Same issue for me Crashed Thread: 24 Dispatch queue: com.apple.root.utility-qos Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Application Specific Information: *** Terminating app due to uncaught exception 'NSFileHandleOperationException', reason: '*** -[NSConcreteFileHandle availableData]: Bad file descriptor' terminating with uncaught exception of type NSException abort() called macOS 11.4 Xcode 12.5.1

Also I'm wondering why we are setting pipe.fileHandleForWriting in process output instead of pipe.fileHandleForReading in case if we just reading ?

`/Users/vitaliikizlov/Desktop/Projects/MacOS/Mac/NordFS/nordfs.fs/Contents/Resources/mount_nordfs.app/Contents/Extensions/11/nordfs.kext

Also there is another problem that after code sign and success notarization through Xcode (I receive letter from Apple) framework still shows that it's not notarized. spctl -a -vv /Users/vitaliikizlov/Desktop/Projects/MacOS/Mac/NordFS/nordfs.fs/Contents/Resources/mount_nordfs.app /Users/vitaliikizlov/Desktop/Projects/MacOS/Mac/NordFS/nordfs.fs/Contents/Resources/mount_nordfs.app: rejected source=Unnotarized Developer ID

Also after some investigation I have this error: codesign -vvvv -R="notarized" --check-notarization /Users/vitaliikizlov/Desktop/Projects/MacOS/Mac/NordFS/nordfs.fs/Contents/Resources/mount_nordfs.app /Users/vitaliikizlov/Desktop/Projects/MacOS/Mac/NordFS/nordfs.fs/Contents/Resources/mount_nordfs.app: valid on disk /Users/vitaliikizlov/Desktop/Projects/MacOS/Mac/NordFS/nordfs.fs/Contents/Resources/mount_nordfs.app: satisfies its Designated Requirement test-requirement: code failed to satisfy specified code requirement(s)

Sorry, I've fixed everything. Problem was in incorrect codesign 🙂

Hey eskimo 🙂 Big thanks to your new solution 🙏 Maybe you can help me how to correctly add progress while child process is running ?