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[RVS <sergio.perez@xxxxxxxxxx>]

I have the same problem with tar version 1.27.1 on ubuntu server 14.04.1. Error "tar: .: file changed as we read it" and no files are being changed.
I made this research:
If I repeat the tar operation the errors appear on the same files.
I deleted a folder with some error files and then the error appeared in other files. If I repeat the operation then the errors keep on the same new files.
After undeleting the recently deleted folder then the errors come back to the initial group of files.
Each day, as the users work on their files (this is a backup procedure) the error files chage, but if I repeat the tar procedure the same night (without source file changes) the error remains in the same files.
It seems to be a random error affected by the files and folders being "tarred", but I couldn't find a failure pattern.

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https://bugs.launchpad.net/bugs/1243367

Title:
  tar complains about changed directory which hasn't changed

Status in tar package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 14.04 dev with tar 1.26+dfsg-8 and sometimes I'm
  seeing the message "tar: .: file changed as we read it" which seems to
  not be true. This bugs seems to be very difficult to reproduce and
  even the reproducing behavior is really annoying. As I got today on
  testing the chance for easy reproducing I have made a look with
  inotifywait what is happening:

  sworddragon@ubuntu:~$ mkdir tmp
  sworddragon@ubuntu:~$ inotifywait -mr tmp &
  [1] 12445
  sworddragon@ubuntu:~$ Setting up watches.  Beware: since -r was given, this may take a while!
  Watches established.
  ^C
  sworddragon@ubuntu:~$ cd tmp
  sworddragon@ubuntu:~/tmp$ tar --exclude "*\.tar" -zcf test.tar .
  tmp/ OPEN,ISDIR 
  tmp/ CREATE test.tar
  tmp/ OPEN test.tar
  tar: .: file changed as we read it
  tmp/ CLOSE_NOWRITE,CLOSE,ISDIR 
  tmp/ MODIFY test.tar
  tmp/ CLOSE_WRITE,CLOSE test.tar
  sworddragon@ubuntu:~/tmp$ rm test.tar
  tmp/ DELETE test.tar
  sworddragon@ubuntu:~/tmp$ tar --exclude "*\.tar" -cf test.tar .
  tmp/ CREATE test.tar
  tmp/ OPEN test.tar
  tmp/ OPEN,ISDIR 
  tmp/ CLOSE_NOWRITE,CLOSE,ISDIR 
  tmp/ MODIFY test.tar
  tmp/ CLOSE_WRITE,CLOSE test.tar
  sworddragon@ubuntu:~/tmp$ rm test.tar
  tmp/ DELETE test.tar
  sworddragon@ubuntu:~/tmp$ tar --exclude "*\.tar" -zcf test.tar .
  tmp/ OPEN,ISDIR 
  tmp/ CREATE test.tar
  tmp/ OPEN test.tar
  tar: .: file changed as we read it
  tmp/ CLOSE_NOWRITE,CLOSE,ISDIR 
  tmp/ MODIFY test.tar
  tmp/ CLOSE_WRITE,CLOSE test.tar
  sworddragon@ubuntu:~/tmp$ tar --exclude "*\.tar" -zcf test.tar .
  tmp/ OPEN,ISDIR 
  tmp/ MODIFY test.tar
  tmp/ OPEN test.tar
  tmp/ CLOSE_NOWRITE,CLOSE,ISDIR 
  tmp/ MODIFY test.tar
  tmp/ CLOSE_WRITE,CLOSE test.tar

  
  The bug only appears if a compression is activated (even with -J) and the tar archive doesn't already exist (tested both multiple times). The curious is if I'm closing the terminal and open it again I'm not able to reproduce this anymore. The bug will then randomly appear whenever I'm using tar.

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