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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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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With kernel 4.13 btrfs scans for devices before all devices have been discovered
https://bugs.launchpad.net/bugs/1752961
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