ssh connection timeout for packer build for qemu with most recent focal-server-cloudimg-amd64.img

[pfrydids]

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Overview of the Issue

packer build for qemu times out when trying to make ssh connection

Reproduction Steps

{
  "builders": [
    {
      "type": "qemu",
      "cpus": "{{user `builder_cpus`}}",
      "disk_cache": "directsync",
      "disk_discard": "ignore",
      "disk_image": true,
      "disk_interface": "virtio",
      "disk_size": "120G",
      "headless": true,
      "http_directory": "http",
      "iso_checksum": "file:https://cloud-images.ubuntu.com/focal/currentSHA256SUMS",
      "iso_url": "https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img",
      "memory": "{{user `builder_mem_mb`}}",
      "output_directory": "images",
      "qemuargs": [
        [
          "-smbios",
          "type=1,serial=ds=nocloud-net;instance-id=packer;seedfrom=http://{{ .HTTPIP }}:{{ .HTTPPort }}/"
        ]
      ],
      "skip_compaction": true,
      "ssh_password": "xxxxxxxxxx",
      "ssh_username": "packer",
      "ssh_timeout": "5m",
      "ssh_wait_timeout": "10m",
      "vm_name": "{{user `image_name`}}"
    }
}

Note that replacing

      "iso_checksum": "file:https://cloud-images.ubuntu.com/focal/current/SHA256SUMS",
      "iso_url": "https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img",

with

      "iso_checksum": "file:https://cloud-images.ubuntu.com/focal/20240220/SHA256SUMS",
      "iso_url": "https://cloud-images.ubuntu.com/focal/20240220/focal-server-cloudimg-amd64.img",

resolves the issue so it seems to have been introduced in the most recent cloud image build

Packer version

packer(1.10.1-1)

and

Packer v1.8.5 (local environment)

Operating system and Environment details

x64 0001-com-ubuntu-server-focal Canonical 20_04-lts-gen2 Canonical:0001-com-ubuntu-server-focal:20_04-lts-gen2:20.04.202402050 20.04.202402050

and

Ubuntu 20.04.6 LTS