Grub-mkconfig never ends


I ran grub-mkconfig -o xxxxxxxx but broke in since I noticed I’d mis-typed the file name. I then corrected and ran again. It did the initial Fed entries, the memtest86+ one then posted several errors about os-probe cannot" umount /usr/libexec …still in use" or something.

I did ps ax and saw a zombie process still running, I hit it with kill -9.

I rebooted to get a clean start but now it just sits there dumbly after finding memtest86+ , it never terminates.

What is blocking this and how can I fix it?