[Bug 1815599] Re: multipath shows '#:#:#:#' for iscsi device after error injection

[Christian Ehrhardt ]

The loss of that path info suggests that it lost the knowledge about that.
I found very old bug 1032550 - the assumption there was that it would eventually be a kernel bug due to sysfs loosing the information multipath might need. But back then the actions on the bug stopped (I have no insight why as I wan't around at the time).

Even more so than already before I'd be happy to have the IBM zfcp Devs
subscribed as they surely know better about that part of the
multipath/zfcp stack.

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Title:
  multipath shows '#:#:#:#' for iscsi device after error injection

Status in Ubuntu on IBM z Systems:
  New
Status in multipath-tools package in Ubuntu:
  Incomplete

Bug description:
  Problem Description:
  After error injection(reset one node for storage), 1 of 4 luns show '####' for half paths

  ---uname output---
  root at ilzlnx4:~# uname -a
  Linux ilzlnx4 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:43:05 UTC 2018 s390x s390x s390x GNU/Linux

  Machine Type = s390x

  
  --iscsi initiator
  root at ilzlnx4:~# dpkg  -l  | grep iscsi
  ii  open-iscsi                            2.0.874-5ubuntu2.6                s390x        iSCSI initiator tools

   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
  1 Mapping 4 luns via open-iscsi from SVC
  2 Running IO on these luns
  3 Run storage side error inject 'node reset' for SVC (about start at ?2019/02/11 05:14?)
  4 half of one luns' path show '#:#:#:#' and never recovered without manual intervention


  [2019/02/11 05:53:13]  INFO send: multipath -ll | cat  
  [2019/02/11 05:53:29]  INFO  
  3600507638085814a980000000000000a dm-3 IBM,2145 
  size=10G features='3 queue_if_no_path queue_mode mq' hwhandler='0' wp=rw 
  |-+- policy='service-time 0' prio=50 status=active 
  | |- 4:0:0:3 sdr 65:16 active ready running 
  | `- 6:0:0:3 sdu 65:64 active ready running 
  `-+- policy='service-time 0' prio=10 status=enabled 
    |- 1:0:0:3 sdh 8:112 active ready running 
    `- 2:0:0:3 sdl 8:176 active ready running 
  3600507638085814a9800000000000009 dm-4 IBM,2145 
  size=10G features='3 queue_if_no_path queue_mode mq' hwhandler='0' wp=rw 
  |-+- policy='service-time 0' prio=50 status=active 
  | |- 1:0:0:1 sdf 8:80  active ready running 
  | `- 2:0:0:1 sdj 8:144 active ready running 
  `-+- policy='service-time 0' prio=0 status=enabled 
    |- #:#:#:# sdo 8:224 active faulty running 
    `- #:#:#:# sds 65:32 active faulty running 
  3600507638085814a9800000000000008 dm-2 IBM,2145 
  size=10G features='3 queue_if_no_path queue_mode mq' hwhandler='0' wp=rw 
  |-+- policy='service-time 0' prio=50 status=active 
  | |- 4:0:0:2 sdq 65:0  active ready running 
  | `- 6:0:0:2 sdt 65:48 active ready running 
  `-+- policy='service-time 0' prio=10 status=enabled 
    |- 2:0:0:2 sdk 8:160 active ready running 
    `- 1:0:0:2 sdg 8:96  active ready running 
  3600507638085814a9800000000000006 dm-5 IBM,2145 
  size=10G features='3 queue_if_no_path queue_mode mq' hwhandler='0' wp=rw 
  |-+- policy='service-time 0' prio=50 status=active 
  | |- 4:0:0:0 sdm 8:192 active ready running 
  | `- 6:0:0:0 sdp 8:240 active ready running 
  `-+- policy='service-time 0' prio=10 status=enabled 
    |- 1:0:0:0 sde 8:64  active ready running 
    `- 2:0:0:0 sdi 8:128 active ready running

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