[Bug 1752961] Re: With kernel 4.13 btrfs scans for devices before all devices have been discovered

v4.17 final has the bug.

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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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