What is difference between loading module with loader and loading module wtih kldload?

[Oliver Pinter]

On 2/25/14, Lev Serebryakov <lev at freebsd.org> wrote:
> Hello, Hackers.
>
>   I've upgraded my fileserver to 10-STABLE and got very strange (but
>  very-very painful) problem, which I could not reproduce on virtual machine
>  (VirtualBox).
>
>  I'm using geom_raid5 module (and I'm its maintainer, yes) and module,
> built
> for 10-STABLE (after world & kernel build & install & reboot), and loaded
> via /boot/loader.conf is reason to almost instant crash after boot.
> Sometimes system mounts filesystems before crash and sometimes not. Most of
> time it is "page write: page not present", in different places. PS/2
> keyboard is always blocked after that, I could not drop to debugger. No
> memory dump performed. Several times it turend off video output (!) right
> after crash.

I have a similar crash with geom_sched. This introduced after fine
graded geom locks.

>
>  But if I boot without this module, drop to single-user mode, load module
> with kldload and continue booting with "exit" everything work smoothly for
> hours!
>
>  I understand, that it it some incompatibility between module new kernel,
> but I could not reproduce it on VirtualBox instance, and I'm puzzled, that
> this crash does not occur if module loaded by kldload! Maybe, here is some
> hint in this?
>
> --
> // Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>
>
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