| Date | Thu, 12 Oct 2006 14:18:04 +0200 | From | Helge Hafting <> | Subject | Re: 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader |
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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 - 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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