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Summary:
Using exlusionPaths on the textContainer property of UITextView leads to 100% CPU usage and huge amounts of used memory on iOS 7.1. The issue only seems to arise for certain UIBezierPath rects. In my case, the problem occurs when I create the  UIBezierPath with a CGRect whose origin.x is zero (i.e. settings the rect's origin.x to 1 fixes the issue). 

The problem does not exist on iOS 7.0

Steps to Reproduce:
1. Create a UITextView with some text
2. Create a UIBezierPath with a CGRect like CGRectMake(0, 0, 50, 50)
3. Set textView.textContainer.exclusionPaths array to include the UIBezierPath
4. Run the app

Expected Results:
The UITextView should render with a blank space in the (0, 0, 50, 50) rect and the App shouldn't hang or crash.

Actual Results:
The App hangs, CPU usage goes up to 100% and huge amounts (easily 1GB) of memory is used. After a few minutes the App crashes with malloc: *** mach_vm_map(size=1048576) failed (error code=3) *** error: can't allocate region

The problem is currently being discussed in the Apple Developer Forum at https://devforums.apple.com/message/960349#960349