general io error: Invalid argument (os error 22)

Hi,

can't mount webdav:

mount.davfs -o uid=hadmut,gid=hadmut,username=u500950-sub1 https://u500950-sub1.your-storagebox.de/ /tmp/aaa

seems to work, password is correct (there's an error message if I test with a wrong password).

but

# dir /tmp/aaa
ls: general io error: Invalid argument (os error 22)
total 0

It seems to be a bug that came in with Ubuntu 25.10. I have reported this upstream yesterday, and someone else had the same problem with a different server, since 25.10:

https://github.com/alisarctl/davfs2/issues/23

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: davfs2 1.7.1-1
ProcVersionSignature: Ubuntu 6.17.0-5.5-generic 6.17.0-rc7
Uname: Linux 6.17.0-5-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Tue Oct 21 00:00:24 2025
InstallationDate: Installed on 2025-10-19 (1 days ago)
InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
SourcePackage: davfs2
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.davfs2.secrets: [inaccessible: [Errno 13] Permission denied: '/etc/davfs2/secrets']