Hello!

I've just switched to 5.12 kernel and find out that now I cannot install even the simplest kernel modules with only module_init/module_exit methods. Like here https://linux.die.net/lkmpg/x121.html

So, insmod fails with:
insmod: ERROR: could not insert module ./my-module.ko: Invalid parameters

And dmesg shows:
kernel read not supported for file /my-module.ko (pid: 6289 comm: insmod)

Here is the patch with this message:
https://git.kernel.org/pub/scm/linux...a2f3cdf95aaadf

Frankly, I don't understand what additionally I should specify in my module to make it work.

Any ideas what I do wrong and how to fix this?
Thanks a lot!

Were these modules compiled against kernel headers for this version?

It was the same virtual machine (virtualbox+vagrant). Actually I've found the problem. Virtualbox filesystem (vboxsf) is not updated for the 5.12 kernel, so the system couldn't load *.ko file content. When I've moved *.ko file to /var/tmp, insmod started to work as expected.

I see.

When you post a problem or question, it is always a good idea to mention if virtualization is involved, what kind, and which level has the problem.

Glad you solved it!

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