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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? Helge Hafting - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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