linux-kernel - Re: 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader

lists.openwall.net		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 linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20061012112938.97ef924c.akpm@osdl.org>
Date:	Thu, 12 Oct 2006 11:29:38 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Helge Hafting <helge.hafting@...el.hist.no>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader

On Thu, 12 Oct 2006 14:18:04 +0200
Helge Hafting <helge.hafting@...el.hist.no> wrote:

> I found an easy way to hang the kernel when copying a SD-card:
> 
> dd if=/dev/sdc of=file bs=1048576
> 
> I.e. copy the entire 256MB card in 1MB chunks.  I got about
> 160MB before the kernel hung.  Not even sysrq+B worked, I needed
> the reset button.  The pc has a total of 512MB memory if that matters.
> 
> Using bs=4096 instead let me copy the entire card with no problems,
> but that seems to progress slower.
> 
> The above 'dd' command hangs my office pc every time. So I can repeat
> it for debugging purposes. 
> 

What device driver is providing /dev/sdc?

Did any previous kernels work correctly?  If so, which?
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/