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    SubjectRe: 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader
    On Fri, 13 Oct 2006 15:11:11 +0200
    Helge Hafting <helge.hafting@aitel.hist.no> wrote:

    > Andrew Morton wrote:
    > > 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?
    > >
    > 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?
    >

    Maybe. The first step is to tell the developers. (adds cc).

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