[dm-devel] AMD-Vi IO_PAGE_FAULTs and ata3.00: failed command: READ FPDMA QUEUED errors since Linux 4.0

[Andreas Hartmann]

On 07/28/2015 at 07:50 PM Mike Snitzer wrote:
> On Tue, Jul 28 2015 at  1:40pm -0400,
> Andreas Hartmann <andihartmann at 01019freenet.de> wrote:
> 
>> Hello!
>>
>> After long and heavy bisecting, I found this commit
>> "dm crypt: don't allocate pages for a partial request" [1] being the
>> cause of the ata errors and AMD-Vi IO_PAGE_FAULTs.
>>
>> That's the bisect I did with Linus' repository
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/
>>
>>
>> git bisect start
>> # good: [3466b547e37b988723dc93465b7cb06b4b1f731f] Merge branches 'pnp',
>> 'pm-cpuidle' and 'pm-cpufreq'
>> git bisect good 3466b547e37b988723dc93465b7cb06b4b1f731f
>> # bad: [cd50b70ccd5c87794ec28bfb87b7fba9961eb0ae] Merge tag
>> 'pm+acpi-3.20-rc1-3' of
>> git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
>> git bisect bad cd50b70ccd5c87794ec28bfb87b7fba9961eb0ae
>> # good: [27a22ee4c7d5839fd7e3e441c9d675c8a5c4c22c] Merge branch 'kbuild'
>> of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
>> git bisect good 27a22ee4c7d5839fd7e3e441c9d675c8a5c4c22c
>> # good: [c189cb8ef62832f33b6cf757350a0270532a1ad8] Merge tag
>> 'vfio-v3.20-rc1' of git://github.com/awilliam/linux-vfio
>> git bisect good c189cb8ef62832f33b6cf757350a0270532a1ad8
>> # good: [295324556c427d60b41668ab81a43f604533f456] Merge branch
>> 'i2c/for-3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
>> git bisect good 295324556c427d60b41668ab81a43f604533f456
>> # good: [1acd2de5facd7fbea499aea64a3a3d0ec7bb9b51] Merge branch
>> 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
>> git bisect good 1acd2de5facd7fbea499aea64a3a3d0ec7bb9b51
>> # good: [fde9f50f80fe89a9115b4bfa773017272597d85d] target: Add sanity
>> checks for DPO/FUA bit usage
>>
>> git bisect good fde9f50f80fe89a9115b4bfa773017272597d85d
>>
>>
>> # bad: [22aa66a3ee5b61e0f4a0bfeabcaa567861109ec3] dm snapshot: fix a
>> possible invalid memory access on unload
>>
>>
>> git bisect bad 22aa66a3ee5b61e0f4a0bfeabcaa567861109ec3
>>
>>
>> # bad: [7145c241a1bf2841952c3e297c4080b357b3e52d] dm crypt: avoid
>> deadlock in mempools
>>
>>
>> git bisect bad 7145c241a1bf2841952c3e297c4080b357b3e52d
>>
>>
>> # good: [37527b869207ad4c208b1e13967d69b8bba1fbf9] dm io: reject
>> unsupported DISCARD requests with EOPNOTSUPP
>>
>>
>> git bisect good 37527b869207ad4c208b1e13967d69b8bba1fbf9
>>
>>
>> # bad: [cf2f1abfbd0dba701f7f16ef619e4d2485de3366] dm crypt: don't
>> allocate pages for a partial request
>>
>>
>> git bisect bad cf2f1abfbd0dba701f7f16ef619e4d2485de3366
>>
>>
>> # good: [f3396c58fd8442850e759843457d78b6ec3a9589] dm crypt: use unbound
>> workqueue for request processing
>>
>> git bisect good f3396c58fd8442850e759843457d78b6ec3a9589
>>
>>
>> # first bad commit: [cf2f1abfbd0dba701f7f16ef619e4d2485de3366] dm crypt:
>> don't allocate pages for a partial request
>>
>>
>> How can I verify (e.g. w/ a patch to Linux 4.0.9) if this patch is
>> really the culprit?
>>
>> I'm heavily relying upon encryption:
>>
>> There are 3 disks:
>> - One 240 GB SSD (crypted LVM, swap and boot partition)
>> - Two SATA rotational 3 TB disks (WD ST3000DM001-1CH166, encrypted raid
>>   /dev/md0, LVM)
>> - All in all 29 logical volumes with xfs as filesystem (besides swap
>>   and bootpartition - the latter is ext4).
>>
>> The system is based on an AMD FX8350 processor (8 core) w/ 24GB RAM.
>> Motherboard is a Gigabyte GA-990XA-UD3. You can find a complete dmesg
>> output here [2].
>>
>>
>>
>> I would be glad to get some assistance!
> 
> Are your SATA devcies using NCQ?
> 
> Please see this dm-devl thread (and this post in particular):
> https://www.redhat.com/archives/dm-devel/2015-June/msg00005.html

As suggested, I applied these commits

f3396c58fd8442850e759843457d78b6ec3a9589,
cf2f1abfbd0dba701f7f16ef619e4d2485de3366,
7145c241a1bf2841952c3e297c4080b357b3e52d,
94f5e0243c48aa01441c987743dc468e2d6eaca2,
dc2676210c425ee8e5cb1bec5bc84d004ddf4179,
0f5d8e6ee758f7023e4353cca75d785b2d4f6abe,
b3c5fd3052492f1b8d060799d4f18be5a5438add

to 3.19.8 and the problem is exactly the same as described above.

I don't think that the problem is SSD related, because the ata3 error I
can see belongs to the rotational disk (ata1 would be the SSD).

The git bisect you mentioned is already done: "dm crypt: don't allocate
pages for a partial request" is the culprit.

Besides that: How can I disable ncq? Maybe a kernel patch, which
prevents enabling it because I need it on bootup before the disks are
accessed.



Thanks,
Andreas