Andrew Morton wrote:
On Thu, 12 Oct 2006 14:18:04 +0200
Helge Hafting <[email protected]> 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?
It is an usb card reader, so it is "usb mass storage"
and "scsi disk".
Did any previous kernels work correctly? If so, which?
I just got that card reader, so I haven't tested any earlier kernels.
I have another machine with a card reader, which I have used for
a long time. But I only ever copy files with "cp" on that one.
This time I used "dd" to get an image of the entire card, and got trouble
when using 1M chunks.
I can try with verbose scsi debug messages if that might help?
Helge Hafting
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