Some users are unable to load dynamic libraries from frameworks

Question

Created Oct ’22

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I have apps that depend on loading dynamic libraries at runtime. It works for most users, but a small number of users are reporting issues. The dlopen() call fails with the following error message:

Failed loading awk from awk.framework/awk, cause = dlopen(awk.framework/awk, 0x0009): tried: '/private/var/containers/Bundle/Application/84E2C6C9-CCF1-4E92-9B4E-29557B0F9E
9E/a-Shell.app/Frameworks/awk.framework/awk' (could not register fairplay decryption, mremap_encrypted() => -1)

From the error message, dlopen() has found the dynamic library (awk.framework/awk), but failed to open it because of an issue with fairplay or mremap_encrypted().

I haven't found any documentation on the issue. Do you have any idea what is happening?

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Answer 1

DTS Engineer OP

Apple

Oct ’22

Some users are unable to load dynamic libraries from frameworks

What platform is this on?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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Answer 2

N. Holzschuch OP

Nov ’22

Oh, sorry, it's on iOS. I have reports of the issue occuring on iOS 15.7, 16 and 16.1. Re-installing the app usually fixes the problem.

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Answer 3

DTS Engineer OP

Apple

Nov ’22

Oh, sorry, it's on iOS.

OK. That radically reduces the scope for weirdness, at least compared to macOS.

I suspect that these folks are using a device with unsupported modifications (that is, jailbreaks). If you’re in touch with a user who’s having this problem, ask them about that. If that is the case, then Apple can’t really help them.

However, if that’s not the case then, yeah, this is a weird bug, and the next step would be to get a sysdiagnose log from the user, captured shortly after they’ve reproduced the problem.

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

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Answer 4

N. Holzschuch OP

Nov ’22

Thanks a lot for the feedback. I'll ask the question.

In case it's the latter, how do they "get a sysdiagnose log from the user"?

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Answer 5

N. Holzschuch OP

Nov ’22

I've received feedback from several users that their devices were never jailbroken.

So the next question is: how can they produce a useful diagnosis?

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Answer 6

DTS Engineer OP

Apple

Nov ’22

I've received feedback from several users that their devices were never jailbroken.

Well that’s good news.

how do they "get a sysdiagnose log from the user"?

Our Bug Reporting > Profiles and Logs page has info about that.

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

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Answer 7

N. Holzschuch OP

Nov ’22

One user has reported that the issue solved itself without action (which confirms it's a "weird bug", as you said). Another user has experienced the issue and managed to generate a sysdiagnose log (256 MB). What is the next step for me? Should I file an official bug report?

For orders of magnitude, I've had 5 different users reporting this issue over the past month for 10,000 installs. Assuming only one out of 10 users affected takes the time to raise a complaint (it's a free app), it happens roughly once every 200 installs.

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Answer 8

DTS Engineer OP

Apple

Nov ’22

What is the next step for me? Should I file an official bug report?

Probably.

Before doing that I have a quick question: This app is distributed via the App Store, right?

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

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Answer 9

N. Holzschuch OP

Nov ’22

It is, yes. It's named a-Shell and it weighs around 1.2 GB once expanded.

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Answer 10

DTS Engineer OP

Apple

Nov ’22

Hmmm, that’s an exciting product.

Given the nature of your product, I wonder if perhaps you’re running out of address space. When I user sees this problem, do they see it always? Or after using your app for a while?

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

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Answer 11

N. Holzschuch OP

Nov ’22

It is not a very common issue, so it's hard to infer things from a small sample size. But, from what I understand:

if it happens, it happens immediately after installation, for the first command.
rebooting does not help.
re-installing usually helps, but not always.
some users report that re-opening the app after a few days fixed the issue.

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Answer 12

DTS Engineer OP

Apple

Nov ’22

OK, that puts paid to my address space theory.

At this point my recommendation is that you file a bug about this, making sure to include the sysdiagnose log that you got from your customer.

Please post your bug number, just for the record.

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

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