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SubjectRe: torrent hash failures since 3.9.0-rc1
On 2013.03.11 at 15:41 -0400, Dave Jones wrote:
> On Mon, Mar 11, 2013 at 08:17:53PM +0100, Markus Trippelsdorf wrote:
> > On 2013.03.11 at 18:18 +0100, Markus Trippelsdorf wrote:
> > > I get hash failures on "completed" torrents since 3.9.0-rc1 (Linux 3.8
> > > seems to be fine). What happens is that the torrents apparently complete
> > > successfully. After reboot however the hash check fails and there are
> > > missing (or corrupted) chunks. I've tested this with two different
> > > clients (rtorrent and aria2c) and both are affected. So I think this
> > > might be a filesystem issue.
> > >
> > > /dev/sda ext4 1.4T 666G 640G 51% /var
> > > /dev/sda on /var type ext4 (rw,noatime,data=ordered)
> > >
> > > I use ECC memory (and there is nothing in the logs).
> >
> > To reproduce this issue just do the following:
> >
> > % wget http://torrents.linuxmint.com/torrents/linuxmint-12-gnome-cd-nocodecs-64bit.iso.torrent
> > % rtorrent linuxmint-12-gnome-cd-nocodecs-64bit.iso.torrent
> > (Wait until the torrent finishes)
> > % sudo echo 3 > /proc/sys/vm/drop_caches
> > (Rehash the torrent (Ctrl-R))
> > The torrent doesn't rehash successfully and a few hunks are
> > missing/corrupted and need to be downloaded again.
>
> Worked fine for me on two separate machines. Could it be a network problem
> perhaps ? If something is mangling the packet before it hits the disk,
> that would explain it. What NIC do you use ?

I normally use ATL1E, but I've dusted off my E100 and the issue is also
reproducible on the Intel card.

> Or maybe you could isolate it to a filesystem problem using something
> like fsx ?

I've found fsx on your homepage, but I've no idea on how to use this
tool. Any pointers?

--
Markus


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