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[Bug 1570984] [NEW] Unable to dump to multipath root filesystem on ppc64el

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Public bug reported:

Reproducer
1.  Deploy trusty on a multipath rooted machine *(tested on ppc64el, may affect x86 as well).
2.  Install 3.16 kernel *(has not been verified with other kernels).
3.  sudo apt-get install linux-crashdump
4.  Set USE_KDUMP=1 in /etc/default/kdump-tools
5.  Set crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M@32M 
in /etc/default/grub.d/kexec-tools.cfg
6. update-grub
7. reboot
8. echo 1 > /proc/sys/kernel/sysrq
9. echo c > /proc/sysrq-trigger

Full console output attached.
 --------------------------------------Interesting parts of console output --------------------------------------
[   33.160186] sd 0:2:5:0: alua: port group c289 state A preferred supports TOlUSNA
[   33.160324] sd 0:2:5:0: alua: Attached
[   33.160396] alua: device handler registered
done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... Begin: Loading multipath modules ... Success: loaded module dm-multipath.
Failure: failed to load module dm-emc.
done.
Begin: Starting multipathd ... [   33.194232] multipathd (253): /proc/253/oom_adj is deprecated, please use /proc/253/oom_score_adj instead.
[   33.197208] random: nonblocking pool is initialized
done.
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 ... Success: loaded module dm-multipath.
Failure: failed to load module dm-emc.
done.
Begin: Starting multipathd ... 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!  /dev/mapper/mpath0-part2 does not exist.  Dropping to a shell!
[  213.258259] hidraw: raw HID events driver (C) Jiri Kosina


BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs) [  396.459853] ipr 0003:04:00.0: 9076: Configuration error, missing remote IOA
[  396.459935] ipr 0003:04:00.0: Attached Adapter not discovered within allotted time [PRC: 17101541]
[  396.460023] ipr 0003:04:00.0: Remote IOA VPID/SN:   00000000
[  396.460085] ipr 0003:04:00.0: Remote IOA WWN: 0000000000000000
[  396.460148] ipr: 00000000: 01000000 00000100 F4220000 00000000
[  396.460210] ipr: 00000010: 4C494344 49424D20 20202020 35374438
[  396.460271] ipr: 00000020: 30303153 4953494F 41202020 00000000
[  396.460333] ipr: 00000030: 30303431 4A303337 50050760 5EC28900

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: makedumpfile (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "dump_crashkernel=4096M@xxxxxxx"
   https://bugs.launchpad.net/bugs/1570984/+attachment/4637842/+files/dump_crashkernel%3D4096M%4032M.txt

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https://bugs.launchpad.net/bugs/1570984

Title:
  Unable to dump to multipath root filesystem on ppc64el

Status in initramfs-tools package in Ubuntu:
  New
Status in makedumpfile package in Ubuntu:
  New

Bug description:
  Reproducer
  1.  Deploy trusty on a multipath rooted machine *(tested on ppc64el, may affect x86 as well).
  2.  Install 3.16 kernel *(has not been verified with other kernels).
  3.  sudo apt-get install linux-crashdump
  4.  Set USE_KDUMP=1 in /etc/default/kdump-tools
  5.  Set crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M@32M 
  in /etc/default/grub.d/kexec-tools.cfg
  6. update-grub
  7. reboot
  8. echo 1 > /proc/sys/kernel/sysrq
  9. echo c > /proc/sysrq-trigger

  Full console output attached.
   --------------------------------------Interesting parts of console output --------------------------------------
  [   33.160186] sd 0:2:5:0: alua: port group c289 state A preferred supports TOlUSNA
  [   33.160324] sd 0:2:5:0: alua: Attached
  [   33.160396] alua: device handler registered
  done.
  Begin: Running /scripts/init-premount ... done.
  Begin: Mounting root file system ... Begin: Running /scripts/local-top ... Begin: Loading multipath modules ... Success: loaded module dm-multipath.
  Failure: failed to load module dm-emc.
  done.
  Begin: Starting multipathd ... [   33.194232] multipathd (253): /proc/253/oom_adj is deprecated, please use /proc/253/oom_score_adj instead.
  [   33.197208] random: nonblocking pool is initialized
  done.
  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 ... Success: loaded module dm-multipath.
  Failure: failed to load module dm-emc.
  done.
  Begin: Starting multipathd ... 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!  /dev/mapper/mpath0-part2 does not exist.  Dropping to a shell!
  [  213.258259] hidraw: raw HID events driver (C) Jiri Kosina

  
  BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs) [  396.459853] ipr 0003:04:00.0: 9076: Configuration error, missing remote IOA
  [  396.459935] ipr 0003:04:00.0: Attached Adapter not discovered within allotted time [PRC: 17101541]
  [  396.460023] ipr 0003:04:00.0: Remote IOA VPID/SN:   00000000
  [  396.460085] ipr 0003:04:00.0: Remote IOA WWN: 0000000000000000
  [  396.460148] ipr: 00000000: 01000000 00000100 F4220000 00000000
  [  396.460210] ipr: 00000010: 4C494344 49424D20 20202020 35374438
  [  396.460271] ipr: 00000020: 30303153 4953494F 41202020 00000000
  [  396.460333] ipr: 00000030: 30303431 4A303337 50050760 5EC28900

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