** Description changed:

  I have an external usb HDD attached to my system to store parts of
  /home. Every time I suspend and resume the laptop, mount appends a
  subset of the mount options to the already existing list.
  
  I currently have this in the output of mount:
  
  /dev/sdc1 on /media/LaCie type ext4
  
(rw,nosuid,nodev,commit=600,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=0,commit=0,commit=600,commit=0,commit=0,commit=600,commit=0,commit=600,commit=600,commit=0,uhelper=udisks)
  
  /etc/fstab doesn't have a line for this disk.
+ 
+ ---------
+ 
+ Reproducer:
+ $ sudo modprobe scsi_debug
+ # ATTENTION! MAKE TRIPLE-SURE ABOUT THE DEVICE NAME HERE!
+ $ sudo mkfs.ext4 /dev/sdb
+ $ sudo mount /dev/sdb /mnt
+ $ grep sdb /etc/mtab
+ /dev/sdb /mnt ext4 rw 0 0
+ 
+ $ sudo mount -o remount,commit=600 /dev/sdb
+ $ grep sdb /etc/mtab
+ /dev/sdb /mnt ext4 rw,commit=600 0 0
+ 
+ $ sudo mount -o remount,commit=600 /dev/sdb
+ $ grep sdb /etc/mtab
+ /dev/sdb /mnt ext4 rw,commit=600,commit=600 0 0
+ 
+ 
+ ----------
+ 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: mount 2.19.1-2ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  CheckboxSubmission: ebb646ad5c6c4ca2fe9420855758001f
  CheckboxSystem: 7e42599bda39ea7ff8b528272b6ef52b
  Date: Thu Nov 17 21:29:08 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110127)
  ProcEnviron:
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
-  LC_PAPER=a4
+  PATH=(custom, user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
+  LC_PAPER=a4
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to oneiric on 2011-10-15 (33 days ago)

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https://bugs.launchpad.net/bugs/891688

Title:
  mount -o remount always appends options to /etc/mtab even if they
  already exist

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