CGContextDrawPDFPage Fails When Running from Xcode

The iOS app is creating a process to convert each page of a PDF file to UIImage.

Up to iOS7, the PDF page was successfully retrieved and converted using the code shown below.
When running in iOS 8.1, you get an unknown cause error during the CGContextDrawPDFPage stage.

The main codes are as follows:

NSURL*url=[NSURL fileURLWithPath:pdfPath];

CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL(__bridge CFURLRef)url);


CGPDFPageRef pageRef = CGPDFDocumentGetPage(pdf,1);
CGPDFPageRetain (pageRef);

CGRect pageRect = CGPDFPageGetBoxRect (pageRef, kCGPDFMediaBox);

UIGraphicsBeginImageContext (pageRect.size);

CGContextRefcontext=UIGraphicsGetCurrentContext();
CGContextSaveGState (context);

CGContextSetRGBFillColor (context, 1.0, 1.0, 1.0, 1.0);
CGContextFillRect (context, pageRect);
CGContextTranslateCTM (context, 0.0, pageRect.size.height);
CGContextScaleCTM (context, 1.0f, -1.0f);
CGContextSetInterpolationQuality (context, kCGInterpolationHigh);
CGContextSetRenderingIntent(context,kCGRenderingIntentDefault);

CGContextDrawPDFPage (context, pageRef);

CGContextRestoreGState (context);

UIImage* image=UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();
CGPDFPageRelease (pageRef);
CGPDFDocumentRelease (pdf);

Has there been a change in how CoreGraphics handles PDFs from iOS 8?
If you have any information about the cause or hint, please let me know.

In addition, iOS 8 also fails when running from Xcode, but
When I archive and install it on the actual machine with OTA, there are no errors and PDFs can be retrieved and converted successfully.

In other words,
·iOS 8 or higher
·Run from Xcode
·Error only in some PDFs
An error has occurred under the condition that

Regarding the phenomenon where there is a difference between running from Xcode and running from the actual machine alone,
If anyone has any knowledge,
Could you please let me know if it is not directly related to this phenomenon?