Public bug reported:

I am running several I/O intensive applications creating and deleting
many files on the separate /home partition. After about a day of
operation my root file system / containing everything except /home goes
100% full, although running ncdu -x from / shows just about 50%
fullness. 100% goes down to (correct) 52% after a reboot. Note that all
my files are created within the mounted /home partition. I do not run
any specific process as a root (beyond those of a stock Ubuntu 14.04
distribution).

$ df -h
Filesystem              Size  Used Avail Use% Mounted on
/dev/sda3                23G   12G   11G  52% /
/dev/sda6                98G   67G   27G  72% /home

1)
$ lsb_release -rd
Description:    Ubuntu 14.04 LTS
Release:        14.04

2)
$ apt-cache policy e2fslibs
e2fslibs:
  Installed: 1.42.9-3ubuntu1
  Candidate: 1.42.9-3ubuntu1
  Version table:
 *** 1.42.9-3ubuntu1 0
        500 http://se.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

3) I expect my file systems to be cleaned up withoutr rebooting

4) the root file system overflows just after 1 day of normal operation

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: e2fslibs 1.42.9-3ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Thu May 15 09:04:23 2014
Dependencies:
 gcc-4.9-base 4.9-20140406-0ubuntu1
 libc6 2.19-0ubuntu6
 libgcc1 1:4.9-20140406-0ubuntu1
 multiarch-support 2.19-0ubuntu6
InstallationDate: Installed on 2014-02-10 (93 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: e2fsprogs
UpgradeStatus: Upgraded to trusty on 2014-04-22 (22 days ago)

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1319667

Title:
  root file system 100% full, goes 52% after reboot

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