reopen fd 8: permission denied: unknown

docker: Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: open sysctl net.ipv4.ip_unprivileged_port_start file: reopen fd 8: permission denied: unknown

Environment: Latest Docker CE on Debian 13 in Proxmox LXC container.

Workaround for Debian 13 (in LXC):

apt-get install containerd.io=1.7.28-1~debian.13~trixie

Solution (Proxmox host):

It is fixed in Proxmox 9.1 in lxc-pve version 6.0.5-2

apt install --only-upgrade lxc-pve

References:

• https://forums.docker.com/t/docker-fails-to-run-on-debian-bullseye-after-update-unable-to-start-container-process-error-during-container-init-open-sysctl-net-ipv4-ip-unprivileged-port-start-file-reopen-fd-8-permission-denied-unknown/150363
• https://forum.proxmox.com/threads/docker-inside-lxc-net-ipv4-ip_unprivileged_port_start-error.175437/page-2#post-814949