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Date:	Mon, 3 Nov 2008 12:42:11 +0000
From:	"Roc Valles" <>
Subject: data corruption with ext4 (from exposed by rtorrent

Some person already reported this. I'm having the same problem.
rtorrent is a bittorrent client that makes heavy use of mmap instead
of read/write to avoid needless duplication of data. It has exposed
other bugs in the past (mmap bug in 2.6.19).
Downloading a big torrent (>2GB) with rtorrent triggers it more times
than not. The bigger the torrent, the higher the likeliness of
failure. When the torrent is finished, if a hash check is forced by
pressing control-r on the torrent, some blocks will fail.
The torrent doesn't need to be a single file, but can be a series of
small files that add up enough.
Downloading on ext3 or XFS instead is 100% fine.
I've discarded posix fallocate as the culprit by building rtorrent
without the patch that adds that (and doing a du just in case,
definitively not preallocating).
Filesystem is ~1.4TB. I've also reproduced it on a 200GB partition.
The system is: Linux kaguya #1 SMP Mon Oct 27 14:43:19 UTC
2008 x86_64 Intel(R) Atom(TM) CPU 330 @ 1.60GHz GenuineIntel GNU/Linux
No kernel patches were applied.
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