App compiled for 9.3.5 crashes on older iPad

Question

Created Mar ’20

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I have a newer iPad and an older iPad2. My app is written in Swift and compiled for 9.3.5, which is the OS installed on the older iPad2. ***My app runs fine in the simulator and on the newer iPad.*** On the older iPad2, a lot of mundane things work in the app, but it crashes with errors that are only semi-repeatable when I ask it to do its real work. The problem seems to have something to do with an object being garbage collected before it should be, but I am not sure that is really the problem, as the debugger sometimes gives other death messages that are completely different. Any ideas on this?

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Answer 1

KMT OP

Mar ’20

Is the crash only when running against the debugger?

What happens if you disconnect the device from your mac/Xcode, then close and reopen that app from there?

>...it crashes with errors

>...something to do with an object being garbage collected before it should be

>...sometimes gives other death messages that are completely different

When mentioning errors, do your best to share them. verbatim, thanks. Pls. do not post the entire dump unless requested. See:For Best Results - Read the Label

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Answer 2

DTS Engineer OP

Apple

Apr ’20

It’s very likely that you have a memory management bug that just happens to be exposed by this older OS release. I recommend that you apply the Standard Memory Debugging Tools, starting with zombies.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

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Answer 3

Hackito Ergo Sum OP

Dec ’20

And here is the problem: In iOS 9.3.5, subclass CALayer, then instantiate. Your app will crash. The subclass doesn't even need to have any instance variables or methods. Just define a subclass, then instantiate. Instant death. Looking a little farther into it, the subclass initializer immediately deallocates the instance. I asked Apple about this. They said they won't do anything about it.

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Answer 4

DTS Engineer OP

Apple

Dec ’20

In iOS 9.3.5, subclass CALayer, then instantiate.

Ah, this is the first time you’ve mentioned any involvement with CALayer. That is a known issue, and you can find a long discussion of it on this thread.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"

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