losetup --show -f -P images/... error different of partitions than expected 1

[thomastthai]

Overview of the Issue

When building with packer, I sometimes get the error error different of partitions than expected 1. This would happen randomly on additional runs of the same build that was previously successful and no changes made.

==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Image type: raspberrypi
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Retrieving Image
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Trying images/rpi-k3s-base-raspios-bookworm-armhf.img.gz
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Trying images/rpi-k3s-base-raspios-bookworm-armhf.img.gz?checksum=sha256%3A893a637a3d447974255a25242818ca66e5b37b31029488017f184cdb13a5e59c
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: images/rpi-k3s-base-raspios-bookworm-armhf.img.gz?checksum=sha256%3A893a637a3d447974255a25242818ca66e5b37b31029488017f184cdb13a5e59c => /vagrant/images/rpi-k3s-base-raspios-bookworm-armhf.img.gz
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Copying source image.
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Image is a gzip file.
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   24.74 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   36.63 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   29.80 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   33.50 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   33.45 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   28.26 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   35.50 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   32.91 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   26.81 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   22.51 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   19.27 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   37.09 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   38.07 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   43.50 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   27.95 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: Speed:   27.31 MB/s
    k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: mapping images/rpi-k3s-server-raspios-bookworm-armhf.img
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: losetup --show -f -P images/rpi-k3s-server-raspios-bookworm-armhf.img
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: partitions: [/dev/loop0p1]
==> k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf: error different of partitions than expected 1
Build 'k3s-server.arm-image.rpi-k3s-server-raspios-bookworm-armhf' errored after 1 minute 49 seconds: step canceled or halted

Reproduction Steps

sudo packer build -parallel-builds=1 ./packer/server-agent

Packer version

1.9.4

Simplified Packer Template

build.pkr.hcl

build {
  name = "k3s-server"

  source "source.arm-image.raspios_bookworm_armhf" {
    name = "rpi-k3s-server-raspios-bookworm-armhf"
    output_filename = "images/${source.name}.img"
  }

  source "source.arm-image.raspios_bookworm_arm64" {
    name = "rpi-k3s-server-raspios-bookworm-arm64"
    output_filename = "images/${source.name}.img"

  }

  provisioner "shell" {
    scripts = [
      "scripts/install-k3s-server.sh"
    ]
  }

  post-processors {
    post-processor "compress" {
      output = "images/${source.name}.img.gz"
    }
    post-processor "checksum" {
      checksum_types = ["sha256"]
      output = "images/${source.name}.img.gz.sha256"
    }
  }
}

build {
  name = "k3s-agent"

  source "source.arm-image.raspios_bookworm_armhf" {
    name = "rpi-k3s-agent-raspios-bookworm-armhf"
    output_filename = "images/${source.name}.img"
  }

  source "source.arm-image.raspios_bookworm_arm64" {
    name = "rpi-k3s-agent-raspios-bookworm-arm64"
    output_filename = "images/${source.name}.img"
  }

  provisioner "shell" {
    scripts = [
      "scripts/install-k3s-agent.sh"
    ]
  }

  post-processors {
    post-processor "compress" {
      output = "images/${source.name}.img.gz"
    }
    post-processor "checksum" {
      checksum_types = ["sha256"]
      output = "images/${source.name}.img.gz.sha256"
    }
  }

}

sources.pkr.hcl

source "arm-image" "raspios_bookworm_armhf" {

  image_type      = "raspberrypi"
  iso_url         = "images/rpi-k3s-base-raspios-bookworm-armhf.img.gz"
  iso_checksum    = "file:images/rpi-k3s-base-raspios-bookworm-armhf.img.gz.sha256"
}

source "arm-image" "raspios_bookworm_arm64" {
  image_type      = "raspberrypi"
  iso_url         = "images/rpi-k3s-base-raspios-bookworm-arm64.img.gz"
  iso_checksum    = "file:images/rpi-k3s-base-raspios-bookworm-arm64.img.gz.sha256"
  qemu_binary     = "qemu-aarch64-static"
}

plugins.pkr.hcl

packer {
  required_plugins {
    arm-image = {
      version = ">= 0.2.5"
      source  = "github.com/solo-io/arm-image"
    }
  }
}

Operating system and Environment details

Host machine: Windows 11 AMD64
Host machine terminal: Mintty via Git Bash
Guest VM: via Vagrant 2.4.0, VirtualBox 7.0, Debian 12