Date: Wed, 7 Sep 2011 00:16:22 -0400 From: Arnaud Lacombe <lacombar@gmail.com> To: Doug Barton <dougb@freebsd.org> Cc: freebsd-net@freebsd.org, Adrian Chadd <adrian@freebsd.org> Subject: Re: No IPFW binary compat across versions ? Message-ID: <CACqU3MX6SKepfhvQ8Tzv68ykgUOUz0qFXeoL1jCY_chKGMTAvA@mail.gmail.com> In-Reply-To: <4E656D30.3040905@FreeBSD.org> References: <CACqU3MXVLjJvF6RGqpC-hvnbTgb-uNC7V0AP0ofXDRs4n7Nmtg@mail.gmail.com> <CAHM0Q_N0UZu0tvqL6TiCOmJfHAt4sBtWM1abE%2BuJPS9ubARrfg@mail.gmail.com> <CACqU3MUjjYXabmYZtivDQKJ2v6HcWyo1_3AuTyyjN1o5%2BV6hhg@mail.gmail.com> <CACqU3MVvgftNMrGnoPaXB-MwyDqMc4jLd3qPWj9YEYdN3fJyyA@mail.gmail.com> <CAJ-Vmon464X%2BVh6=Ofiwnkt%2BAnmGysJAOsEiKxAkZ90tndGo7g@mail.gmail.com> <CACqU3MWToUAKPMLGYfkHgZkCqvnjJF=jkvqYV-PTieP9x96nrg@mail.gmail.com> <4E656D30.3040905@FreeBSD.org>
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Hi,
On Mon, Sep 5, 2011 at 8:45 PM, Doug Barton <dougb@freebsd.org> wrote:
> On 09/05/2011 17:18, Arnaud Lacombe wrote:
>> From my point of view, I should be able to run a FreeBSD 9.0 kernel
>> (when released) on top of a FreeBSD 5 userland without such issues.
>
> Unfortunately your expectation is completely unrealistic.
>
Completely unrealistic ? Seriously, you've got to be kidding me ?
I just downloaded a 4 (_four_) years old OpenWRT image, built the
latest Linux kernel in development and it worked just fine. netstat(8)
works just fine, I can pick a random iptables tutorial on the net, and
it still works fine. Those binaries are 4 years old and still work, oh
and I can go back at will to the original 2.6.19 without issue.
Now, let's see FreeBSD. Beside the issues included in that thread, the
latest development are the following: if you boot a FreeBSD 8-STABLE
kernel, with a 7.4 userland, then reboot on a 7-STABLE kernel, the
system will no longer boot, even in single user. Why ? because
fsck_ufs(8) crashes on a SIGFPE. I'll avoid commenting further.
Anyway, now I'll be obliged to re-install (well, find the motivation
first) if I want to be able to track down the mbuf corruption in
FreeBSD 7-STABLE I already reported.
Happy bikeshed coloring,
- Arnaud
> We do our best
> to maintain backward compatibility but sometimes improvements require
> breaking the KBI/ABI.
>
> Also, we have never supported running a kernel from RELENG_N on anything
> older than the latest version of RELENG_{N-1}.
>
>
> hth,
>
> Doug
>
> --
>
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>
> =A0 =A0 =A0 =A0Breadth of IT experience, and depth of knowledge in the DN=
S.
> =A0 =A0 =A0 =A0Yours for the right price. =A0:) =A0http://SupersetSolutio=
ns.com/
>
>
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