[Bug-tar] Bug? Where? Why? Why so many files changing as we read them?

[Linda A. Walsh]

This may not be a tar bug, but I am trying to figure out
what is going on and/or why so many 'changes'...

using tar V1.28 on linux-4.1.0

Reading from a Win7-SP1 workstation via 'CIFS' (mounted fs)

trying to do:

>  tar cf ~/Appdata.tar --acls --xattrs Appdata

In my "Windows Home directory" as seen as a mounted file system via CIFS.

//Athenae/C/  /athenae/ cifs  
user,noauto,rw,uid=x,gid=x,nocase,serverino,creds=xxx,setuids 0 0

Trying to run tar, as such:

>  tar cf ~/Appdata.tar --acls --xattrs Appdata

And got **78** lines (out of 64389 files in 12357 directories)
that claim "something changed".
Note: I wasn't running any of the below related apps as tar ran:

....
tar: Appdata/Local/Google/Chrome/User Data/Default/Cache: file changed 
as we read it
tar: Appdata/Local/Google/Chrome/User Data/Default: file changed as we 
read it
tar: Appdata/Local/Google/Chrome/User Data: file changed as we read it
tar: Appdata/Local/Microsoft/ehome/Art Cache: file changed as we read it
tar: Appdata/Local/Microsoft/Media Player/Art Cache/LocalMLS: file 
changed as we read it
tar: Appdata/Local/Microsoft/OneNote/12.0/Backup/Personal Notebook: file 
changed as we read it
tar: Appdata/Local/Microsoft/OneNote/12.0/Backup: file changed as we read it
...
tar: Exiting with failure status due to previous errors
----


Of minor note, "find" commands run locally via cygwin
and on linux (via CIFS) both show the same # files+dirs
(76746) -- showing a 1:1 mapping.

I did an "ls -l" from both sides (cyg v. linux+CIFS) that shows
the last mod times -- Looked at 
"Appdata/Local/Microsoft/OneNote/12.0/Backup"
and the subdir "Personal Notebook":

  Oct 15 2012     Backup
  Mar 18 2015     Personal Notebook

I.e. neither looks like they changed recently.

So why the messages?



Thanks!