[PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Tejun Heo]

Hello,

This is v2.  The only change from the last take[L] is

* Updated to reflect the earlier MS_CGROUPWB -> SB_I_CGROUPWB change.

This patchset implements cgroup writeback support for ext4, which is
enabled for writeback and ordered data modes.  This patchset contains
the following two patches.

 0001-ext4-replace-ext4_io_submit-io_op-with-io_wbc.patch
 0002-ext4-implement-cgroup-writeback-support.patch

0001 is a prep patch which replaces io_submit->io_op w/ ->io_wbc.
0002 implements cgroup writeback support.

This patchset is on top of

 [1] block/for-4.2/writeback
+[2] [PATCHSET] cgroup, writeback: misc updates for cgroup writeback support

and available on in the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-writeback-ext4

diffstat follows.  Thanks.

 fs/ext4/ext4.h    |    2 +-
 fs/ext4/page-io.c |    8 ++++++--
 fs/ext4/super.c   |    2 ++
 3 files changed, 9 insertions(+), 3 deletions(-)

--
tejun

[L] http://lkml.kernel.org/g/1434146543-26358-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
[1] git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-4.2/writeback
[2] http://lkml.kernel.org/g/1434494912-31043-1-git-send-email-tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org

[PATCH 1/2] ext4: replace ext4_io_submit->io_op with ->io_wbc

[Tejun Heo]

ext4_io_submit_init() takes the pointer to writeback_control to test
its sync_mode and determine between WRITE and WRITE_SYNC and records
the result in ->io_op.  This patch makes it record the pointer
directly and moves the test to ext4_io_submit().

This doesn't cause any noticeable differences now but having
writeback_control available throughout IO submission path will be
depended upon by the planned cgroup writeback support.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: linux-ext4@vger.kernel.org
---
 fs/ext4/ext4.h    | 2 +-
 fs/ext4/page-io.c | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 009a059..74a4923 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -191,7 +191,7 @@ typedef struct ext4_io_end {
 } ext4_io_end_t;
 
 struct ext4_io_submit {
-	int			io_op;
+	struct writeback_control *io_wbc;
 	struct bio		*io_bio;
 	ext4_io_end_t		*io_end;
 	sector_t		io_next_block;
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index c5d81e8..3f80cb2 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -357,8 +357,10 @@ void ext4_io_submit(struct ext4_io_submit *io)
 	struct bio *bio = io->io_bio;
 
 	if (bio) {
+		int io_op = io->io_wbc->sync_mode == WB_SYNC_ALL ?
+			    WRITE_SYNC : WRITE;
 		bio_get(io->io_bio);
-		submit_bio(io->io_op, io->io_bio);
+		submit_bio(io_op, io->io_bio);
 		bio_put(io->io_bio);
 	}
 	io->io_bio = NULL;
@@ -367,7 +369,7 @@ void ext4_io_submit(struct ext4_io_submit *io)
 void ext4_io_submit_init(struct ext4_io_submit *io,
 			 struct writeback_control *wbc)
 {
-	io->io_op = (wbc->sync_mode == WB_SYNC_ALL ?  WRITE_SYNC : WRITE);
+	io->io_wbc = wbc;
 	io->io_bio = NULL;
 	io->io_end = NULL;
 }
-- 
2.4.3

Re: [PATCH 1/2] ext4: replace ext4_io_submit->io_op with ->io_wbc

[Theodore Ts'o]

On Tue, Jun 16, 2015 at 06:53:12PM -0400, Tejun Heo wrote:
> ext4_io_submit_init() takes the pointer to writeback_control to test
> its sync_mode and determine between WRITE and WRITE_SYNC and records
> the result in ->io_op.  This patch makes it record the pointer
> directly and moves the test to ext4_io_submit().
> 
> This doesn't cause any noticeable differences now but having
> writeback_control available throughout IO submission path will be
> depended upon by the planned cgroup writeback support.
> 
> Signed-off-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Cc: "Theodore Ts'o" <tytso-3s7WtUTddSA@public.gmane.org>
> Cc: Andreas Dilger <adilger.kernel-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org>
> Cc: linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

Thanks, applied.

						- Ted

[PATCH 2/2] ext4: implement cgroup writeback support

[Tejun Heo]

For ordered and writeback data modes, all data IOs go through
ext4_io_submit.  This patch adds cgroup writeback support by invoking
wbc_init_bio() from io_submit_init_bio() and wbc_account_io() in
io_submit_add_bh().  Journal data which is written by jbd2 worker is
left alone by this patch and will always be written out from the root
cgroup.

ext4_fill_super() is updated to set MS_CGROUPWB when data mode is
either ordered or writeback.  In journaled data mode, most IOs become
synchronous through the journal and enabling cgroup writeback support
doesn't make much sense or difference.  Journaled data mode is left
alone.

