IOHIDManagerScheduleWithRunLoop internal assertion post Catalina

our [macOS] project calls to IOHIDManagerScheduleWithRunLoop trigger an internal assertion

Can you post an Apple crash report for this? You’ll need you to run your code outside of the debugger to generate one. Oh, and use the text attachment feature (click the paperclip icon and then choose Add File) to avoid clogging up the timeline.

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

Hi @eskimo, Thanks for the reply. I have attached the crash report. Best, Stephane

Consider this snippet from the crashing thread’s backtrace:

5 com.apple.framework.IOKit   IOHIDManagerScheduleWithRunLoop + 302
6 com.interplay.darkalliance  JBE::InputPF::InitGamePad() + 822 (input_pf.cpp:666)

You can find the source for IOHIDManagerScheduleWithRunLoop in Darwin. Right at the start of that routine you’ll find this:

os_assert(!manager->runLoop && !manager->dispatchQueue,
          "Schedule failed queue: %p runLoop: %p", manager->dispatchQueue, manager->runLoop);

This is the assert you’re tripping. That routine is called by your code so you should look at JBE::InputPF::InitGamePad() to see how it might have called IOHIDManagerScheduleWithRunLoop twice on the same manager.

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

Thank you so much @eskimo, that source link and know what was the triggering condition was greatly helpful. I assume a new condition check that's just come up in Catalina. Much appreciate your help here.