Error trying to use ISO on SMB share: "Failed to get "consistent read" lock: Input/output error"

[AdamWill]

If I try to create a VM using an ISO on an SMB share (mounted at /mnt/data), it fails:

libvirt.libvirtError: internal error: QEMU unexpectedly closed the monitor (vm='bios1'): 2025-01-23T22:54:02.230636Z qemu-system-x86_64: -device {"driver":"ide-cd","bus":"ide.0","drive":"libvirt-1-storage","id":"sata0-0-0","bootindex":1}: Failed to get "consistent read" lock: Input/output error
Is another process using the image [/run/user/1000/doc/98240bae/Fedora-KDE-Desktop-Live-Rawhide-20250123.n.0.x86_64.iso]?

If I copy the ISO to my Downloads directory and use that, it works fine. I tried giving virt-manager read-only access to /mnt/data via flatseal, but it didn't help.

This works OK with the flathub Boxes flatpak, so it must be possible...

[tulilirockz]

Might be related to flathub/org.virt_manager.virt_manager.Extension.Qemu#4

[pm4rcin]

@AdamWill please post output of 2 commands:

1. getfacl /home/$USER
2. getfacl /mnt

It might be related to qemu user not having permission for directory traversal. I don't know how portals are supposed to work in such cases but it would be worth checking.

[AdamWill]

[root@omnibook tmp]# getfacl /home/adamw/
getfacl: Removing leading '/' from absolute path names
# file: home/adamw/
# owner: adamw
# group: adamw
user::rwx
group::---
other::---

[root@omnibook tmp]# getfacl /mnt
getfacl: Removing leading '/' from absolute path names
# file: mnt
# owner: root
# group: root
user::rwx
group::r-x
other::r-x