Little help in reporting a bug

Hi guys, i have a Buffalo Linkstation Pro/Live.

# cat /proc/cpuinfo
Processor    : Feroceon rev 0 (v5l)
BogoMIPS    : 266.24
Features    : swp half thumb fastmult edsp
CPU implementer    : 0x41
CPU architecture: 5TEJ
CPU variant    : 0x0
CPU part    : 0x926
CPU revision    : 0
Hardware    : Buffalo Linkstation Pro/Live

I mainly use this box like a fileserver and a torrent client with low
power consumption, but since i started to use encryption in my harddrive
and my swap i started to get problems and i dont know where to report them.
After update kernel to 2.6.32.1 , the page allocation failures i was
having and a few SATA reset errors in log vanished , but there is still
one error when downloading big files in the encrypted partition using
rtorrent. I contacted the rtorrent developer and he said me errors in
"check hash/corruption" are almost always hidden bugs in the filesystem
, and in this case , since i do not have errors when using unencrypted
partition, it probably is a kernel/fs problem related to mmap.
What can i do to try to debug this ? Where should i report this ?

Thank you all in advance.