It looks like 4.18 does not have the issue.

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https://bugs.launchpad.net/bugs/1752961

Title:
  With kernel 4.13 btrfs scans for devices before all devices have been
  discovered

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  In Progress
Status in linux source package in Cosmic:
  In Progress

Bug description:
  See attached dmesg outputs for booting kernels 4.11.x (working) and
  4.13.x (not working).

  dmesg-4.11.0-14-good.txt shows the dmesg output when booting kernel 4.11.x.
  btrfs scans for devices after all 4 (sda, sdb, sdc, sdd) of the devices have 
been discovered by the kernel.  The btrfs RAID1 filesystem mounts, and 
everything is good.

  dmesg-4.13.0-36-fail.txt shows the dmesg output when booting kernel 4.13.x.
  btrfs scans for devices after only 2 (sda, sdb) of the devices have been 
discovered by the kernel.  The btrfs RAID1 filesystem fails to mount ("failed 
to read the system array: -5").  The remaining 2 devices (sdc, sdd) are 
discovered by the kernel immediately afterward.  At the end of the log, I run 
`btrfs device scan` and mount the filesystem manually.

  Hardware:
    HP ProLiant MicroServer Gen8
    4x WDC WD20EFRX
  --- 
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 
2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: aplay: device_list:270: no soundcards found...
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  ArecordDevices: arecord: device_list:270: no soundcards found...
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2015-10-15 (933 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  MachineType: HP ProLiant MicroServer Gen8
  Package: linux (not installed)
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-20-generic 
root=UUID=d976ab07-8377-46dd-ac6c-f5f7312a8305 ro rootflags=subvol=@ 
rootdelay=10
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  Tags:  bionic apport-hook-error
  Uname: Linux 4.15.0-20-generic x86_64
  UnreportableReason: This report is about a package that is not installed.
  UpgradeStatus: Upgraded to bionic on 2018-05-05 (0 days ago)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 07/16/2015
  dmi.bios.vendor: HP
  dmi.bios.version: J06
  dmi.chassis.type: 7
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrJ06:bd07/16/2015:svnHP:pnProLiantMicroServerGen8:pvr:cvnHP:ct7:cvr:
  dmi.product.family: ProLiant
  dmi.product.name: ProLiant MicroServer Gen8
  dmi.sys.vendor: HP

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