Re: losetup failed to set up loop device while rescuing a SD card that does not mount

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Tom.

Thanks very much. I am not sure that I follow your notes, but written below is the answer to your question.

On Sun, 22 Sep 2019 09:42:22 -0400 Tom Horsley <horsley1953@xxxxxxxxx> wrote:

> On Sun, 22 Sep 2019 08:32:19 -0500
> Ranjan Maitra wrote:
>
> > Any suggestions? I am on an updated F30.
>
> One possibility:
>
> If you ls /dev/loop* do you see loop0, loop1, etc.? At some point
> linux invented dynamic /dev/loop creation and said
> everyone should use it, but neglected to fix all the
> software in the world that expected loop devices to
> already exist.

I get:

ls -l /dev/loop*
crw-rw----. 1 root disk 10, 237 Sep 22 08:49 /dev/loop-control

Same result with sudo. I also tried

sudo rmmod loop
sudo modprobe
ls -l /dev/loop*
crw-rw----. 1 root disk 10, 237 Sep 22 08:49 /dev/loop-control

So got the same output. Should I now try what you have written in your notes below?

>
> Here's my notes from back in the fedora 20 timeframe:
>
> found this at work: https://bugzilla.redhat.com/show_bug.cgi?id=1019440
>
> 1. Create the file /etc/modules-load.d/loop.conf that just contains the word
> "loop" on a line by itself. This makes sure systemd arranges for the loop
> module to be loaded.
>
> 2. Create the file /etc/modprobe.d/eightloop.conf that contains the line:
>
> options loop max_loop=8
>
> Despite the name, that makes the min number of loop devices by 8 (which was
> the default kernel setting before they changed it).
>
> 3. Run (as root) "dracut --force" to rebuild the initrd with the new module
> options included.
>
> 4. Reboot and see 8 loop devices pre-created in /dev

Many thanks again, and best wishes,
Ranjan
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