If I understand it correctly the physical source-device has denied reading defect sectors which are inside the virtual disk.
The last resort would be to use a tool like
~$ apt show gddrescue
Package: gddrescue
Homepage...
I haven't come across this kvm warning with PVE as yet (upgrade path PVE7->8->9). But I have encountered it after upgrading a regular Debian 12 desktop to Debian 13. The machine was unsupported and qemu would not even start. The kvm guests...
Changing a kernel parameter resolved my issue, this is on some 15+ year old hardware.
Hardware: AMD SB700/SB800/SB900 AHCI (1002:4391)
Old kernel: 6.8.12-30-pve - hot-plug remove/insert works
New kernel: 7.0.14-4-pve - hot-plug removal and...
"kvm: warning: Machine type 'pc-i440fx-5.1' is deprecated: old machine version is subject to deletion during current major Proxmox VE release
WARN: current machine version 'pc-i440fx-5.1+pve0' is deprecated - see the documentation and change to a...