lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 3 Nov 2008 16:51:44 +0100
From:	Jindrich Makovicka <>
Subject:  Re: data corruption with ext4 (from exposed by rtorrent

On Mon, 3 Nov 2008 16:34:10 +0100
Cryptooctoploid <> wrote:

> On Mon, Nov 3, 2008 at 2:40 PM, Theodore Tso <> wrote:
> > On Mon, Nov 03, 2008 at 12:42:11PM +0000, Roc Valles wrote:
> >> 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.
> I have set up a debug torrent at:
> It contains four identical files that were generated with:
> dd if=/dev/zero of=zero.test0 count=1M
> My upload speed is limited (512 kbit/s), but I hope this may help.

The following testcase was used to trigger the infamous MAP_SHARED
dirty flag bug. Maybe it could be of some help here too:

Jindrich Makovicka

To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists