Am 31.08.2012 11:28, schrieb Jan Kara:

   Hello,

On Fri 31-08-12 09:43:37, Stefan Priebe - Profihost AG wrote:

quoted

i'm expected every night a hang of my rsync backup process, doing a
backup to an ext4 filesystem. Always throwing Call traces.

The hung task messages are really long so i posted it to pastebin:
http://pastebin.com/raw.php?i=9v7HEvjA

Used kernel: vanilla 3.0.41

Is this problem known? Or is there a fix for 3.0.X available?

   From a quick look, processes are waiting for IO so it may be that your
disk is just loaded... Did it start happening after some change? Or do you
experience unexpectedly low performance?

The main disk is XFS. The backup disk is ext4. The backup disk is doing 
nothing else than this SINGLE rsync task / process. So the only I/O is 
rsync itself.

So i don't expect low performance as the main disk is XFS ;-)

Greets,
Stefan