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    SubjectRe: 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader
    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.


    Helge Hafting
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