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SubjectRe: 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@aitel.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?
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