[Bug 1520192] Re: multipath-tools from Precise should have been fixed together with Trusty fixes

[Gábor Mészáros]

Steps taken to provoke the problem:
1.) deploy any VM instance using nova commands, that is booted from EMC VNX series SAN connected to compute using iscsi, dm-multipath
2.) unplug/disable network connectivity on any of the active paths
3.) check multipath -ll output for faulty failed path/device status.
4.) re-plug/enable network connectivity on the disabled paths
5.) check multipath -ll output for recovering to active enabled path/device status

Somtimes the problem occurs when disabling the interface, other times
only when re-enabling it.

Expected output for multipath -ll:
36006016047813400dd029f614896e511 dm-3 DGC     ,VRAID           
size=50G features='0' hwhandler='1 alua' wp=rw
`-+- policy='round-robin 0' prio=70 status=active
  |- 6:0:0:15 sdi   8:128  active ready  running
  |- 7:0:0:15 sdk   8:160  active ready  running
  |- 8:0:0:15 sdm   8:192  active ready  running
  `- 9:0:0:15 sdo   8:224  active ready  running

Actual output (even after several hours of waiting, with active traffic on storage):
36006016047813400dd029f614896e511 dm-3 DGC,VRAID
size=50G features='0' hwhandler='1 alua' wp=rw
`-+- policy='round-robin 0' prio=70 status=active
  |- 6:0:0:159 sdi 8:128 active ready  running
  |- 7:0:0:159 sdk 8:160 failed ready  running
  |- 8:0:0:159 sdm 8:192 active ready  running
  `- 9:0:0:159 sdo 8:224 failed ready  running

A previously discovered workaround for the problem can be achieved by reloading the multipath-tools service (or restarting, but multipath -r does not always fixes it).
The package with backported changes is confirmed to fix the issue, without having to reload the service.

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https://bugs.launchpad.net/bugs/1520192

Title:
  multipath-tools from Precise should have been fixed together with
  Trusty fixes

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