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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1208978

Title:
  Empty tmpfs mount reported as full

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After using a tmpfs mount for a while it starts reporting that it is
  almost full and become unusable.

  $ mount ; df ; sudo ls -alR /tmp/test/

  <snip>
  none on /tmp/test type tmpfs (rw,uid=1000,gid=1000)
  none on /home/ken/.wine type aufs (rw,br:/tmp/test:/home/ken/.wine.dotnet20)

  Filesystem                           Size  Used Avail Use% Mounted on
  <snip>
  none                                1003M  881M  122M  88% /tmp/test
  none                                1003M  881M  122M  88% /home/ken/.wine

  /tmp/test/:
  total 12
  drwxrwxrwt  4 ken  ken    100 Aug  6 20:35 .
  drwxrwxrwt 10 root root 12288 Aug  6 20:38 ..
  -r--r--r--  1 root root     0 Aug  6 19:08 .wh..wh.aufs
  drwx------  2 root root    40 Aug  6 19:08 .wh..wh.orph
  drwx------  2 root root    40 Aug  6 19:08 .wh..wh.plnk

  /tmp/test/.wh..wh.orph:
  total 0
  drwx------ 2 root root  40 Aug  6 19:08 .
  drwxrwxrwt 4 ken  ken  100 Aug  6 20:35 ..

  /tmp/test/.wh..wh.plnk:
  total 0
  drwx------ 2 root root  40 Aug  6 19:08 .
  drwxrwxrwt 4 ken  ken  100 Aug  6 20:35 ..

  As you should be able to see the tmpfs mount on /tmp/test claims to be
  using ~900 MB but it's really only using a few bytes. It works
  perfectly for a while but then does this.

  I have been using the mount with aufs and the copy-on-write files are
  stored here. Since starting this report the "used" amount has dropped
  around 20 MB but there's no reason for this. There is no longer
  anything running that would use this directory.

  Nothing seems relevant in dmesg or the syslog.

  I don't know how to debug further.

  I will check the upstream kernel, but this is likely to cause other
  problems and will probably be difficult to recreate. I will report
  back once I know.

  Note to self: While testing
  http://bugs.winehq.org/show_bug.cgi?id=34217

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-51-generic-pae 3.2.0-51.77
  ProcVersionSignature: Ubuntu 3.2.0-51.77-generic-pae 3.2.48
  Uname: Linux 3.2.0-51-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices: aplay: device_list:252: no soundcards found...
  ApportVersion: 2.0.1-0ubuntu17.3
  Architecture: i386
  ArecordDevices: arecord: device_list:252: no soundcards found...
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D1', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Date: Tue Aug  6 20:38:16 2013
  HibernationDevice: RESUME=UUID=113e73a6-3c10-4fbc-a9a4-5160e676d325
  InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Dell Inc. MM061
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-51-generic-pae root=UUID=0c3228e5-3952-43c1-b666-1c790f791025 ro persistent zcache
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-51-generic-pae N/A
   linux-backports-modules-3.2.0-51-generic-pae  N/A
   linux-firmware                                1.79.6
  RfKill: Error: [Errno 2] No such file or directory
  SourcePackage: linux
  StagingDrivers: zram
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/13/2007
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A17
  dmi.board.name: 0KD882
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA17:bd06/13/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0KD882:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: MM061
  dmi.sys.vendor: Dell Inc.

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