Lightly tested with sequential data write workload.  Behaves as
expected.

v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: linux-ext4@vger.kernel.org
---
 fs/ext4/page-io.c | 2 ++
 fs/ext4/super.c   | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 3f80cb2..c56ba7b 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -383,6 +383,7 @@ static int io_submit_init_bio(struct ext4_io_submit *io,
 	bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES));
 	if (!bio)
 		return -ENOMEM;
+	wbc_init_bio(io->io_wbc, bio);
 	bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
 	bio->bi_bdev = bh->b_bdev;
 	bio->bi_end_io = ext4_end_bio;
@@ -411,6 +412,7 @@ static int io_submit_add_bh(struct ext4_io_submit *io,
 	ret = bio_add_page(io->io_bio, page, bh->b_size, bh_offset(bh));
 	if (ret != bh->b_size)
 		goto submit_and_retry;
+	wbc_account_io(io->io_wbc, page, bh->b_size);
 	io->io_next_block++;
 	return 0;
 }
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 56b8bb7..3ad1eb4 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3623,6 +3623,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		}
 		if (test_opt(sb, DELALLOC))
 			clear_opt(sb, DELALLOC);
+	} else {
+		sb->s_iflags |= SB_I_CGROUPWB;
 	}
 
 	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
-- 
2.4.3

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Theodore Ts'o]

On Tue, Jun 16, 2015 at 06:53:13PM -0400, Tejun Heo wrote:
> For ordered and writeback data modes, all data IOs go through
> ext4_io_submit.  This patch adds cgroup writeback support by invoking
> wbc_init_bio() from io_submit_init_bio() and wbc_account_io() in
> io_submit_add_bh().  Journal data which is written by jbd2 worker is
> left alone by this patch and will always be written out from the root
> cgroup.
> 
> ext4_fill_super() is updated to set MS_CGROUPWB when data mode is
> either ordered or writeback.  In journaled data mode, most IOs become
> synchronous through the journal and enabling cgroup writeback support
> doesn't make much sense or difference.  Journaled data mode is left
> alone.
> 
> Lightly tested with sequential data write workload.  Behaves as
> expected.
> 
> v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
> 
> Signed-off-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Cc: "Theodore Ts'o" <tytso-3s7WtUTddSA@public.gmane.org>
> Cc: Andreas Dilger <adilger.kernel-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org>
> Cc: linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

Thanks, applied.

						- Ted

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Artem Bityutskiy]

On Tue, 2015-07-21 at 23:56 -0400, Theodore Ts'o wrote:
> > v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
> > 
> > Signed-off-by: Tejun Heo <tj@kernel.org>
> > Cc: "Theodore Ts'o" <tytso@mit.edu>
> > Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> > Cc: linux-ext4@vger.kernel.org
> 
> Thanks, applied.

Hi, this patch introduces a regression - a major one, I'd say.

Symptoms: copy a bunch of file, run sync, then run 'reboot', and after
you boot up the copied files are corrupted. So basically the user
-visible symptom is that 'sync' does not work.

I quite an effort to bisect it, but it led me to this patch.

If I take the latest upstream (v4.3-rc2+), and revert this patch:

001e4a8 ext4: imlpement cgroup writeback support

then the problem goes away - files are not corrupted after reboot.

I use ext4 on top of a "bare" partition, no LVM or dm layers involved.

I use Fedora 22 with all the latest package updates, and I only change
the kernel there.

The corruption seems to be that the start with a bunch of zeroes
instead of the real data, but I did not check carefully, looked only at
one file briefly.

Artem.

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Artem Bityutskiy]

On Wed, 2015-09-23 at 15:49 +0300, Artem Bityutskiy wrote:
> On Tue, 2015-07-21 at 23:56 -0400, Theodore Ts'o wrote:
> > > v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
> > > 
> > > Signed-off-by: Tejun Heo <tj@kernel.org>
> > > Cc: "Theodore Ts'o" <tytso@mit.edu>
> > > Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> > > Cc: linux-ext4@vger.kernel.org
> > 
> > Thanks, applied.
> 
> Hi, this patch introduces a regression - a major one, I'd say.
> 
> Symptoms: copy a bunch of file, run sync, then run 'reboot', and
> after
> you boot up the copied files are corrupted. So basically the user
> -visible symptom is that 'sync' does not work.

Just FYI, this is the issue I briefly reported last Fri:

https://lkml.org/lkml/2015/9/18/640

Artem.

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Theodore Ts'o]

On Wed, Sep 23, 2015 at 04:50:53PM +0300, Artem Bityutskiy wrote:
> On Wed, 2015-09-23 at 15:49 +0300, Artem Bityutskiy wrote:
> > On Tue, 2015-07-21 at 23:56 -0400, Theodore Ts'o wrote:
> > > > v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
> > > > 
> > > > Signed-off-by: Tejun Heo <tj@kernel.org>
> > > > Cc: "Theodore Ts'o" <tytso@mit.edu>
> > > > Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> > > > Cc: linux-ext4@vger.kernel.org
> > > 
> > > Thanks, applied.
> > 
> > Hi, this patch introduces a regression - a major one, I'd say.
> > 
> > Symptoms: copy a bunch of file, run sync, then run 'reboot', and
> > after
> > you boot up the copied files are corrupted. So basically the user
> > -visible symptom is that 'sync' does not work.
> 
> Just FYI, this is the issue I briefly reported last Fri:
> 
> https://lkml.org/lkml/2015/9/18/640

Also note this performance regression reported by Dexuan Cui

	https://lkml.org/lkml/2015/9/23/333

I didn't notice these problems since I my userspace doesn't enable the
writeback cgroup.  (In fact I don't know how to do it using Debian
Jessie.)

