7.1 Panic on degraded disk w/mpt

[Scott Long]

Charles Sprickman wrote:
> (posted on -stable already, no takers - added info: full dmesg, crash 
> info from panic when array finished rebuilding, some comments on dmesg)
> 
> Howdy,
> 
> I dug around and can't find a PR on this, and the only other report I 
> saw was in this mailing list post that has no replies:
> 
> http://www.nabble.com/7.1-BETA2-panic-on-mpt-degrade-td20183173.html
> 
> The hardware is a Dell PowerEdge 860 with the Dell/LSI SAS5 controller:
> 
> mpt0: <LSILogic SAS/SATA Adapter> port 0xec00-0xecff mem 
> 0xfe9fc000-0xfe9fffff,0xfe9e0000-0xfe9effff irq 16 at device 8.0 on pci2
> mpt0: MPI Version=1.5.13.0
> 
> The panic is repeatable by forcing the array into a degraded state.  
> When the array finishes rebuilding, the box also panics.
> 
> Here's my best shot at getting info out of kgdb (panic on array going to 
> degraded state):

I wonder if the MPT card is temporarily detaching and then reattaching
the logical drive when the rebuild completes.  The info you posted is
inconclusive here.  CAM (the FreeBSD SCSI layer) has had some problems
handling device detaches, but we've been very fortunate to have someone
examining and fixing this recently.  Would it be possible for you to
upgrade to the most recent 8-CURRENT tree, and re-run your test?  If
not, I'll see about generating a patchset against 7.1.

Scott