Re: Virtualbox kernel module on 11-CURRENT

From: Julian Elischer <julian_at_freebsd.org>
Date: Mon, 20 Jun 2016 19:15:56 +0800
On 8/06/2016 5:13 AM, Kevin Oberman wrote:
> On Tue, Jun 7, 2016 at 1:04 AM, Guido Falsi <mad_at_madpilot.net> wrote:
>
>> On 06/07/16 02:23, Rafael Rodrigues Nakano wrote:
>>> Hello,
>>>
>>> I tried installing virtualbox from packages, building it from sources,
>>> trying the GENERIC kernel but everytime I can't start the kernel module
>>> 'vboxdrv', it says:
>>> "KLD vboxdrv.ko: depends on kernel - not available or version mismatch.
>>> linker_load_file: Unsupported file type"
>>>
>> The virtualbox module needs to be in full sync with the kernel. Most
>> probably the sources being used by the cluster for building packages on
>> head are a little different from yours, so the kernel module is not in
>> sync.
>>
>> You will need to build the kernel module yourself to actually match your
>> kernel sources.
>>
>> It's not really a problem or a bug, it's how it works. On head there is
>> no warranty about the KBI. This cannot happen on releases and stable
>> because the KBI is not going to change there.
>>
>> --
>> Guido Falsi <mad_at_madpilot.net>
>>
> I don't think this is true. While shareable libraries have fixed ABIs, I
> believe the KBI can change even in STABLE branches.  If a security fix
> requires it, it might even change in a RELEASE. I my be wrong about this,
> but I recall having to re-build the VB kmod port even withing a minor
> version (i.e. STABLE).

We try hard NOT to change the KBI within a single stable branch.
we do things like add spare fields before we make a new stable branch 
to help with this.

> In any case, I do strongly recommend the use of PORTS_MODULES in
> /etc/src.conf to assure that the kernel modules always get re-built when
> the kernel is re-built. so that the sources, the kernel, and the module are
> in sync. The PORTS_MODULES are re-installed as a part of the "make
> installkernel", so things are almost safe, but beware of "make
> reinstallkernel" as it does not do the right thing. (See
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201779)
> --
> Kevin Oberman, Part time kid herder and retired Network Engineer
> E-mail: rkoberman_at_gmail.com
> PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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Received on Mon Jun 20 2016 - 09:16:09 UTC

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