EXC_BAD_ACCESS issue on iphone and simulator - iphone

Question

I am getting an EXC_BAD_ACCESS out side of my own code. Currently my code gets a URL through a shareURLCache object and then starts url connection. Once I leave the method that starts the url connection I hit the EXC_BAD_ACCESS. I have tried using instruments to find any zombies and I have analysed for memory leaks and not turned up either. At this point I am completely stuck.
Here is the code that loads the url and starts the url connection
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
NSLog(#"At new location: %#",newLocation);
MKCoordinateRegion region =
MKCoordinateRegionMakeWithDistance([newLocation coordinate], 750, 750);
[mapView setRegion:region animated:YES];
[location stopUpdatingLocation];
CLLocationCoordinate2D coord = [newLocation coordinate];
NSURL *url = [urlCache getReccomendationForUID:#"12345" atLat:coord.latitude
atLon:coord.longitude forCategories:nil];
// Create the request.
NSURLRequest *request = [NSURLRequest requestWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// create the connection with the request
// and start loading the data
connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
if (connection) {
// Create the NSMutableData to hold the received data.
// xmlData is an instance variable declared elsewhere.
xmlData = [[NSMutableData alloc]init];
} else {
NSLog(#"Could not create connection");
}
}
Method from the sharedURLCache that returns the url
-(NSURL *)getReccomendationForUID:(NSString *)u atLat:(double)lat atLon:(double)lon forCategories:(NSArray *)cat
{
if(remote) {
NSMutableString *categories = [[NSMutableString alloc]init];
for(NSString *s in cat) {
[categories appendString:#"&cat="];
[categories appendString:s];
}
NSString *s = [NSString stringWithFormat:#"%#/recommendation?uid=%#&psw=null&lat=%f&lon=%f?%#",
apiRoot,u,lat,lon,categories];
[categories release];
return [NSURL URLWithString:s];
} else {
return [[NSBundle mainBundle] URLForResource:#"XMLTest" withExtension:#"xml"];;
}
}

Answer 1

Just start by commenting out code and running to see if you can get the mem error to disappear then start adding code again until it appears, then you have a better idea where the issue is. it could be anywhere in your code since you seem to have a number of objects in there that are not passed in e.g. 'location'.
[location stopUpdatingLocation];

Answer 2

I had same memory issue with
[mapView setRegion:region animated:YES];
This method doesn't like fast updates...