Hi, any news?
Should I re-open #1567602 (you can see from the bisection the commit leads to 
this issue)?


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  sg devices are not being created for SCSI storage controller devices
  starting from v4.4.0-30

Status in linux package in Ubuntu:

Bug description:
  Most storage array expose a store controller device to logical unit 0.
  Following LP #1567602, when this happens and the alua driver is loaded, 
Ubuntu doesn't create the sg device for it, and linux fails to discover the 
disks that are attached to higher logical unit numbers.

  With kernel version 4.4.0-31, we tried a number of things:
  - With a disk mapped to LUN0, everything is working.
  - Without a disk mapped to LUN0, nothing works - linux doesn't see disks 
mapped to higher LUNs, calling rescan_scsi_bus throws a stack trace to syslog: 
  - When turning on SCSI logging to the maximum 
(https://access.redhat.com/articles/337903 - 0xfffffff), we see that after ALUA 
driver rejected the SCSI controller nothing happens (look for 18:0:0:0 which is 
a controller here 
(https://gist.github.com/grzn/f8b65dd07b2df5f3f72ca8121d8c93ad) vs 19:0:00 
which is a disk here 
  - When removing the scsi_dh_alua driver and then reloading the lpfc driver, 
everything is working as expected when no disk is mapped to LUN0.
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 12 18:00 seq
   crw-rw---- 1 root audio 116, 33 Sep 12 18:00 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=1b089ce2-057f-44d6-9e53-5ee1b7fb5be9
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: VMware, Inc. VMware Virtual Platform
  Package: linux (not installed)
  ProcFB: 0 svgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic 
root=UUID=6738fbd7-7243-4860-949f-717dfd084c43 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
   linux-restricted-modules-4.4.0-31-generic N/A
   linux-backports-modules-4.4.0-31-generic  N/A
   linux-firmware                            1.157.3
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial xenial
  Uname: Linux 4.4.0-31-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: False
  dmi.bios.date: 09/17/2015
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 6.00
  dmi.board.name: 440BX Desktop Reference Platform
  dmi.board.vendor: Intel Corporation
  dmi.board.version: None
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 1
  dmi.chassis.vendor: No Enclosure
  dmi.chassis.version: N/A
  dmi.product.name: VMware Virtual Platform
  dmi.product.version: None
  dmi.sys.vendor: VMware, Inc.

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