Re: KLD zfs.ko: depends on kernel - not available or version mismatch

> On 9 Dec 2020, at 3:48, John Kennedy <warlock_at_phouka.net> wrote:
> 
>> I had to copy over several files from /etc and /usr/local/etc and re-installed the most important packages. This was admittedly a bit messy, it is possible that I forgot to copy something over.
>> (Originally my intention was to dd the contents of the spinning disk over, but apparently that disk has a few wonky sectors, dd failed after a few device timeouts)
> 
>  ... so, no guarantee that things are totally sane.
> 
> The "sane" we're looking for is how you can presumably be booting a kernel
> located at /boot/kernel/kernel and not have it match the kernel modules
> found under /boot/kernel.

(...)

> What I have built in my source tree is the kernel/zfs module I'd expect:
> 
> 	# md5 -r /usr/obj/usr/src/amd64.amd64/sys/GENERIC/kernel /usr/obj/usr/src/amd64.amd64/sys/GENERIC/modules/usr/src/sys/modules/zfs/zfs.ko /boot/kernel/kernel /boot/kernel/zfs.ko | sort
> 	941ab52d075e444da6eea7fb56213e10 /boot/kernel/kernel
> 	941ab52d075e444da6eea7fb56213e10 /usr/obj/usr/src/amd64.amd64/sys/GENERIC/kernel
> 	97d4e0c8ffed1f75e924bf8768a95ff1 /boot/kernel/zfs.ko
> 	97d4e0c8ffed1f75e924bf8768a95ff1 /usr/obj/usr/src/amd64.amd64/sys/GENERIC/modules/usr/src/sys/modules/zfs/zfs.ko
> 
> What are you seeing after your installkernel equivalent?

It turns out that I was being fooled by the BIOS. Even though I selected the device that this kernel and modules were on as the device to boot from, the actual kernel was still coming from the old spinning disk!

It would probably have taken me significantly longer to figure that out without your hints, as I was trying to solve the wrong problem. So thanks a lot for that. Having things to verify was a tremendous help.

I used the opportunity to switch to EFI booting, which took me the better part of the evening, but that's working now and booting the correct kernel. It’s even booting into a 1280x720 resolution with the help of the drm-devel-kmod.

The next challenge is getting Xorg to run on this Navi-10 GPU; so far I get stuck with "[KMS] drm report modesetting isn't supported”.

> Your hashes won't match mine due to non-reproducible build.
> 
> I'd make sure you don't have anything in /boot/modules or otherwise load any
> extra modules until sanity is restored (just to reduce random variables).

Ah yes, I wasn’t aware of /boot/modules. Last time I used CURRENT, modules were still in the kernel directory. Hence, that was also where I pointed kldload to to test my modules, which explains part of the confusion (and there’s no modules.old…).


Alban Hertroys
--
There is always an exception to always.