We are seeing this as well and seems to be happening on iOS 18.5 beta 1. Going to test on beta 3 asap. FB17176757

Found this msdos file system, but I wouldn't say it's extensively documented :)

I believe you could use: NSMorphology.userMorphology.grammaticalGender Note that you can only set gender through the system preferences if your primary language is a strongly gendered language (e.g. French), but once it is set you can switch back to English and it is still accessible. You can then see it using defaults read com.apple.morphology

Your problem is here: https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp#L991 Turns out that the sanitizers use puts to figure out if they have installed themselves early enough in the launch process. I was running into a similar issue except I was trying to override __sanitizer_report_error_summary which according to the headers I should be able to override. https://reviews.llvm.org/D144830

Sigh... ok so it turns out I forgot to mention that I was running my sample code from within Xcode, so the debugger was in play. Apparently having lldb in the mix messes with the signal handling (not a huge surprise, but still annoying). You are correct that it works fine without the debugger in the mix. I'll update the feedback accordingly. Thanks (somewhat embarrassed :) ) Dave

Here's another potential solution that is a simple command line app: https://github.com/dmaclach/crashdump