We are experiencing a segmentation fault crash when running our tests on AWS Device Farm. This crash only happens on iOS 18 and does not happen on iOS 26 also running on device farm.
We have not been able to replicate this crash locally and we have not seen this in any of our production app usage.
It appears there is some memory corruption going on and the trace always seems to crash inside Apple's UIKit code with -[UIImageSymbolConfiguration _initWithTraitCollection:].
I also see the following in the logs from CI: [TraitCollection] Class CKBrowserSwitcherViewController overrides the -traitCollection getter, which is not supported. If you're trying to override traits, you must use the appropriate API.
We are not overriding traitCollection getter anywhere in our code and we have no usage of CKBrowserSwitcherViewController either. This crash happens when trying to go through the login flow to our app when KIF hits the login button.
I have tried debugging with Zombies and the memory graph debugger but nothing is sticking out as to what would be causing this issue. When running locally with Zombies I do not get any memory warnings going through our login flow.
Could this be a bug inside of UIKit on iOS18 which is getting exposed due to timing on AWS? Any help with next debugging steps would be appreciated.