How to find commit making error in kernel?

I have trouble with opensuse (tumbleweed) kernel. I use git bisect previously, but wonder how to use it to find broken commit in kernel. What should I know? How long it can took (build kernel, rebooting, etc)?

@Lachu:

I assume that, you know where the Linux Kernel document detailing the usage of “git bisect” is located → <Bisecting a regression>
There’s also some useful URLs in that document providing additional details of how the Kernel can be inspected with this tool.

What about secure boot? How to sign kernel/modules. I was signing ashmem/binder modules by myself, but never does whole kernel+each module.

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