panic in geom (spindown + eil + journal)

[Eygene Ryabinkin]

Bjoern, good day.

Thu, Jun 26, 2008 at 12:26:42PM +0000, Bjoern A. Zeeb wrote:
> I guess some pointer artimetic or anything went wrong here for some
> reason. ad0 is a simple hdd with a few slices with different, mostly
> FreeBSD, installations. ad8 has, as seen above, eli on the disk and
> one standard gjournaled UFS on top of that.

May be provider's geom data was trashed in some way.

> Is there any information I could try to find out to find that bug.
> I had done the same thing hundreds of times before, the only new thing
> from yesterday on was the spindown on 2 of 3 disks.

Any chances to compile debug kernel with KDB/DDB

  http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-online-ddb.html

and when system will panic and debugger will be invoked, issue
commands 'p *(bp->bio_offset)' and 'p *(cp->provider)' at the stack
frame corresponding to the function g_io_request?
-- 
Eygene