Tejun, can you please take a look at this and give me a
recommendation?  I'm willing to wait a day or two while we try to fix
the problem, but past that point I'd like to have a fix or revert this
commit before Linus releases the next -rc release.

						- Ted

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Tejun Heo]

Hello, Ted.

On Wed, Sep 23, 2015 at 01:02:38PM -0400, Theodore Ts'o wrote:
> Also note this performance regression reported by Dexuan Cui
> 
> 	https://lkml.org/lkml/2015/9/23/333
> 
> I didn't notice these problems since I my userspace doesn't enable the
> writeback cgroup.  (In fact I don't know how to do it using Debian
> Jessie.)

The thing is I don't think they're either.

> Tejun, can you please take a look at this and give me a
> recommendation?  I'm willing to wait a day or two while we try to fix
> the problem, but past that point I'd like to have a fix or revert this
> commit before Linus releases the next -rc release.

Yeap, looking at them both.  Will update as soon as I know more.

Thanks.

-- 
tejun

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Chris Mason]

On Wed, Sep 23, 2015 at 03:49:12PM +0300, Artem Bityutskiy wrote:
> On Tue, 2015-07-21 at 23:56 -0400, Theodore Ts'o wrote:
> > > v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
> > > 
> > > Signed-off-by: Tejun Heo <tj@kernel.org>
> > > Cc: "Theodore Ts'o" <tytso@mit.edu>
> > > Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> > > Cc: linux-ext4@vger.kernel.org
> > 
> > Thanks, applied.
> 
> Hi, this patch introduces a regression - a major one, I'd say.
> 
> Symptoms: copy a bunch of file, run sync, then run 'reboot', and after
> you boot up the copied files are corrupted. So basically the user
> -visible symptom is that 'sync' does not work.

Hi Artem,

Are you doing a hard shutdown (reboot -nf)?  If you're doing a friendly
shutdown, is the FS unmounting cleanly?

> 
> I quite an effort to bisect it, but it led me to this patch.

I bet it was a long bisect.  Trying to see if the same patch to btrfs
has similar impacts.

-chris

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Chris Mason]

On Wed, Sep 23, 2015 at 08:41:25PM +0300, Artem Bityutskiy wrote:
>    Hi
> 
>    $ sync
>    $ reboot

If this is case, it should be possible to reproduce with:

cp a bunch of stuff to /ext4
unmount /ext4
mount ext4
compare data

If you're not getting a clean unmount of the test FS during the reboot,
its a different test.  Trying to reproduce here, so far its clean.
Could you please double check for failed unmounts?

Thanks,
Chris

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Theodore Ts'o]

Artem,

Can you (or someone on the cgroups list, perhaps) give more details
about how Fedora 22 sets up groups?

Unfortunately apparently no one has gotten an official Fedora image
for Google Compute Engine so it's a bit of a pain for me to reproduce
the problem.  (I suppose I could use AWS, but all of my test
infrastructure uses GCE, and I'd really rather not have to install a
Java Runtime on my laptop. :-)

Or can you reproduce this problem on Debian Jessie?

Thanks,

					- Ted

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Artem Bityutskiy]

On Wed, Sep 23, 2015 at 9:24 PM, Theodore Ts'o <tytso-3s7WtUTddSA@public.gmane.org> wrote:
> Artem,
>
> Can you (or someone on the cgroups list, perhaps) give more details
> about how Fedora 22 sets up groups?
>
> Unfortunately apparently no one has gotten an official Fedora image
> for Google Compute Engine so it's a bit of a pain for me to reproduce
> the problem.  (I suppose I could use AWS, but all of my test
> infrastructure uses GCE, and I'd really rather not have to install a
> Java Runtime on my laptop. :-)

[ My apologies for top posting and for sending HTML e-mails which do
not get through vger.
I am using gmail web interface, and just learned how to send plain
text from here. So re-sending
my longer answer. ]

Hi Ted, Chris, Tejun, all,

quick and probably messy reply before I go to sleep...

I can give more information tomorrow.  But one note - It would be helpful to get
questions like "send us the output of this command" rather than "what are the
cgroups you are in", because I am not fluent with cgroups. IOW, more specific
questions are welcome.

Some more about my setup. I have an number of testboxes, which are 1/2/4-socket
servers. I compile the kernel for them on a separate worker box. Then I copy the
kernel binary to /boot, and the modules to /lib/modules, then run
'sync' and then
reboot to reboot to the new kernel. And vrey often many module files
are corrupted.
They won't load because of majic/crc mismatches.

I copy stuff over scp. Well, this is not exactly scp, but rather a
Python 'scp' module,
which is based on the 'paramiko' module. But I think this should not matter.

Anyway, may be there are some cgroups related with scp/ssh sessions or
/lib/modules
in Fedora 22?

Also note, I tried to be careful during bisecting, I used 4 servers in
parallel, and
did 5 reboot tests on each of them. With this patch reverted all 4
boxes survive 5
reboots just fine. Without this patch reverted, each fail 1-3 reboots.

