Re: panic: ffs_valloc: dup alloc

On Mon, 14 Jun 2004 13:10:11 -0400 (EDT), Robert Watson  
<rwatson_at_freebsd.org> wrote:

> On Mon, 14 Jun 2004, Ronald Klop wrote:
>
>> I'm getting this panic 'panic: ffs_valloc: dup alloc'.  It happens on
>> -CURRENT, since quite some time.  It happens when doing an rsync from a
>> remote server to my secondary disk.  (ad2,master on ata1), there is no
>> slave on this controller.  And it always happens, so it is very
>> repeatable.  Is this probably a hardware failure? Or software?
>
> "dup alloc" tends to be a common symptom of races or other corruption
> (improper zeroing of memory, etc).  One thing I might recommend doing, if
> you haven't done it already, is to boot to single-user and do a manual
> fsck of the drive experiencing the problem to help identify if on-disk
> corruption is the source.  It might well be useful to log the results of
> that fsck to a log file (perhaps in an md memory backed file system) to
> include in a follow-up if there's anything interesting.

I reproduced the problem on a 'fsck -y' cleaned fs.
Attached is the output of the (second) 'fsck -y' after the panic.

Can you (or somebody else) take a look at it?

Greetings,

Ronald.

-- 
  Ronald Klop
  Amsterdam, The Netherlands