Re: hpsa driver bug crack kernel down!

[Jiang Liu]

Hi Baoquan,
	Could you please help to give output of "lspci -vvvv"?
Is device "hpsa 0000:03:00.0" a legacy PCI device(non-PCIe)?
It may have relationship with IOMMU driver.
Thanks!
Gerry

On 2014/4/10 12:03, Bjorn Helgaas wrote:
> [+cc Joerg, iommu list]
> 
> On Wed, Apr 9, 2014 at 6:19 PM, Davidlohr Bueso <davidlohr@xxxxxx> wrote:
>> On Wed, 2014-04-09 at 16:50 -0700, James Bottomley wrote:
>>> On Wed, 2014-04-09 at 16:40 -0700, Davidlohr Bueso wrote:
>>>> On Wed, 2014-04-09 at 16:10 -0700, James Bottomley wrote:
>>>>> On Wed, 2014-04-09 at 16:08 -0700, James Bottomley wrote:
>>>>>> [+linux-scsi]
>>>>>> On Wed, 2014-04-09 at 15:49 -0700, Davidlohr Bueso wrote:
>>>>>>> On Wed, 2014-04-09 at 10:39 +0800, Baoquan He wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> The kernel is 3.14.0+ which is pulled just now.
>>>>>>>
>>>>>>> Cc'ing more people.
>>>>>>>
>>>>>>> While the hpsa driver appears to be involved in some way, I'm sure if
>>>>>>> this is a related issue, but as of today's pull I'm getting another
>>>>>>> problem that causes my DL980 not to come up.
>>>>>>>
>>>>>>> *Massive* amounts of:
>>>>>>>
>>>>>>> DMAR:[fault reason 02] Present bit in context entry is clear
>>>>>>> dmar: DRHD: handling fault status reg 602
>>>>>>> dmar: DMAR:[DMA Read] Request device [02:00.0] fault addr 7f61e000
>>>>>>>
>>>>>>> Then:
>>>>>>>
>>>>>>> hpsa 0000:03:00.0: Controller lockup detected: 0xffff0000
>>>>>>> ...
>>>>>>> Workqueue: events hpsa_monitor_ctlr_worker [hpsa]
>>>>>>> ...
>>>>>>>
>>>>>>> Screenshot of the actual LOCKUP:
>>>>>>> http://stgolabs.net/hpsa-hard-lockup-3.14+.png
>>>>>>>
>>>>>>> While I haven't bisected, things worked fine until at least until commit
>>>>>>> 39de65aa2c3e (April 2nd).
>>>>>>>
>>>>>>> Any ideas?
>>>>>>
>>>>>> Well, it's either a DMA remapping issue or a hpsa one.  Your assertion
>>>>>> that everything worked fine until 39de65aa2c3e would tend to vindicate
>>>>>> hpsa,
>>>>
>>>> Hmm here you mean DMA, right?
>>>
>>> No, it vindicates the hpsa changes ... they don't seem to be causing
>>> problems until something goes wrong with dma remapping.
>>>
>>>>> because all the hpsa changes went in before that under
>>>>> Missing crucial info:
>>>>>
>>>>> commit 1a0b6abaea78f73d9bc0a2f6df2d9e4c917cade1
>>>>>
>>>>>> Merge: 3e75c6d b2bff6c
>>>>>> Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
>>>>>> Date:   Tue Apr 1 18:49:04 2014 -0700
>>>>>>
>>>>>>     Merge tag 'scsi-misc' of
>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
>>>>>>
>>>>>> can you revalidate that this commit works OK just to make sure?
>>>>
>>>> Ok so I don't see those DMA messages and system starts just fine. I'm
>>>> thinking perhaps something broke after the IO mmu stuff in commit
>>>> 3f583bc21977a608908b83d03ee2250426a5695c... could this be indirectly
>>>> causing the CPU stalls and just blame hpsa in the path as a side effect?
>>>>
>>>> /me goes out to try the commit.
>>>
>>> That's my guess.  The DMAR messages are DMA remapping issues caused in
>>> the IOMMU.  If I had to guess, I'd say the DMAR fault message is
>>> indicating the IOMMU is calling for a mapping address before it can
>>> satisfy the driver read request, which is causing the hang apparently in
>>> the hpsa driver.
>>>
>>> I've added linux-pci to the cc; I think they deal with iommu issues on
>>> x86.
>>
>> So that merge commit appears to be the culprit, I see both the DMA
>> messages and the lockup blaming hpsa...
> 
> My understanding so far (please correct me if I'm wrong):
> 
> 39de65aa2c3e OK ("Merge branch 'i2c/for-next'")
> 1a0b6abaea78 OK ("Merge tag 'scsi-misc'")
> 3f583bc21977 BAD ("Merge tag 'iommu-updates-v3.15'")
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