And, by the way, I forgot this detail - I cut AC power off at the end,
then put it back
on after a 20 seconds delay. I mean, this is a clean reboot, but with
power cut at the
end. So the process is this:

1. I run 'sync' on the box remotely over ssh
2. I run 'reboot'  on the box remotely over ssh, the ssh connection
gets closed at this point
3. I ping the box, and keep doing this until it is stops echoing back
4. I wait several seconds, and then just cut the AC power off. The
wall socket power is off.

So if there was something in, say, SSD cache which was not synced, it
is gone too.

May be this patch reveals an existing issue. My setup has been stable
with 4.2 and many
previous kernels, and it only fails with 4.3-rcX, and my bisecting
lead to this patch.

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Theodore Ts'o]

On Wed, Sep 23, 2015 at 10:47:16PM +0300, Artem Bityutskiy wrote:
> And, by the way, I forgot this detail - I cut AC power off at the
> end, then put it back on after a 20 seconds delay. I mean, this is a
> clean reboot, but with power cut at the end.

Is this reproducible without the power cut?  And what model SSD are
you using, and are you sure that it has Power Loss Protection (many
SSD vendors use power loss protection as the price discrimination
feature between consumer-grade SSD and enterprise-grade SSD's that
cost $$$).  If this problem wasn't showing up with 4.2, and is only
failing with 4.3-rcX, then it might not be a hardware issue --- but
it's also possible that there was a timing issue which was hiding a
hardware problem.  So for the purposes of debugging, removing the
power cut from the set of variables is a useful thing to do.

      	       	       	  	       	 	- Ted

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Artem Bityutskiy]

On Wed, 2015-09-23 at 16:48 -0400, Theodore Ts'o wrote:
> On Wed, Sep 23, 2015 at 10:47:16PM +0300, Artem Bityutskiy wrote:
> > And, by the way, I forgot this detail - I cut AC power off at the
> > end, then put it back on after a 20 seconds delay. I mean, this is
> > a
> > clean reboot, but with power cut at the end.
> 
> Is this reproducible without the power cut?  And what model SSD are
> you using, and are you sure that it has Power Loss Protection (many
> SSD vendors use power loss protection as the price discrimination
> feature between consumer-grade SSD and enterprise-grade SSD's that
> cost $$$).  If this problem wasn't showing up with 4.2, and is only
> failing with 4.3-rcX, then it might not be a hardware issue --- but
> it's also possible that there was a timing issue which was hiding a
> hardware problem.  So for the purposes of debugging, removing the
> power cut from the set of variables is a useful thing to do.

Ted, you are right that the problem may be anywhere, but since Tejun's
patch fixes it, I decided to not spend time on testing without AC power
cuts.

But I checked and on of my boxes uses an HDD, and it shows the same
problem, which makes the theory of imperfect SSD firmware being
involved less likely.

Thanks,
Artem.

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Tejun Heo]

Hello, Artem.

On Wed, Sep 23, 2015 at 08:41:25PM +0300, Artem Bityutskiy wrote:
> $ sync
> $ reboot
> 
> is exactly the sequence.

Can you please test with 4.3-rc2 and see whether the issue is
reproducible?  The multi-wb wait logic rewrite was merged during rc1
and I'm wondering whether this is a bug in the old implementation.

Thanks.

-- 
tejun

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Tejun Heo]

Hello, Artem.

On Wed, Sep 23, 2015 at 03:49:12PM +0300, Artem Bityutskiy wrote:
> I use Fedora 22 with all the latest package updates, and I only change
> the kernel there.

What's your cgroup setup like?  Are you trying out the unified
hierarchy?  Given that you didn't mention that, I'm guessing you
aren't which makes me pretty head-scratchy because I don't see how the
actual behavior would change depending on that flag.  I'll dig more.

Thanks.

-- 
tejun

Re: [PATCH 2/2] ext4: implement cgroup writeback support

[Tejun Heo]

On Wed, Sep 23, 2015 at 02:09:34PM -0400, Tejun Heo wrote:
> Hello, Artem.
> 
> On Wed, Sep 23, 2015 at 03:49:12PM +0300, Artem Bityutskiy wrote:
> > I use Fedora 22 with all the latest package updates, and I only change
> > the kernel there.
> 
> What's your cgroup setup like?  Are you trying out the unified
> hierarchy?  Given that you didn't mention that, I'm guessing you
> aren't which makes me pretty head-scratchy because I don't see how the
> actual behavior would change depending on that flag.  I'll dig more.

Ugh... never mind.  I spotted what I did wrong.  The sync thing still
needs figuring out (it still should have worked) but fixing the
regression should be easy.  Will update soon.

Thanks.

-- 
tejun

[PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

inode_cgwb_enabled() gates cgroup writeback support.  If it returns
true, each inode is attached to the corresponding memory domain which
gets mapped to io domain.  It currently only tests whether the
filesystem and bdi support cgroup writeback; however, cgroup writeback
support doesn't work on traditional hierarchies and thus it should
also test whether memcg and iocg are on the default hierarchy.

