Re: aic94xx panic on module load

["Darrick J. Wong" <djwong@us.ibm.com>]

Mark Haverkamp wrote:
> I got this panic when loading the aic94xx module.  The adapter is
> connected to an HP MSA50 SAS enclosure with 3 72GB SAS disks.
> 
> Kernel 2.6.19-rc6-scsi-misc on an x86_64
<snip>
> sas: task finished with resp:0x0, stat:0x89
> sas: sas_discover_sata() for device 500508b300a27a2c at 500508b300a27a2f:0xc returned 0xffffff06
> kobject_add failed for port-2:0:12 with -EEXIST, don't try to register things with the same name in the same directory.

Your expander is reporting your SAS disks to aic94xx as SATA disks,
which is why the sas_discover_sata fails.  I don't know why it would do
that... flaky hardware?  I'm not really sure what to do when we're given
bad information.

> Kernel BUG at drivers/scsi/libsas/sas_expander.c:603

I believe this BUG is fixed by a few patches in aic94xx-sas.  For sure
you'll want the patch named "libsas: better error handling in
sas_ex_discover_end_dev()" patch; see commit
82f6bc0849b6fce9a965dde11dd6f685adc7285e.

There are some dependencies:
e384a0bdd9d3abb5ba2f6eac9ac4d0ac61e1c6a1 ->
1f8787b198c4ba058a0bfc06c2ca7f301168a5dd ->
82f6bc0849b6fce9a965dde11dd6f685adc7285e.

--D