Re: device-mapper: reload ioctl ... failed: No such file or directory

On 11/2/24 11:53 PM, David J Iannucci wrote:
> On Wed, Oct 30, 2024, at 01:10, Milan Broz wrote:
...

>> I expect that you have device-mapper udev rules properly installed.
> 
> I'm not sure - how can I check this? This is a fairly bare-bones Gentoo
> install and I'm not a big expert on everything that I should be, so that
> might have slipped through the cracks.
> 
> But...! I just found something... it seems I am running a systemd-udevd,
> which would not have been my choice... I have taken steps to keep
> systemd completely off my machine, so this is a surprise. Will consult
> Gentoo forums about this.

It is ok, udev is part of systemd project now, but can run without system
(I have it on my testing non-systemd Gentoo too - it is expected.)

>> Is there anything in syslog?
> 
> This is what comes out in /var/log/messages:
> 
> Nov  2 16:31:36 linux kernel: loop0: detected capacity change from 0 to 209715200
> Nov  2 16:31:36 linux kernel: device-mapper: table: 254:0: crypt: Error allocating crypto tfm
> Nov  2 16:31:36 linux kernel: device-mapper: ioctl: error adding target to table

Ok, *this* is the issue. Some kernel module is perhaps missing or misconfigured.

According to log, aes-xts-plain64 should be your image cipher.

Do you have aes, xts (and ecb, which xts internally use) kernel crypto modules compiled
and available?

Does "cryptsetup benchmark --cipher aes-xts" work?

If so, please send me tcryptDump "cryptsetup tcryptDump <your image>".

> p.s. I note that simple reply on this list goes only to the sender
>       rather than back to the list, which is maybe the way the list
>       prefers it? Though in my experience most tech lists like to keep
>       this kind of discussion on the list so that more eyes are on
>       things, and solutions are documented, but if that's not the case
>       here, kindly let me know and I'll use simple reply to individuals
>       from now on.

Yes, please always copy reply to list (unless it contain some private info).
This is default config for maillist server, just use reply to all.

Milan