Created attachment 1749619 [details]
strace files for os-prober

Description of problem:

When running 'os-prober' or 'grub2-mkconfig' I get an error message from os-prober. It appears to be related to the existence of /srv being a subvolume...


Version-Release number of selected component (if applicable):
os-prober-1.77-6.fc33.x86_64

How reproducible:
Always on this one machine, another Fedora 33 system (but without Windows) doesn't have this problem.

Steps to Reproduce:
1. Run grub2-mkconfig or os-prober
2.
3.

Actual results:

# os-prober 
/dev/nvme0n1p2@/EFI/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
mount: /var/lib/os-prober/mount: mount(2) system call failed: No such file or directory.
[root@flap ~]# 



Expected results:

No error.


Additional info:


Curiously, while the error shows up with 'strace' without options, it's not found in any of the many files when I use 'strace -o osprober.txt -ff' but it did give me a clue. It looks like it's getting tripped up on /srv being a Btrfs subvolume. I have no idea why it's a Btrfs subvolume, that's not something I recall ever doing, but anyway, when I remove that subvolume and replace with a directory - the error no longer happens.