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

[Mauricio Faria de Oliveira]

Error logs:
----------

This error log is seen in the installer, and multipath devices are not
created for such storage system:

...
Mar 14 06:41:54 kernel: [ 0.000000] Kernel command line: tasks=standard pkgsel/language-pack-patterns= pkgsel/install-language-support=false --- quiet /install disk-detect/multipath/enable=true
...
Mar 14 06:47:09 main-menu[3743]: INFO: Menu item 'disk-detect' selected
...
Mar 14 06:47:14 anna-install: Installing multipath-udeb
...
Mar 14 06:47:16 kernel: [ 324.968027] device-mapper: table: 252:0: multipath: unknown path selector type
Mar 14 06:47:16 kernel: [ 324.968030] device-mapper: ioctl: error adding target to table
...
Mar 14 06:47:17 kernel: [ 326.484059] device-mapper: table: 252:0: multipath: unknown path selector type
Mar 14 06:47:17 kernel: [ 326.484062] device-mapper: ioctl: error adding target to table
Mar 14 06:47:17 disk-detect: Mar 14 06:47:16 | mpatha: ignoring map
...
Mar 14 06:47:17 disk-detect: Mar 14 06:47:17 | mpathg: ignoring map
Mar 14 06:47:18 disk-detect: No multipath devices detected

And after installing the system in an individual/single path device,
and trying to switch to multipath via multipath-tools-boot, it also
happens in the initramfs:

Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... Begin: Waiting for udev to settle (multipath) ... done.
[ 89.709480] device-mapper: table: 252:0: multipath: unknown path selector type
[ 89.709537] device-mapper: ioctl: error adding target to table
[ 89.756251] device-mapper: table: 252:0: multipath: unknown path selector type
[ 89.837132] device-mapper: ioctl: error adding target to table
[ 89.912346] device-mapper: table: 252:0: multipath: unknown path selector type
[ 90.001719] device-mapper: ioctl: error adding target to table
[ 90.300203] device-mapper: table: 252:0: multipath: unknown path selector type
[ 90.303521] device-mapper: ioctl: error adding target to table
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
...
Begin: Running /scripts/local-block ... done.
done.

Gave up waiting for root device. Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (did the system wait long enough?)
   - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT! UUID=0568fc48-2921-4ba2-b1b5-127c1d5a310e does not exist. Dropping to a shell!

BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

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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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