[Bug 1167305] [NEW] overlayfs shows some files as ?????

[Matthias Gehre]

Public bug reported:

1. I mounted an overlayfs with uppderdir=/a, lowerdir=/b to /c
2. I copied fileA to the upperdir
3a. Did 'ls -l /a' Output is
-rwxrwxrwx 1 root root 22153090041 Jan 11 22:45 fileA
3b. Did 'ls -l /b' Output is empty.
3c. Did 'ls -l /c'. Output is
-????????? ? ?    ?              ?            ? fileA
4. Did 'stat /c/fileA', Output is:
stat: cannot stat `fileA': No such file or directory

Is overlayfs broken? Did I do something wrong?
There is nothing in dmesg. Kernel is 3.5.0-26-generic #42.

How can I debug this?
I can do fairly advanced specific kernel debugging/recompiling with patches etc, but I don't know where to start.

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

** Description changed:

  1. I mounted an overlayfs with uppderdir=/a, lowerdir=/b to /c
  2. I copied fileA to the upperdir
  3a. Did 'ls -l /a' Output is
  -rwxrwxrwx 1 root root 22153090041 Jan 11 22:45 fileA
  3b. Did 'ls -l /b' Output is empty.
- 3c. Did 'ls -l /c'. Output is 
- total 90946868
+ 3c. Did 'ls -l /c'. Output is
  -????????? ? ?    ?              ?            ? fileA
  4. Did 'stat /c/fileA', Output is:
  stat: cannot stat `fileA': No such file or directory
  
  Is overlayfs broken? Did I do something wrong?
  There is nothing in dmesg. Kernel is 3.5.0-26-generic #42.
  
  How can I debug this?
  I can do fairly advanced specific kernel debugging/recompiling with patches etc, but I don't know where to start.

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Title:
  overlayfs shows some files as ?????

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