Public bug reported:

Assuming /dev/mapper/system-backup has 50GB of space ...

1. Expand an LVM volume with lvextend:
lvextend -L +50G /dev/mapper/system-backup

2. Resize the filesystem:
resize2fs  /dev/mapper/system-backup

All seems OK, no warning or error message will be displayed. No errors in 
syslog, too.
BUT the filesystem is only 50G big, the additional 50G will not be available.

df -h will tell you, that there is 50GB of free space, but if you try to
use this space, you will see the error: "filesystem full".

This bug exists at least since Ubuntu 10.10! Ubuntu 12.04.1 is also
affected!

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

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https://bugs.launchpad.net/bugs/1052529

Title:
  resize2fs does not expand filesystem; no error messages are displayed

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