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bbfa235
(Get the code!)
Under the assumption that this is related to harddrive (sata) I've tried changing fstab to not use the realtime function, but with no avail. The 2.6.25-7/8 kernels did not contribute to any improvement either.
However there's a major clue (ugly fix),
echo 1 > /proc/sys/
this triggers repetitive debug writes to disk, thus works like a "keep-alive". The funny thing is that the freezes cease when the block_dump is enabled. If the type of freeze that you experience is akin of mine then this should work. But this is nothing I would recommend. Also, I don't have tested this long enough to be sure, but 1h+ without freeze is sure a great improvement in my case.