Hi,
I finally nailed down the problem. The culprits are sendfile(2) function 
together with Atheros NIC or module. The minimal code to reproduce the bug is 
available at http://pastebin.com/r6jjQ7JL.

Please create a file 3kB long, compile the provide code, then run 
ar8131-sendfile port createdfile on server with Atheros card.
On different machine run: netcat server_address port > localfile.
Please compare the content of localfile and createdfile - md5sum is sufficient.

There is also a bug I just submitted in Debian:
http://bugs.debian.org/623059

Regards
    Artur

** Bug watch added: Debian Bug tracker #623059
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=623059

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Title:
  AR8131:webDAV corruption on Lucid: Lightning calendar not available

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