This caused traditional hierarchy setups to hit the cgroup writeback
path inadvertently and ended up creating separate writeback domains
for each memcg and mapping them all to the root iocg uncovering a
couple issues in the cgroup writeback path.

cgroup writeback was never meant to be enabled on traditional
hierarchies.  Make inode_cgwb_enabled() test whether both memcg and
iocg are on the default hierarchy.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Artem Bityutskiy <dedekind1@gmail.com>
Reported-by: Dexuan Cui <decui@microsoft.com>
Link: http://lkml.kernel.org/g/1443012552.19983.209.camel@gmail.com
Link: http://lkml.kernel.org/g/f30d4a6aa8a546ff88f73021d026a453@SIXPR30MB031.064d.mgd.msft.net
---
Hello,

So, this should make the regression go away.  It doesn't fix the
underlying bugs but they shouldn't get triggered by people not
experimenting with cgroup.

I'm gonna keep digging the underlying issues but this should make the
regressions go away.  If it's okay, I think it'd be better to route
this through cgroup/for-4.3-fixes as it's gonna cause a conflict with
for-4.4 branch and handling the merge there is easier.

Thanks.

 include/linux/backing-dev.h |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 5a5d79e..d5eb4ad1 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -13,6 +13,7 @@
 #include <linux/sched.h>
 #include <linux/blkdev.h>
 #include <linux/writeback.h>
+#include <linux/memcontrol.h>
 #include <linux/blk-cgroup.h>
 #include <linux/backing-dev-defs.h>
 #include <linux/slab.h>
@@ -252,13 +253,19 @@ int inode_congested(struct inode *inode, int cong_bits);
  * @inode: inode of interest
  *
  * cgroup writeback requires support from both the bdi and filesystem.
- * Test whether @inode has both.
+ * Also, both memcg and iocg have to be on the default hierarchy.  Test
+ * whether all conditions are met.
+ *
+ * Note that the test result may change dynamically on the same inode
+ * depending on how memcg and iocg are configured.
  */
 static inline bool inode_cgwb_enabled(struct inode *inode)
 {
 	struct backing_dev_info *bdi = inode_to_bdi(inode);
 
-	return bdi_cap_account_dirty(bdi) &&
+	return cgroup_on_dfl(mem_cgroup_root_css->cgroup) &&
+		cgroup_on_dfl(blkcg_root_css->cgroup) &&
+		bdi_cap_account_dirty(bdi) &&
 		(bdi->capabilities & BDI_CAP_CGROUP_WRITEBACK) &&
 		(inode->i_sb->s_iflags & SB_I_CGROUPWB);
 }

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Artem Bityutskiy]

On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> Hello,
> 
> So, this should make the regression go away.  It doesn't fix the
> underlying bugs but they shouldn't get triggered by people not
> experimenting with cgroup.

Tejun,

this hits the nail on the head and makes the problem go away.

I've tested the tip of Linuses tree (v4.3-rc2+) plus this patch - no
data corruption after reboots.

I've tested just the tip of Linuses tree (v4.3-rc2+) without this
patch, and I do see the data corruption after reboots.

Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Artem.

RE: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Dexuan Cui]

> On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> > Hello,
> >
> > So, this should make the regression go away.  It doesn't fix the
> > underlying bugs but they shouldn't get triggered by people not
> > experimenting with cgroup.
> 
> Tejun,
> 
> this hits the nail on the head and makes the problem go away.
> 
> I've tested the tip of Linuses tree (v4.3-rc2+) plus this patch - no
> data corruption after reboots.
> 
> I've tested just the tip of Linuses tree (v4.3-rc2+) without this
> patch, and I do see the data corruption after reboots.
> 
> Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
> 
> Artem.

I can confirm the patch fixes my "slow write" issue too.

Tested-by: Dexuan Cui <decui@microsoft.com>

-- Dexuan

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

Hello,

On Thu, Sep 24, 2015 at 08:40:18AM +0000, Dexuan Cui wrote:
> I can confirm the patch fixes my "slow write" issue too.
> 
> Tested-by: Dexuan Cui <decui-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>

Yeah, this should make it go away w/o using cgroup writeback
explicitly; however, I think the proper solution for cgroup writeback
is moving bandwidth estimation from memory domain to io domain so that
two separate bw estimations wouldn't interfere with each other leading
to unexpected outcomes.  I'll work on the changes.

Thanks.

-- 
tejun

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

Hello,

On Thu, Sep 24, 2015 at 04:47:36PM -0400, Tejun Heo wrote:
> On Thu, Sep 24, 2015 at 08:40:18AM +0000, Dexuan Cui wrote:
> > I can confirm the patch fixes my "slow write" issue too.
> > 
> > Tested-by: Dexuan Cui <decui@microsoft.com>
> 
> Yeah, this should make it go away w/o using cgroup writeback
> explicitly; however, I think the proper solution for cgroup writeback
> is moving bandwidth estimation from memory domain to io domain so that
> two separate bw estimations wouldn't interfere with each other leading
> to unexpected outcomes.  I'll work on the changes.

So, this one actually turns out to be mostly caused by enabling cgroup
writeback when it shouldn't be.  balance_dirty_pages() ended up
looking at a different bdi_writeback from the actual writeback path so
the throttling was completley off, so making sure that cgroup
writeback doesn't get turned on traditional hierarchies is the right
solution here.

While auditing the behavior, I noticed a couple non-critical issues.
Will post patches to fix them soon.

Thanks.

-- 
tejun

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

Hello, Artem.

