[SLL] How to troubleshoot corrupted wget/apt-get/bittorrent file transfers?

[Phil Mocek]

I've recently noticed a pattern of something that has been
happening on my Ubuntu Intrepid box since it was running Hardy or
earlier.  When transferring files from outside my network, using
wget, aptitude, or deluge (a Bittorrent client), I frequently find
that the MD5 hash of the file I end up with doesn't match that of
the original (or in the case of aptitude, dpkg complains of
corrupted archives).

Clearing apt's package cache and retrying later eventually results
in getting a good file.  Deluge catches errors and re-transfers
the bad parts.  Rsync consistently cleans up after a bad wget
transfer.

There's nothing fishy in the kernel ring buffer.  I'm using
relatively new SATA drives with a 3Ware 9650 RAID controller.  On
the array is a dm-crypt volume that contains an LVM PV that is
allocated to a VG that contains multiple LVs.

How should I troubleshoot this situation?

-- 
Phil Mocek