Packer - can't lock file '/var/lock/qemu-server/lock-

[SteDec]

Hi everyone !

I' ve issues with packer and my proxmox cluster.

I would like create a Rocky Linux 9.4 template for starting. After that the idea is to use Terraform with this template.
I'm stuck on packer step.
This is the permissions through my token

pveum acl list | grep -i "packergrp"
/      | Administrator | group | packergrp | 1 |

My packer version

packer --version
Packer v1.11.2

Packer use the token for user "packer" who is member of "packergrp" .
This is my hcl code

packer {
  required_plugins {
    proxmox = {
      version = ">= 1.2.1"
      source  = "github.com/hashicorp/proxmox"
    }
  }
}

variable "proxmox_api_url" {
  type = string
}

variable "proxmox_api_token_id" {
  type = string
}

variable "proxmox_api_token_secret" {
  type = string
  sensitive = true
}

variable "ssh_username" {
  type = string
}

variable "ssh_password" {
  type = string
}



source "proxmox" "rocky-linux" {
  proxmox_url               = "${var.proxmox_api_url}"
  username                  = "${var.proxmox_api_token_id}"
  token                     = "${var.proxmox_api_token_secret}"
  insecure_skip_tls_verify  = true

  node                      = "proxmoxve"
  vm_name                   = "rocky-linux-with-ks"
  template_description      = "Rocky Linux avec KS.cfg"

  iso_file                  = "local:iso/Rocky-9.4-x86_64-minimal.iso"
  iso_storage_pool          = "local"
  unmount_iso               = true
  qemu_agent                = true

  scsi_controller           = "virtio-scsi-single"
  cores                     = "4"
  sockets                   = "2"
  memory                    = "4096"

  cpu_type                  = "host"    # CPU type host
  bios                      = "seabios" # SeaBIOS

  disks {
    disk_size               = "20G"
    format                  = "raw"
    storage_pool            = "local-lvm"
    type                    = "scsi"
    io_thread                = true  
  }

  network_adapters {
    model                   = "virtio"
    bridge                  = "vmbr0"
    firewall                = "false"
  }

  boot_command = [  
    "<tab><bs><bs><bs><bs><bs>text nomodeset noapic acpi=off inst.ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/ks.cfg<enter><wait>"
  ]
#"boot_command": "<tab> inst.text inst.ks=https://raw.githubusercontent.com/xxx/xxx/xxx/centos-7.cfg <enter><wait>",
  boot                      = "c"
  boot_wait                 = "15s"
  communicator              = "ssh"

  http_directory            = "./http"  
  http_port_min             = 8098
  http_port_max             = 8098

  ssh_username              = "${var.ssh_username}"
  ssh_password              = "${var.ssh_password}"

  ssh_timeout               = "30m"
  ssh_pty                   = true
  ssh_handshake_attempts    = 15
}

build {
  name    = "rocky-linux-with-ks"
  sources = [
    "source.proxmox.rocky-linux"
  ]
}

I've my kickstart file in http dir and my variables.pkvars.hcl.
Everything is fine exept at the end, especially on stopping VM for create the template.

On pve side I've this

trying to acquire lock...
TASK ERROR: can't lock file '/var/lock/qemu-server/lock-104.conf' - got timeout

and on packer side

rocky-linux-with-ks.proxmox.rocky-linux: output will be in this color.

==> rocky-linux-with-ks.proxmox.rocky-linux: Creating VM
==> rocky-linux-with-ks.proxmox.rocky-linux: No VM ID given, getting next free from Proxmox
==> rocky-linux-with-ks.proxmox.rocky-linux: Starting VM
==> rocky-linux-with-ks.proxmox.rocky-linux: Starting HTTP server on port 8098
==> rocky-linux-with-ks.proxmox.rocky-linux: Waiting 15s for boot
==> rocky-linux-with-ks.proxmox.rocky-linux: Typing the boot command
==> rocky-linux-with-ks.proxmox.rocky-linux: Waiting for SSH to become available...
==> rocky-linux-with-ks.proxmox.rocky-linux: Connected to SSH!
==> rocky-linux-with-ks.proxmox.rocky-linux: Stopping VM
==> rocky-linux-with-ks.proxmox.rocky-linux: Error converting VM to template, could not stop: VM quit/powerdown failed
==> rocky-linux-with-ks.proxmox.rocky-linux: Provisioning step had errors: Running the cleanup provisioner, if present...
==> rocky-linux-with-ks.proxmox.rocky-linux: Stopping VM
==> rocky-linux-with-ks.proxmox.rocky-linux: Deleting VM
Build 'rocky-linux-with-ks.proxmox.rocky-linux' errored after 8 minutes 13 seconds: Error converting VM to template, could not stop: VM quit/powerdown failed

I tried

1. To use a different id : same issue
2. To update my repo on packer : same
3. When I tested the code, I had some issues and I stopped many time the code ( CTRL + C ) and the machines have been poweroff, even if my linux work .

I think the problem is on the templating phase.
I check the new version of code here : https://github.com/hashicorp/packer-plugin-proxmox/blob/main/docs/builders/iso.mdx . But elements are missing ( like
iso_storage_pool , umount_iso ... )
Do you have any ideas please ?