On Thu, Sep 24, 2015 at 11:09:46AM +0300, Artem Bityutskiy wrote:
> On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> > So, this should make the regression go away.  It doesn't fix the
> > underlying bugs but they shouldn't get triggered by people not
> > experimenting with cgroup.
> 
> this hits the nail on the head and makes the problem go away.

Yeah but there still is an underlying problem here.  I've been going
through the sync path today but can't trigger or spot anything wrong.
Can you please apply the patch at the end of this mail, trigger the
failure and report the kernel log?

Thanks a lot.

---
 fs/fs-writeback.c           |  154 ++++++++++++++++++++++++++++++++++++++++++--
 fs/inode.c                  |    1 
 include/linux/backing-dev.h |   20 +++++
 include/linux/fs.h          |    2 
 mm/backing-dev.c            |    2 
 5 files changed, 171 insertions(+), 8 deletions(-)

--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -101,7 +101,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(wbc_writepa
 
 static bool wb_io_lists_populated(struct bdi_writeback *wb)
 {
-	if (wb_has_dirty_io(wb)) {
+	if (test_bit(WB_has_dirty_io, &wb->state)) {
 		return false;
 	} else {
 		set_bit(WB_has_dirty_io, &wb->state);
@@ -763,6 +763,15 @@ static long wb_split_bdi_pages(struct bd
 		return DIV_ROUND_UP_ULL((u64)nr_pages * this_bw, tot_bw);
 }
 
+extern spinlock_t cgwb_lock;
+
+struct split_work_dbg {
+	DECLARE_BITMAP(all_wbs, 8192);
+	DECLARE_BITMAP(iterated_wbs, 8192);
+	DECLARE_BITMAP(written_wbs, 8192);
+	DECLARE_BITMAP(sync_wbs, 8192);
+};
+
 /**
  * bdi_split_work_to_wbs - split a wb_writeback_work to all wb's of a bdi
  * @bdi: target backing_dev_info
@@ -776,11 +785,25 @@ static long wb_split_bdi_pages(struct bd
  */
 static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
 				  struct wb_writeback_work *base_work,
-				  bool skip_if_busy)
+				  bool skip_if_busy, struct split_work_dbg *dbg)
 {
 	int next_memcg_id = 0;
 	struct bdi_writeback *wb;
 	struct wb_iter iter;
+	struct radix_tree_iter riter;
+	void **slot;
+
+	if (dbg) {
+		spin_lock_irq(&cgwb_lock);
+		set_bit(bdi->wb.memcg_css->id, dbg->all_wbs);
+		bdi->wb.last_comp_gen = bdi->wb.comp_gen;
+		radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &riter, 0) {
+			wb = *slot;
+			set_bit(wb->memcg_css->id, dbg->all_wbs);
+			wb->last_comp_gen = wb->comp_gen;
+		}
+		spin_unlock_irq(&cgwb_lock);
+	}
 
 	might_sleep();
 restart:
@@ -791,6 +814,9 @@ restart:
 		struct wb_writeback_work *work;
 		long nr_pages;
 
+		if (dbg)
+			set_bit(wb->memcg_css->id, dbg->iterated_wbs);
+
 		/* SYNC_ALL writes out I_DIRTY_TIME too */
 		if (!wb_has_dirty_io(wb) &&
 		    (base_work->sync_mode == WB_SYNC_NONE ||
@@ -799,6 +825,9 @@ restart:
 		if (skip_if_busy && writeback_in_progress(wb))
 			continue;
 
+		if (dbg)
+			set_bit(wb->memcg_css->id, dbg->written_wbs);
+
 		nr_pages = wb_split_bdi_pages(wb, base_work->nr_pages);
 
 		work = kmalloc(sizeof(*work), GFP_ATOMIC);
@@ -817,6 +846,8 @@ restart:
 		work->auto_free = 0;
 		work->done = &fallback_work_done;
 
+		if (dbg)
+			set_bit(wb->memcg_css->id, dbg->sync_wbs);
 		wb_queue_work(wb, work);
 
 		next_memcg_id = wb->memcg_css->id + 1;
@@ -1425,6 +1456,9 @@ static long writeback_sb_inodes(struct s
 			break;
 		}
 
+		inode->i_dbg_marker = 0;
+		inode->i_dbg_marker2 = 0;
+
 		/*
 		 * Don't bother with new inodes or inodes being freed, first
 		 * kind does not need periodic writeout yet, and for the latter
@@ -1515,6 +1549,7 @@ static long writeback_sb_inodes(struct s
 				break;
 		}
 	}
+
 	return wrote;
 }
 
@@ -1574,6 +1609,28 @@ static long writeback_inodes_wb(struct b
 	return nr_pages - work.nr_pages;
 }
 
