Report the properties of the URL beforehand. At one case, I even had my old reporter get the properties, put them in a string and mail them to a specific email account to see what was going on.
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You can also log to a specific file on disk and then open that up and tail it from the terminal to get only your specific output written to that file and updated instantly on screen right before the crash.
On Apr 20, 2020, at 6:22 AM, John Brownie <firstname.lastname@example.org> wrote:
I am getting a crash, but only in the release version. I get a very helpful "Error 1" if I try to debug the release version, and logging doesn't get me anything, as the crash prevents the log entry from appearing (I think).
Anyway, the crash is in CFURLCreateWithFileSystemPath, where it's calling length, and I get crash reports like the following:
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler 
VM Regions Near 0x3eaddd9f4338:
MALLOC_LARGE_REUSABLE 0000000113885000-0000000114085000 [ 8192K] rw-/rwx SM=PRV
MALLOC_NANO 0000600000000000-0000600008000000 [128.0M] rw-/rwx SM=PRV
Application Specific Information:
objc_msgSend() selector name: length
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x00007fff6e14381d objc_msgSend + 29
1 com.apple.CoreFoundation 0x00007fff3544dfb5 _CFURLCreateWithFileSystemPath + 67
The VM Regions list can vary a bit, but it's always the same stack trace and signal.
It looks a bit weird that a Core Foundation function is trying to call an Objective-C method. Ironically, this crash is triggered when I'm attempting to show the user an error message, and the upstream call is essentially a call to get a localized version of a string.
Any pointers on how to debug this? How to get the debugger to connect with the release version? Or how to work out what is different between the release and debug versions that might be forcing the error?
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