[Bug 1550831] Re: btrfs RAID on USB drives mounted multiple times

[Rolf Leggewie]

I can confirm the problem, on trusty.  I believe I've even confirmed
another ticket that is open already on LP somewhere.

First comment, this is not about RAID.  Simple multi-device btrfs are
affected as well.  I will adjust the title of the ticket accordingly.
Second comment, it is highly unlikely for this to be a problem in
initramfs.  The udisks2 package seems a much more likely candidate.

** Package changed: initramfs-tools (Ubuntu) => udisks2 (Ubuntu)

** Changed in: udisks2 (Ubuntu)
       Status: New => Confirmed

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Title:
  multi-device btrfs on external media are automatically mounted
  multiple times (once per device)

Status in udisks2 package in Ubuntu:
  Confirmed

Bug description:
  I have a btrfs RAID5 on 9 external USB3 drives. When I started the 16.04 beta1 Lubuntu live CD, the btrfs volume (named Backup) was mounted 8 times:
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdk1 at /media/lubuntu/Backup on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdj1 at /media/lubuntu/Backup1 on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdi1 at /media/lubuntu/Backup2 on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdh1 at /media/lubuntu/Backup3 on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdf1 at /media/lubuntu/Backup4 on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sde1 at /media/lubuntu/Backup5 on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdc1 at /media/lubuntu/Backup6 on behalf of uid 999
  /var/log/syslog:Feb 28 00:45:51 lubuntu udisksd[2620]: Mounted /dev/sdb1 at /media/lubuntu/Backup7 on behalf of uid 999

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: initramfs-tools 0.122ubuntu3 [modified: usr/sbin/update-initramfs]
  ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2
  Uname: Linux 4.4.0-7-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.367
  CurrentDesktop: LXDE
  Date: Sun Feb 28 01:02:46 2016
  LiveMediaBuild: Lubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: initramfs-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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