+static int inode_which_wb_io_list(struct inode *inode, struct backing_dev_info *bdi)
+{
+	struct bdi_writeback *wb = inode->i_wb ?: &bdi->wb;
+	struct inode *pos;
+
+	if (list_empty(&inode->i_io_list))
+		return 0;
+	list_for_each_entry(pos, &wb->b_dirty, i_io_list)
+		if (pos == inode)
+			return 1;
+	list_for_each_entry(pos, &wb->b_io, i_io_list)
+		if (pos == inode)
+			return 2;
+	list_for_each_entry(pos, &wb->b_more_io, i_io_list)
+		if (pos == inode)
+			return 3;
+	list_for_each_entry(pos, &wb->b_dirty_time, i_io_list)
+		if (pos == inode)
+			return 4;
+	return 5;
+}
+
 /*
  * Explicit flushing or periodic writeback of "old" data.
  *
@@ -1604,6 +1661,16 @@ static long wb_writeback(struct bdi_writ
 
 	blk_start_plug(&plug);
 	spin_lock(&wb->list_lock);
+
+	list_for_each_entry(inode, &wb->b_dirty, i_io_list)
+		inode->i_dbg_marker2 = 1;
+	list_for_each_entry(inode, &wb->b_io, i_io_list)
+		inode->i_dbg_marker2 = 2;
+	list_for_each_entry(inode, &wb->b_more_io, i_io_list)
+		inode->i_dbg_marker2 = 3;
+	list_for_each_entry(inode, &wb->b_dirty_time, i_io_list)
+		inode->i_dbg_marker2 = 4;
+
 	for (;;) {
 		/*
 		 * Stop writeback when nr_pages has been consumed
@@ -1681,6 +1748,24 @@ static long wb_writeback(struct bdi_writ
 			spin_lock(&wb->list_lock);
 		}
 	}
+
+	if (work->sync_mode == WB_SYNC_ALL) {
+		list_for_each_entry(inode, &wb->b_dirty, i_io_list)
+			if (inode->i_dbg_marker2)
+				printk("XXX wb_writeback: inode %lu marker2=%d on b_dirty\n",
+				       inode->i_ino, inode->i_dbg_marker2);
+		list_for_each_entry(inode, &wb->b_io, i_io_list)
+			printk("XXX wb_writeback: inode %lu marker2=%d on b_io\n",
+			       inode->i_ino, inode->i_dbg_marker2);
+		list_for_each_entry(inode, &wb->b_more_io, i_io_list)
+			printk("XXX wb_writeback: inode %lu marker2=%d on b_more_io\n",
+			       inode->i_ino, inode->i_dbg_marker2);
+		list_for_each_entry(inode, &wb->b_dirty_time, i_io_list)
+			if (inode->i_dbg_marker2)
+				printk("XXX wb_writeback: inode %lu marker2=%d on b_dirty_time\n",
+				       inode->i_ino, inode->i_dbg_marker2);
+	}
+
 	spin_unlock(&wb->list_lock);
 	blk_finish_plug(&plug);
 
@@ -1785,8 +1870,11 @@ static long wb_do_writeback(struct bdi_w
 
 		if (work->auto_free)
 			kfree(work);
-		if (done && atomic_dec_and_test(&done->cnt))
-			wake_up_all(&wb->bdi->wb_waitq);
+		if (done) {
+			wb->comp_gen++;
+			if (atomic_dec_and_test(&done->cnt))
+				wake_up_all(&wb->bdi->wb_waitq);
+		}
 	}
 
 	/*
@@ -1976,6 +2064,9 @@ void __mark_inode_dirty(struct inode *in
 
 	trace_writeback_mark_inode_dirty(inode, flags);
 
+	WARN_ON_ONCE(!(sb->s_flags & MS_LAZYTIME) &&
+		     !list_empty(&inode_to_bdi(inode)->wb.b_dirty_time));
+
 	/*
 	 * Don't do this for I_DIRTY_PAGES - that doesn't actually
 	 * dirty the inode itself
@@ -2165,7 +2256,7 @@ static void __writeback_inodes_sb_nr(str
 		return;
 	WARN_ON(!rwsem_is_locked(&sb->s_umount));
 
-	bdi_split_work_to_wbs(sb->s_bdi, &work, skip_if_busy);
+	bdi_split_work_to_wbs(sb->s_bdi, &work, skip_if_busy, NULL);
 	wb_wait_for_completion(bdi, &done);
 }
 
@@ -2257,6 +2348,10 @@ void sync_inodes_sb(struct super_block *
 		.for_sync	= 1,
 	};
 	struct backing_dev_info *bdi = sb->s_bdi;
+	static DEFINE_MUTEX(dbg_mutex);
+	static struct split_work_dbg dbg;
+	static DECLARE_BITMAP(tmp_bitmap, 8192);
+	struct inode *inode;
 
 	/*
 	 * Can't skip on !bdi_has_dirty() because we should wait for !dirty
@@ -2267,9 +2362,56 @@ void sync_inodes_sb(struct super_block *
 		return;
 	WARN_ON(!rwsem_is_locked(&sb->s_umount));
 
-	bdi_split_work_to_wbs(bdi, &work, false);
+	mutex_lock(&dbg_mutex);
+
+	printk("XXX SYNCING %d:%d\n", MAJOR(sb->s_dev), MINOR(sb->s_dev));
+
+	bitmap_zero(dbg.all_wbs, 8192);
+	bitmap_zero(dbg.iterated_wbs, 8192);
+	bitmap_zero(dbg.written_wbs, 8192);
+	bitmap_zero(dbg.sync_wbs, 8192);
+
+	spin_lock(&sb->s_inode_list_lock);
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+		spin_lock(&inode->i_lock);
+		inode->i_dbg_marker = inode_which_wb_io_list(inode, bdi);
+		spin_unlock(&inode->i_lock);
+	}
+	spin_unlock(&sb->s_inode_list_lock);
+
+	bdi_split_work_to_wbs(bdi, &work, false, &dbg);
 	wb_wait_for_completion(bdi, &done);
 
