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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Wed, 07 Sep 2011 09:54:03 -0400 (EDT)
Cc: Arnaud Lacombe <lacombar@gmail.com>
Subject: Re: FS corruption between 8-STABLE and 7-STABLE
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On Tuesday, September 06, 2011 5:55:09 pm Arnaud Lacombe wrote:
> Hi,
> 
> I got a strange boot failure when booting a FreeBSD 7-stable after a
> 8-stable kernel, with a FreeBSD 7.4 kernel:
> 
> pid 100 (fsck_ufs), uid 0: exited on signal 8
> pid 101 (fsck_ufs), uid 0: exited on signal 8
> WARNING: R/W mount of / denied.  Filesystem is not clean - run fsck
> WARNING: R/W mount of / denied.  Filesystem is not clean - run fsck
> 
> it would seem that going 8-STABLE change the filesystem in such a way
> 7-STABLE cannot be booted after.
> 
> Thanks guys ...

I boot 8 kernels on machines with a 7 world and back to a 7 kernel all the 
time without any issues.  Did you upgrade your world to 8 and then try to boot 
it with a 7.4 kernel?

-- 
John Baldwin