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

[Ralf-Peter]

Public bug reported:

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)

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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Title:
  btrfs RAID on USB drives mounted multiple times

Status in initramfs-tools package in Ubuntu:
  New

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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