Open Radar

 
Summary:
If you add a keyframe animation using addKeyframeWithRelativeStartTime to a UIView that implements drawRect and then immediately remove that view from its superview, memory is leaked proportionally to the size of the view. The memory being leaked follows:

#	Address	Category	Timestamp	Live	Size	Responsible Library	Responsible Caller
0	0x10ffbd000	VM: CoreAnimation	00:38.965.672	•	2.93 MB	QuartzCore	CA::Render::Shmem::new_shmem(unsigned long)

Steps to Reproduce:
While instrumenting for memory allocations:

1. Create a UIView subclass.
2. Implement drawRect: with { [super drawRect:rect]; }
3. Create an instance of the UIView subclass.
3. Within a UIView::animateKeyframesWithDuration animation block, animate the view's alpha within a UIView::addKeyframeWithRelativeStartTime block.
4. Immediately call [view removeFromSuperView];

Expected Results:
Nearly all memory for the view to be released back to the system.

Actual Results:
Memory proportional to the size of the view is leaked permanently.

Version:
iOS 8.3, 8.4, 9.0

Configuration:
iPhone 6, iOS simulator

Example: https://gist.github.com/jverkoey/863ba4df71ca477249a4