[Bug 1032550] [NEW] [multipath] failed to get sysfs information

[vincent]

Public bug reported:

when shutdown switch port of host HBA,  multippath-tool can't get
correct information  of subpath. by check the "multipath" output,  some
storage device type info disapppear and the failed path always stay in
path group and don't be clear out.


mpath2 (3600601601c102900944737e4a73fe011) dm-51 ,
size=6.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| |- #:#:#:#  -    #:#     failed faulty running
| `- 5:0:2:5  sdcu 70:32   active ready running
`-+- policy='round-robin 0' prio=0 status=enabled
  |- 5:0:3:5  sdfa 129:192 active ready running
  `- #:#:#:#  -    #:#     failed faulty running
mpath38 (3600601601c1029008eb6dbe8ae3fe011) dm-59 DGC,VRAID
size=5.0G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 5:0:2:13 sddf 70:208  active ready running
`-+- policy='round-robin 0' prio=0 status=enabled
  `- 5:0:3:13 sdfk 130:96  active ready running
mpath63 (360000970000198700131533030303932) dm-13 EMC,SYMMETRIX
size=5.6G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 5:0:0:8  sdl  8:176   active ready running
  `- 5:0:1:8  sdbd 67:112  active ready running
mpath95 (360000970000198700131533030323445) dm-43 ,
size=898M features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- #:#:#:#  -    #:#     failed faulty running
  |- #:#:#:#  -    #:#     failed faulty running
  |- 5:0:0:38 sdas 66:192  active ready running
  `- 5:0:1:38 sdck 69:128  active ready running


Same time, the syslog show many

---------------
Aug  2 18:25:16 Linux51 multipathd: sdht: failed to get sysfs information
Aug  2 18:25:16 Linux51 multipathd: sdht: unusable path
... ...
---------------

After path  recover, all failed path come back without problem.  there
is no IP blocked and error happend during fail/recover period.

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

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Title:
  [multipath]  failed to get sysfs information

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