[Virtio-fs] virtiofsd: doesn't garant write access at users allowed by group permission

[tecufanujacu at tutanota.com]

Hello to everyone,

I'm trying virtiofsd with proxmox from few weeks and I noticed a problem, virtiofsd doesn't garant write access at users allowed by group permission.

The virtiofsd bin included in proxmox is v 7.32, but I have also tested the bins compiled from source from stable branch (v7.27) and dev branch (v7.33), and I also have tested the bin virtiofsd-rs. Always same problem.

I opened an issue on gitlab and I asked in the proxmox forum but with almost zero interaction. Seems to me that virtiofsd isn't a lot used. Someone suggested me to write in the mailinglist for these technical things and here I am.

To better make understand what problem I'm noticing I link the issue opened in the gitlab in which I have reported a lot of useful info and logs with a good formatting:
https://gitlab.com/qemu-project/qemu/-/issues/368

To me seems really strange what is happening, am I doing some error or this really is a virtiofsd bug?
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