Strange ZFS problem, filesystem claims to be full when clearly not full

[Torbjorn Kristoffersen]

On Fri, Oct 1, 2010 at 6:25 AM, Gary Palmer <gpalmer at freebsd.org> wrote:
> On Thu, Sep 30, 2010 at 04:34:06PM +0200, Alexander Leidinger wrote:
>> Quoting Torbjorn Kristoffersen <torbjoern at gmail.com> (from Thu, 30 Sep
>> 2010 15:28:25 +0200):
>>
>> >That could very well be.  Interestingly, dtrace is not installed and
>> >doesn't even load.  When I do
>> >kldload dtraceall it says:
>> >
>> >    kldload: can't load dtraceall: Exec format error
>> >
>> >??Perhaps I should recompile the kernel on this server, and build in
>> >Dtrace into the kernel.  Perhaps I should first update to
>> >FreeBSD-STABLE, as it is more cutting edge?
>> >
>> >Actually, I'll first do a complete backup of this jail, remove the zfs
>> >filesystem, then re-create it, put the files back, and see what
>> >happens.  The unfortunate thing is that I will be ruining a chance to
>> >find out what really happened.
>>
>> I would give lsof a try first. Installing it from ports or packages is
>> not as much time consuming as updating the server, and may pinpoint
>> the problem.
>>
>> Bye,
>> Alexander.
>
> It might be worth running
>
> ktrace -C
>
> as root.  I do not believe ktrace output files show up in lsof or fstat.
> It seems at least theoretically possible that a ktrace output file has
> been deleted so it no longer shows up in ls/du but the trace is ongoing.
>

Very unlikely as I'm the only admin outside the jails.  But I did it
regardless, you never know if I started
a ktrace in my sleep :-)