为什么CGPathRelease导致内存泄漏？

Question

当我尝试释放路径时，它将导致大约5兆字节的内存泄漏。每当我调用CGreleasePath时，ram内存使用量将再次增加5兆字节。可能是导致此内存泄漏的原因是什么？

这是我的所有路径都被使用的代码：

    //viewcontroller.h
        CGMutablePathRef path;

        //viewcontroller.m

        -(void)viewDidLoad{
    path = CGPathCreateMutable;
    timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(movement1) userInfo:nil repeats:YES];
    timer2 = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(motor) userInfo:nil repeats:YES];
    }

    -(void)movement1{
            CGPathMoveToPoint(path, NULL, greentmporary.x, greentmporary.y);
            CGPathAddLineToPoint(path, NULL, greenpoint1.x, greenpoint1.y);
    }

    -(void)motor{
CGPathRef thickpath = NULL;
    thickpath = CGPathCreateCopyByStrokingPath(path, NULL, (6+bigsizeYellow), kCGLineCapSquare, kCGLineJoinMiter, 0);

            if (CGPathContainsPoint(thickpath, NULL, greenpoint1, NO) && krockamedgreen == NO) {
                NSLog(@"YES");
[self reset]
    }

          if (CGPathContainsPoint(thickpath, NULL, point1, NO) && krockamedgreen == NO) {
                NSLog(@"YES");
[self reset]
    }

         if (thickpath) {
                CFRelease(thickpath);
                thickpath = NULL;
            }

    }

-(void)reset{
    path = NULL;
}
 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
//start again
{
path = CGPathCreateMutable;
}