Comment 15 for bug 1432062

Marking as verification-done.

Details:
-------

qemu-kvm guest w/ rootfs on multipath

 # mount | grep ' / '
 /dev/mapper/mauricfo4--vg-root on / type ext4 (rw,errors=remount-ro)

 # lvm pvdisplay | grep Name
   PV Name /dev/mapper/mpath0-part3
   VG Name mauricfo4-vg

the disk WWID contains spaces

 # multipath -l
 mpath0 (0QEMU QEMU HARDDISK trustyroot) dm-0 QEMU ,QEMU HARDDISK
 size=32G features='0' hwhandler='0' wp=rw
 |-+- policy='round-robin 0' prio=-1 status=active
 | `- 0:0:0:0 sda 8:0 active undef running
 `-+- policy='round-robin 0' prio=-1 status=enabled
   `- 0:0:1:0 sdb 8:16 active undef running

install new version

 # apt-get install multipath-tools-boot=0.4.9-3ubuntu7.8

 # dpkg -s kpartx | grep Version
 Version: 0.4.9-3ubuntu7.8

remove multipath configuration (user_friendly_names, bindings, wwids)
from rootfs and initramfs

 # rm -rf /etc/multipath*

 # mount /boot
 # update-initramfs -u
 update-initramfs: Generating /boot/initrd.img-4.2.0-27-generic

verify

 # reboot
 ...
 Loading, please wait...
 [ 0.482143] systemd-udevd[92]: starting version 204
 Begin: Loading essential drivers ... done.
 Begin: Running /scripts/init-premount ... done.
 Begin: Mounting root file system ... Begin: Running /scripts/local-top ... Begin: Loading multipath modules ...
 [ 0.546011] device-mapper: multipath: version 1.9.0 loaded
 Success: loaded module dm-multipath.
 Failure: failed to load module dm-emc.
 done.
 Begin: Starting multipathd ... [ 0.558504] multipathd (125): /proc/125/oom_adj is deprecated, please use /proc/125/oom_score_adj instead.
 [ 0.571510] device-mapper: multipath round-robin: version 1.0.0 loaded
 [ 0.661820] random: lvm urandom read with 60 bits of entropy available
 [ 0.910243] random: nonblocking pool is initialized
 done.
 Begin: Running /scripts/local-premount ... Begin: Waiting for udev to settle (multipath) ... done.
 done.
 [ 1.122520] EXT4-fs (dm-4): mounted filesystem with ordered data mode. Opts: (null)
 Begin: Running /scripts/local-bottom ... Begin: Stopping multipathd ... done.
 done.
 done.
 Begin: Running /scripts/init-bottom ... done.
 [ 1.211793] init: plymouth-upstart-bridge main process (339) terminated with status 1
 [ 1.211889] init: plymouth-upstart-bridge main process ended, respawning
 [ 1.230100] init: plymouth-upstart-bridge main process (350) terminated with status 1
 [ 1.230199] init: plymouth-upstart-bridge main process ended, respawning
 [ 1.415024] Adding 1417152k swap on /dev/mapper/mauricfo4--vg-swap_1. Priority:-1 extents:1 across:1417152k FS
 [ 1.417519] EXT4-fs (dm-4): re-mounted. Opts: errors=remount-ro

Great, the rootfs is found and mounted.

Notice this setup (LVM on multipath) hits LP #1540401,
but non-LVM on multipath doesn't, as originally reported.

 The disk drive for /boot is not ready yet or not present.
 keys:Continue to wait, or Press S to skip mounting or M for manual recovery

 keys: S

And the system boots successfully:

 # mount | grep ' / '
 /dev/mapper/mauricfo4--vg-root on / type ext4 (rw,errors=remount-ro)

 # pvdisplay | grep Name
   PV Name /dev/HARDDISK
   VG Name mauricfo4-vg

 # multipath -l
 0QEMU QEMU HARDDISK trustyroot dm-0 QEMU ,QEMU HARDDISK
 size=32G features='0' hwhandler='0' wp=rw
 |-+- policy='round-robin 0' prio=-1 status=active
 | `- 0:0:0:0 sda 8:0 active undef running
 `-+- policy='round-robin 0' prio=-1 status=enabled
   `- 0:0:1:0 sdb 8:16 active undef running

Notice the LVM PV senses the multiple symlinks problem
(due to the spaces in the WWIDs) but this can be fixed
(if desired) on a later update,
and does not occur w/ user_friendly_names.

The system *is* bootable, and the device-mapper table is correct
(LVM stacked on multipath devices):

 root@mauricfo4:~# dmsetup table | sort
 0QEMU QEMU HARDDISK trustyroot: 0 67108864 multipath 0 0 2 1 round-robin 0 1 1 8:0 1000 round-robin 0 1 1 8:16 1000
 0QEMU QEMU HARDDISK trustyroot-part1: 0 14336 linear 252:0 2048
 0QEMU QEMU HARDDISK trustyroot-part2: 0 499712 linear 252:0 16384
 0QEMU QEMU HARDDISK trustyroot-part3: 0 66590720 linear 252:0 516096
 mauricfo4--vg-root: 0 63750144 linear 252:3 2048
 mauricfo4--vg-swap_1: 0 2834432 linear 252:3 63752192

The boot problem is fixed.
Marking as verification-done.