tangeli

There are guides available. Search for ‘Linux kernel debugging’ or ‘Linux module debugging’, depending on which you are more interested in. And, of course, learn about the relevant parts of the kernel.

You might have a look at Debugging kernel and modules via gdb¶. The kernel.org site has a wealth of information.

What happened to “A rising tide lifts all boats”?

They may accept the ongoing cost, but that doesn’t make it free. There may be no cash payment, but that doesn’t make it free. Cost comes in many forms. The glib misrepresentation of the transaction is disappointing.

It’s not free.