Did you find the root cause and/or a solution for the problem? I can't reproduce the issue myself, but we have users reporting freezes of our apps that might be related to this issue.

Also filed as FB17081255, including a sample project. Thanks for looking into this!

We are suddenly getting the same warning, and we are pretty sure that we (or any library) don't use said API. Are there any other APIs that trigger the warning? Was that list recently extended?

Did you always process the same image? How is your CIContext set up? Do you maybe have a small sample project we can use to test this? Thanks!

Is the DNG you are using for the warm-up one that was captured on iPhone? I.e., does it have the same dimensions as the ones captured by the user later?