confirmed on 
HP ProLiant ML10 Gen9, Xeon E3-1225 v5
Intel Raid Bios set to RAID1 (4 drives, 2xraid1)

Shutdowen/reboot hangs (kworkers) and Raid is rebuilt on every "reset"


Linux w11 4.4.0-93-generic #116-Ubuntu SMP Fri Aug 11 21:17:51 UTC 2017 x86_64 
x86_64 x86_64 GNU/Linux
Description:    Ubuntu 16.04.3 LTS
Release:        16.04

Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] 
[raid10]
md124 : active raid1 sdc[1] sdd[0]
      2930264064 blocks super external:/md125/0 [2/2] [UU]
      [=====>...............]  resync = 27.1% (795895744/2930264196) 
finish=190.3min speed=186838K/sec

md125 : inactive sdd[1](S) sdc[0](S)
      4776 blocks super external:imsm

md126 : active raid1 sda[1] sdb[0]
      976759808 blocks super external:/md127/0 [2/2] [UU]
      [===============>.....]  resync = 75.0% (733104704/976759940) 
finish=28.2min speed=143955K/sec

md127 : inactive sda[1](S) sdb[0](S)
      5288 blocks super external:imsm

unused devices: <none>

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https://bugs.launchpad.net/bugs/1587142

Title:
  Shutdown hangs in md kworker after "Reached target Shutdown."

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