[Bug 1629644] Re: Trusty: failure to detect device with 0.4.9-3ubuntu7.5

[ChristianEhrhardt]

That change could more be a source of what you describe.
It contains a huge set of backports in regard to ignore "local non-mpath devices"

 * Cherry-picked patches to ignore local non-mpath devices
    - 0001-multipath-add-checker_timeout-default-config-option.patch                 
    - 0002-Make-params-variable-local.patch                                          
    - 0003-libmultipath-Fix-possible-string-overflow.patch                           
    - 0004-Update-hwtable-factorization.patch                                        
    - 0005-Fixup-strip-trailing-whitespaces-for-getuid-return-v.patch                
    - 0006-Remove-sysfs_attr-cache.patch                                             
    - 0007-Move-setup_thread_attr-to-uevent.c.patch                                  
    - 0008-Use-lists-for-uevent-processing.patch                                     
    - 0009-Start-uevent-service-handler-from-main-thread.patch                       
    - 0010-libmultipath-rework-sysfs-handling.patch                                  
    - 0011-Rework-sysfs-device-handling-in-multipathd.patch                          
    - 0012-Only-check-offline-status-for-SCSI-devices.patch                          
    - 0013-Check-for-offline-path-in-get_prio.patch                                  
    - 0014-libmultipath-Remove-duplicate-calls-to-path_offline.patch                 
    - 0015-Update-dev_loss_tmo-for-no_path_retry.patch                               
    - 0016-Reload-map-for-device-read-only-setting-changes.patch                     
    - 0017-multipath-get-right-sysfs-value-for-checker_timeout.patch                 
    - 0018-multipath-handle-offlined-paths.patch                                     
    - 0019-multipath-fix-scsi-timeout-code.patch                                     
    - 0020-multipath-make-tgt_node_name-work-for-iscsi-devices.patch                 
    - 0021-multipath-cleanup-dev_loss_tmo-issues.patch                               
    - 0022-Fix-for-setting-0-to-fast_io_fail.patch                                   
    - 0023-Fix-fast_io_fail-capping.patch                                            
    - 0024-multipath-enable-getting-uevents-through-libudev.patch                    
    - 0025-Use-devpath-as-argument-for-sysfs-functions.patch                         
    - 0026-multipathd-remove-references-to-sysfs_device.patch                        
    - 0027-multipathd-use-struct-path-as-argument-for-event-pro.patch                
    - 0028-Add-global-udev-reference-pointer-to-config.patch                         
    - 0029-Use-udev-enumeration-during-discovery.patch                               
    - 0030-use-struct-udev_device-during-discovery.patch                             
    - 0031-More-debugging-output-when-synchronizing-path-states.patch                
    - 0032-Use-struct-udev_device-instead-of-sysdev.patch                            
    - 0033-discovery-Fixup-cciss-discovery.patch                                     
    - 0035-Use-udev-devices-during-discovery.patch                                   
    - 0036-Remove-all-references-to-hand-craftes-sysfs-code.patch                    
    - 0037-multipath-libudev-cleanup-and-bugfixes.patch                              
    - 0038-multipath-check-if-a-device-belongs-to-multipath.patch
    - 0039-multipath-and-wwids_file-multipath.conf-option.patch                  
    - 0040-multipath-Check-blacklists-as-soon-as-possible.patch                  
    - 0041-add-wwids-file-cleanup-options.patch                                  
    - 0042-add-find_multipaths-option.patch

Your devices are reported as:
mpath2 (36742b0f0000075500000000000002de4) dm-2 NFINIDAT,InfiniBox
size=954M features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=-1 status=active
  `- 2:0:0:3 sdd 8:48 active undef running

Maybe there is a false positive in those fixes.

To continue on this we need very exact description on your device type,
storage backend, and anything else that defines your disk setup in
HW&SW.

Then depending on availability of such devices or at least a similar
setup a reproduction can be tried - if not possible one might suggest
different things to be tested on your end, but that is way slower and
more error prone.

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https://bugs.launchpad.net/bugs/1629644

Title:
  Trusty: failure to detect device with 0.4.9-3ubuntu7.5

Status in multipath-tools package in Ubuntu:
  New

Bug description:
  When trying to detect a device with the latest 0.4.9-3ubuntu7.14 version, no device is detected.
  When downgrading to 0.4.9-3ubuntu7 everything works fine.
  See this console log for more detail: https://gist.github.com/amito/4108cd7ee895baecc9a6412e7c5fdeac

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