Linux 6.8.4 seems to have broken v4l2loopback in several ways.

[coppice-git]

Linux 6.8.4 seems to have broken v4l2loopback in several ways.

[umlaeute]

Could you please replace the template description in the top posting with the actual description of the problem?

It says:

Please remove these instructions (and other non-relevant information) from your report.
If your report looks like a copy of the template, it might get closed immediately.

[angelosa]

F39 version of v4l2loopback is v0.12.7, which seems incompatible (and rather old) with Linux kernel 6.8.4, it will throw deps errors when attempting to modprobe. A workaround is to git clone and compile v4l2loopback, cfr. this tutorial section

[coppice-git]

Fedora 39 has updated to Linux kernel 6.8.4 and this has broken v4l2loopback in several ways:
VFL_TYPE_GRABBER has gone. It seems VFL_TYPE_VIDEO should now be used instead, and is a direct replacement.
strlcpy() has gone. It looks like strscpy should be used instead, and is a direct replacement.
do_gettimeofday has gone. I think ktime_get() is supposed to be used now.
setup_timer() has gone. I'm not sure what the replacement for this looks like.

[umlaeute]

Ah, so the issue is, that fedora ships a new kernel but an old v4l2loopback (that is known to not work with newer kernels anyhow, eg #570, #574, #575)?

Then I suppose, I can close this issue as "out of date".

(The template asks the module version for a reason... In any case I've updated the bug reporting template, so it becomes easier for people to provide the relevant information)

[coppice-git]

I must have made a typo somewhere and didn't actually update my local repo copy. I just did a fresh checkout, and things work OK now. Thanks.

[umlaeute]

great to know it works