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

[Svein Skogen (Listmail account)]

On 21.07.2010 18:33, Ståle Kristoffersen wrote:
> On 2010-07-20 at 14:16, Svein Skogen (Listmail account) wrote:
>> 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.
> 
> Hmm, that does not sound good. Did windows work on the same hardware
> without problems?

Yup. But notice that I do _NOT_ have any disks on my MPT (I have an MFI
for that), it's just a mini-sas<-->mini-sas into a HP 1/8G2 LTO3 Autoloader.

> I -might- have solved my problem. It has now ran for 24h without timeouts,
> and with a bit of load on it. I think I might have ran into the seagate +
> NCQ-problem, even tho seagate's webpage told me my drives was not affected
> (according to the serial numbers). I did however update the following
> num drives       firmware 
> 6x  ST31000340AS SD15
> 4x  ST31500341AS SD17

I have 8 of the last type (31500341AS) mine running on CC1H firmware,
connected to my MFI. Not a single glitch so far.

> 
> to firmware SD1B (old SD17) and SD1A (old SD15), and that looks like it has
> done the trick. I'll report back in a week or so if the problem has not
> reappeared.

Hope it's fixed for you. I'm still keeping an eye on the MPT code to see
if someone changes something that CAN be affecting my timeout
issues/reset, and if I see something promising, I'm willing to dump out
the entire server to tapes, and test run (I have sufficient spare tapes
to actually test without losing data), but such a job will take me a
week to prepare, and another to test. Quite a bit of time for something
that "may" solve my problem... ;)

//Svein

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