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[dm-devel] Re: Bug#409875: cannot setup device-mapper mapping ontop of /dev/md* device

On Thu, Feb 08, 2007 at 10:51:50PM +0100, Johannes Schlumberger wrote:
I built the packages and installed them.
The attached file contains the generated stderr stream (which looks a bit
strange to me). Just to make shure, here is also the output generated from the
command without the redirection.

The stderr stream is fine. When you run it without redirection, bash will helpfully mask the null characters that are printed (which is not done when they are redirected to a file).

However, everything looks ok after studying that file, the first two ioctl's are executed (i.e. the device-mapper version is checked and the "root" mapping name is reserved).

Then when it is time to pass the actual parameters for the mapping using the "reload" ioctl, everything goes south. I'm quickly running out of ideas what might cause this or what the best way to debug it would be.

So I'm CC:ing this mail to some different people with the hope that someone other than me can spot the error.

Quoting from previous mails:
[04:11:35][root asso:/home/spjsschl]# cryptsetup -c aes -s 256 -d /dev/stdin
create root /dev/md0 < /key
Command failed: device-mapper: reload ioctl failed: Invalid argument

[04:12:57][root asso:/home/spjsschl]# dmesg | tail -n 3
device-mapper: table: 253:2: crypt: Device lookup failed
device-mapper: ioctl: error adding target to table
device-mapper: ioctl: device doesn't appear to be in the dev hash table.

[22:28:31][root asso:/tmp]# echo '0 10000 crypt aes-cbc-essiv:sha256 \
0123456789abcdef0123456789abcdef 0 /dev/md0 0' > map
[22:28:46][root asso:/tmp]# dmsetup create root map
device-mapper: reload ioctl failed: Invalid argument Command failed

Executive summary:
dmsetup / cryptsetup both fail to create a mapping on top of a raid device (/dev/md0 in this case).

For much more details, see the bug report, any help appreciated:

David Härdeman

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