[Bug 1723162] [NEW] du reports wrong file size for certain files

[Stephan]

Public bug reported:

I'm running coreutils 8.26-3ubuntu4 on artful amd64, kernel
4.13.0-12-generic. The file system in use is XFS on LVM2 on top of LUKS
(discard enabled).

Steps to reproduce:
1. Create a 4GB file with dd
2. Overwrite this file with another 4GB file using dd
3. Run stat and du -h on the file

Expected behavior: du should report the file as 4GB
Observed behavior: du shows the file as 8GB size

Attachment shows detailed log.

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

** Attachment added: "Detailed test case"
   https://bugs.launchpad.net/bugs/1723162/+attachment/4968863/+files/bugreport

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https://bugs.launchpad.net/bugs/1723162

Title:
  du reports wrong file size for certain files

Status in coreutils package in Ubuntu:
  New

Bug description:
  I'm running coreutils 8.26-3ubuntu4 on artful amd64, kernel
  4.13.0-12-generic. The file system in use is XFS on LVM2 on top of
  LUKS (discard enabled).

  Steps to reproduce:
  1. Create a 4GB file with dd
  2. Overwrite this file with another 4GB file using dd
  3. Run stat and du -h on the file

  Expected behavior: du should report the file as 4GB
  Observed behavior: du shows the file as 8GB size

  Attachment shows detailed log.

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