[Bug 1673350] Re: dm-queue-length module is not included in installer/initramfs

[Mauricio Faria de Oliveira]

It's possible to reproduce this problem in a qemu-kvm guest,
with an emulated disk: force the queue-length path selector.

# name=mfo-1704
# disk=/var/lib/libvirt/images/$name.qcow2
# iso=/var/lib/libvirt/images/zesty-server-ppc64el.iso.2017-03-14

# qemu-img create -f qcow2 $disk 128g

# virt-install \
  --name $name \
  --cdrom $iso \
  --vcpus 8,sockets=1,cores=1,threads=8 \
  --memory 8192 \
  --controller type=scsi,model=virtio-scsi \
  --disk format=qcow2,path=$disk \
  --disk device=cdrom,readonly=true,path=$iso \
  --network bridge=virbr0,model=virtio

Before the disk-detection stage (e.g., set-up users and passwords),
Go Back, Execute a shell, and set up multipath.conf, and resume install:

~ # cat <<EOF >/etc/multipath.conf
defaults {
  path_selector "queue-length 0"
  user_friendly_names yes
  find_multipaths no
}
EOF

~ # exit

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https://bugs.launchpad.net/bugs/1673350

Title:
  dm-queue-length module is not included in installer/initramfs

Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  ---Problem Description---
  dm-queue-length module is not included in installer/initramfs

  On Ubuntu, multipath devices using the 'queue-length' path selector
  are non-functional on both the installer and initramfs environments;
  because the 'dm-queue-length' kernel module is not included in them.

  The multipath-modules.udeb (src:linux) does not include it in the installer,
  nor multipath-tools-boot (src:multipath-tools) installs it in the initramfs.

  One example is the EMC XtremIO storage, which has 'queue-length' defined as
  its path selector in the default multipath configuration, at least on 16.04.

  Other products may be affected if they are manually configured to use that
  path selector (e.g., via /etc/multipath.conf), and the mere switch of that
  might render the system _unbootable_ if booting from multipath, since the
  initramfs is affected.

  More recently this and another storage changed default path selectors out
  of 'queue-length', however, it's virtually possible for any storage system
  to be affected, with the described manual configuration change.  So, this
  change is also desired on for the next stable release, 17.04, and later.

  Patches are provided for 16.04 and 17.04.

  Error logs in LP comment #6.

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