[7.2] R/W mount of / denied. Filesystem not clean - run fsck.

[Helmut Schneider]

Greg Byshenk <freebsd at byshenk.net> wrote:
> On Wed, May 06, 2009 at 11:50:11AM +0200, Helmut Schneider wrote:
>> Marat N.Afanasyev <amarat at ksu.ru> wrote:
>>> Helmut Schneider wrote:
>
>>>> after upgrading a few systems yesterday from 7.1-RELEASE to
>>>> 7.2-RELEASE  on one machine I got the error above. The problem was that
>>>>
>>>> - I was unable to cope with it but booting from a live CD.
>>>> - the message appeared ~ 1000 times and then the kernel paniced.
>>>>
>>>> After fsck'ing / with the help of the live CD I rebooted the
>>>> machine but  now I got the same problem with /home.
>>>>
>>>> How can I avoid such issues (except of not letting the machine
>>>> crash)? Is  there a way to boot at least to single user mode and
>>>> then run fsck (I was  at home, far away from the machine, not funny)?
>
>> There is no 'login' when / cannot be mounted...
>>
>>> fsck it. if you have another machine in there, you can try to make a
>>> serial console. or install a ip-kvm extender ;)
>>
>> I do have such thing (IBM Blade Center) but I'm looking for something to
>> avoid the situation above. Something that lets me at least boot into
>> single  user mode.
>
> If you had access to the console (I'm guessing you did in order to use the
> live CD), did you try booting into single-user from the beastie menu?

Yes, I did, same issue, screen filled up with message above, after ~5 
minutes kernel panic.

> IME, failure to fsck the / menu should drop automatically to single-user
> at the console, but if this fails, then you should be able to choose
> single-user boot from the menu, which will then not try to run fsck or
> mount / rw.  From there you should be able to fsck and remount /, as well
> as /home or anything else.  This will fail if there is something horribly
> wrong with /, causing a failure even when / is mounted ro, but then there
> may be no good solution.

There were only 2 or 3 inodes broken, fix from live CD ran smoothly.

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