Trouble with GPG Cards for SSH when using FIDO2

[Philipp Schmidt]

Hello Everybody,

since some update, about 2 Month ago, I started to run into trouble using my both yubi Keys. To be precise: I have setup gpg such that the ssh auth Agent can access the keys. That worked for a long time. For example: `ssh-add -L` always displayed both public keys.
As mentioned before, now I am running into trouble, but not right from the start. As far as I could observe that, it happens always after I used one of the keys for a FIDO2 Authentification. After that `ssh-add -L` doesn't display any more keys and `gpg --card-status` says:

```
gpg: selecting card failed: No such device
gpg: OpenPGP card not available: No such device
```

event though the keys are inserted. In such a case, the only thing that helps is a reboot.

I really would like to provide more details, but I really do not know where to start.

Basiline:
- Everything works fine until I use one of the keys for FIDO2
- Afterwards I cannot restore the service without a reboot

I am running Arch Linux with a new Kernel and GPG version 2.4.3

Thanks in ahead for any help!


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