current + mpt = panic: Bad link elm 0xffffff80002d6480 next->prev != elm

Svein Skogen (Listmail account) svein-listmail at
Tue Jul 20 12:16:50 UTC 2010

On 20.07.2010 13:55, Ståle Kristoffersen wrote:
> On 2010-07-20 at 12:17, Marius Strobl wrote:
>> On Mon, Jul 19, 2010 at 07:06:54PM +0200, Stle Kristoffersen wrote:
>>> On 2010-07-18 at 14:20, Marius Strobl wrote:
>>>>>> Downgrading now...
>>>>> And it crashed again, with current from r209598...
>>>> Ok, this at least means that your problem isn't caused by the recent
>>>> changes to mpt(4) as the pre-r209599 version only differed from the
>>>> 8-STABLE one in a cosmetic change at that time.
>>> I have another data-point, I cvsup'ed to the latest current again, and
>>> rebuilt without INVARIANT and WITNESS, and now it seems to survive the
>>> timeouts.
>> That's more or less expected as the sanity check issuing the panic
>> just isn't compiled in then. However, my understanding was that with
>> STABLE you don't get the timeouts in the first place, or do you see
>> them there also?
> I got the timeouts with STABLE as well, that was the reason for me to
> try out CURRENT. I'm sorry I didn't mention that earlier.
> My main concern is to get rid of the timeouts, but a panic on one can't be
> right. How can I debug this further? I can get timeout fairly consistent by
> putting a bit of load on the drives. If it would help I can also provide
> remote access.
> I'm trying to update the firmware on some of the drives now to see if that
> helps with the timeouts.

Sorry for the late response here, but what you're describing matches
fairly well what I saw with RELENG_8 (just after 8.0 was released), but
luckily I didn't have any disks on my MPT, just my tape autoloader.

Random timeouts, and then bus resets (that made tape IO unreliable).

The bad news, is that I had the exact same trouble with OpenSolaris
(134), and something-similar with Linux (can't remember versions), at
the time.

I never did find a solution, and ended up throwing windows on the box,
just to get reliable backups.

My MPT is a 3801 LSI1068e based card running the latest bios.


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