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[Simon Chopin <2121865@xxxxxxxxxxxxxxxxxx>]

** Tags added: dcr-incoming

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https://bugs.launchpad.net/bugs/2121865

Title:
  /lib/net-lib.sh shift count out of range errors

Status in dracut package in Ubuntu:
  New

Bug description:
  Launching a dracut-based Questing Quokka (Ubuntu 25.10) instance on
  Oracle Cloud boots fine, but the following error messages are observed
  during the boot process:

  [    2.248948] dracut-cmdline[185]: /lib/net-lib.sh: line 432: shift: shift count out of range
  [    2.251889] dracut-cmdline[185]: /lib/net-lib.sh: line 462: shift: shift count out of range

  The entire serial console can be observed here:
  https://pastebin.ubuntu.com/p/Zk55KqmfBg/

  In order to reproduce this issue, I'm using the following steps to
  switch from initramfs-tools to dracut:

  1. Install dracut:

  sudo apt update && sudo apt upgrade -y
  sudo apt install dracut-core dracut-network -y

  2. Change grub options (needed on Oracle for iscsi boot, but not
  relevant for this specific use case):

  sudo sed -i
  's|^GRUB_CMDLINE_LINUX_DEFAULT=.*|GRUB_CMDLINE_LINUX_DEFAULT="console=tty1
  console=ttyS0 nvme_core.shutdown_timeout=10 crash_kexec_post_notifiers
  rd.luks=0 rd.md=0 rd.dm=0 rd.net.timeout.carrier=5
  rd.iscsi.param=node.session.timeo.replacement_timeout=6000
  net.ifnames=1 ipmi_si.tryacpi=0 ipmi_si.trydmi=0
  libiscsi.debug_libiscsi_eh=1 rd.net.timeout.dhcp=10 ip=dhcp
  netroot=iscsi rd.iscsi.firmware=1"|' /etc/default/grub.d/50-cloudimg-
  settings.cfg

  3. Update grub:

  sudo update-grub

  4. Generate initrd with dracut:

  sudo dracut -f --regenerate-all

  5. Cleanup cloud-init config:

  sudo cloud-init clean -l --machine-id -s -c all

  6. Create an image on Oracle Cloud and launch an instance using this
  image. Observe the serial console during boot.

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