single user mode?

[Warner Losh]

> On Dec 5, 2014, at 1:47 PM, John-Mark Gurney <jmg at funkthat.com> wrote:
> 
> Anton Shterenlikht wrote this message on Fri, Dec 05, 2014 at 05:06 -0800:
>> Is it possible to enter a single user mode
>> on arm 10.1-release?
> 
> If you're using loader, yes it is possible, but often loader is not
> used on arm...
> 
>> My disk, well.. the sd card, got corrupted,
>> so wanted to run fsck on it, but cannot
>> enter a single user mode. I ended up putting
>> the sd card into a laptop and running fsck there.
>> This fixed lots of panics, but is it possible
>> to enter the single user mode on arm, and
>> run fsck directly there?
> 
> You do know of:
> fsck_y_enable="NO"      # Set to YES to do fsck -y if the initial preen fails.
> 
> which might help…

There’s a semi-known, semi-reproducible issue with arm (but maybe not armv6)
where ANY errors that require an FSCK will land you in this situation. It hasn’t
been tracked down yet. There seems to be three or four variations that Ian and I
have run into. The trouble is tracking this down is a big investment in time,
potentially, and there’s been lots of bigger fish to fry :(

Warner

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