest:request];
}

// called after the view controller view is released and set to nil.
// For example, a memory warning which causes the view to be purged. Not invoked as a result of -dealloc.
// So release any properties that are loaded in viewDidLoad or can be recreated lazily.
//
- (void)viewDidUnload
{
    [super viewDidUnload];

    // release and set to nil

    [self.myWebView release];
    self.myWebView = nil;

}

-(BOOL)canBecomeFirstResponder {
    //NSLog(@"canBecomeFirstResponder ");
    return YES;
}

-(void)viewDidAppear:(BOOL)animated {
    //NSLog(@"viewDidAppear ");

    [self becomeFirstResponder];
}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    //NSLog(@"overrideoverrideoverrideoverrideoverrideoverrideoverrideoverride ");
    if ( event.subtype == UIEventSubtypeMotionShake )
    {
        // Put in code here to handle shake
        AppDelegate = nil;
        AppDelegate = [[UIApplication sharedApplication] delegate];
        [AppDelegate ToggleNavigationBar];
        [AppDelegate playsound:1];
        [self setAdHide:AppDelegate.toggle];

    }
}

- (void)setAdHide:(BOOL)hide {

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.6];
    if (!hide) {
        if (current == UIInterfaceOrientationLandscapeLeft || current == UIInterfaceOrientationLandscapeRight) {
            [mybanner setFrame:CGRectMake(0, 272, mybanner.frame.size.width, mybanner.frame.size.height)];
        }
        else {
            [mybanner setFrame:CGRectMake(0, 432, mybanner.frame.size.width, mybanner.frame.size.height)];
        }
    }
    else {
        [self restoreAd];
    }
    [UIView commitAnimations];

}

- (void)restoreAd {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.6];
    [mybanner setFrame:CGRectMake(0, 0, mybanner.frame.size.width, mybanner.frame.size.height)];    
    [UIView commitAnimations];
}

#pragma mark -
#pragma mark UIViewController delegate methods

- (void)viewWillAppear:(BOOL)animated
{
    self.myWebView.delegate = nil;
    self.myWebView.delegate = self; // setup the delegate as the web view is shown
}

- (void)viewWillDisappear:(BOOL)animated
{
    //[self.myWebView removeFromSuperview];
    [self.myWebView stopLoading];   // in case the web view is still loading its content
    self.myWebView.delegate = nil;  // disconnect the delegate as the webview is hidden
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{
    current = interfaceOrientation;
    [self restoreAd];
    return ((interfaceOrientation == UIInterfaceOrientationLandscapeLeft) || (interfaceOrientation == UIDeviceOrientationPortrait) ||
            (interfaceOrientation == UIInterfaceOrientationLandscapeRight));
}

// this helps dismiss the keyboard when the "Done" button is clicked
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    [self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[textField text]]]];

    return YES;
}


#pragma mark -
#pragma mark UIWebViewDelegate

- (void)webViewDidStartLoad:(UIWebView *)webView
{

    // starting the load, show the activity indicator in the status bar
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    // finished loading, hide the activity indicator in the status bar
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{

    // load error, hide the activity indicator in the status bar
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    // report the error inside the webview
    //NSString* errorString = [NSString stringWithFormat:
    //                       @"<html><center><font size=+5 color='red'>An error occurred:<br>%@</font></center></html>",
    //                       error.localizedDescription];
    //[self.myWebView loadHTMLString:errorString baseURL:nil];
    //URLCacheAlertWithError(error);
}

@end

Answer 1

Follow the recommendations in the log message: set a breakpoint in malloc_error_break. When the breakpoint fires, look at the backtracking in Xcode (or use the command bton the gdb command line) and see where you are calling free, or the API that uses free.

Xcode - " " Xcode.

Answer 2

, . dealloc [blah release]; viewDidUnload nil. .

- (void)dealloc
{
    [self.myWebView release];
    [mybanner release];
    [super dealloc];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    self.myWebView = nil;

}

, .

Answer 3

, .

• " " → " "
• .

I received this offer from Mac Terminal - an error occurred while sending a pointer freed when opening a terminal

In addition, I understand that the question is 6 years old, so it is unlikely that it will be useful for the original seeker. Hope this answer helps other people with similar errors.

Answer 4

Surprisingly, for me it decided to close and turn on the debugging device again. Oh Apple ...