+	spin_lock(&sb->s_inode_list_lock);
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+		struct bdi_writeback *wb = inode->i_wb ?: &bdi->wb;
+
+		if (!inode->i_dbg_marker)
+			continue;
+
+		spin_lock_irq(&wb->list_lock);
+		if (inode->i_state & I_DIRTY_ALL)
+			printk("XXX sync_inodes_sb(%d:%d): dirty inode %lu skipped, wb=%d comp_gen=%d->%d which=%d->%d i_state=0x%lx\n",
+			       MAJOR(sb->s_dev), MINOR(sb->s_dev), inode->i_ino,
+			       wb->memcg_css->id, wb->last_comp_gen, wb->comp_gen,
+			       inode->i_dbg_marker, inode_which_wb_io_list(inode, bdi),
+			       inode->i_state);
+		spin_unlock_irq(&wb->list_lock);
+	}
+	spin_unlock(&sb->s_inode_list_lock);
+
+	bitmap_andnot(tmp_bitmap, dbg.all_wbs, dbg.iterated_wbs, 8192);
+	if (!bitmap_empty(tmp_bitmap, 8192))
+		printk("XXX sync_inodes_sb(%d:%d): iteration skipped %8192pbl\n",
+		       MAJOR(sb->s_dev), MINOR(sb->s_dev), tmp_bitmap);
+
+	printk("XXX all_wbs      = %8192pbl\n", dbg.all_wbs);
+	printk("XXX iterated_wbs = %8192pbl\n", dbg.iterated_wbs);
+	printk("XXX written_wbs  = %8192pbl\n", dbg.written_wbs);
+	printk("XXX sync_wbs     = %8192pbl\n", dbg.sync_wbs);
+
+	mutex_unlock(&dbg_mutex);
+
 	wait_sb_inodes(sb);
 }
 EXPORT_SYMBOL(sync_inodes_sb);
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -183,6 +183,7 @@ int inode_init_always(struct super_block
 #endif
 	inode->i_flctx = NULL;
 	this_cpu_inc(nr_inodes);
+	inode->i_dbg_marker = 0;
 
 	return 0;
 out:
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -38,7 +38,25 @@ extern struct workqueue_struct *bdi_wq;
 
 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)
 {
-	return test_bit(WB_has_dirty_io, &wb->state);
+	bool ret = test_bit(WB_has_dirty_io, &wb->state);
+	long tot_write_bw = atomic_long_read(&wb->bdi->tot_write_bandwidth);
+
+	if (!ret && (!list_empty(&wb->b_dirty) || !list_empty(&wb->b_io) ||
+		     !list_empty(&wb->b_more_io))) {
+		const char *name = wb->bdi->dev ? dev_name(wb->bdi->dev) : "UNK";
+
+		pr_err("wb_has_dirty_io: ERR %s has_dirty=%d b_dirty=%d b_io=%d b_more_io=%d\n",
+		       name, ret, !list_empty(&wb->b_dirty), !list_empty(&wb->b_io), !list_empty(&wb->b_more_io));
+		WARN_ON(1);
+	}
+	if (ret && !tot_write_bw) {
+		const char *name = wb->bdi->dev ? dev_name(wb->bdi->dev) : "UNK";
+
+		pr_err("wb_has_dirty_io: ERR %s has_dirty=%d but tot_write_bw=%ld\n",
+		       name, ret, tot_write_bw);
+		WARN_ON(1);
+	}
+	return ret;
 }
 
 static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,8 @@ struct inode {
 #endif
 
 	void			*i_private; /* fs or device private pointer */
+	unsigned		i_dbg_marker;
+	unsigned		i_dbg_marker2;
 };
 
 static inline int inode_unhashed(struct inode *inode)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -382,7 +382,7 @@ static void wb_exit(struct bdi_writeback
  * protected.  cgwb_release_wait is used to wait for the completion of cgwb
  * releases from bdi destruction path.
  */
-static DEFINE_SPINLOCK(cgwb_lock);
+DEFINE_SPINLOCK(cgwb_lock);
 static DECLARE_WAIT_QUEUE_HEAD(cgwb_release_wait);
 
 /**

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Artem Bityutskiy]

On Thu, 2015-09-24 at 16:45 -0400, Tejun Heo wrote:
> Hello, Artem.
> 
> On Thu, Sep 24, 2015 at 11:09:46AM +0300, Artem Bityutskiy wrote:
> > On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> > > So, this should make the regression go away.  It doesn't fix the
> > > underlying bugs but they shouldn't get triggered by people not
> > > experimenting with cgroup.
> > 
> > this hits the nail on the head and makes the problem go away.
> 
> Yeah but there still is an underlying problem here.  I've been going
> through the sync path today but can't trigger or spot anything wrong.
> Can you please apply the patch at the end of this mail, trigger the
> failure and report the kernel log?
> 
> Thanks a lot.

Does not compile with multiple errors like

linux/fs/fs-writeback.c:799:10: error: ‘struct bdi_writeback’ has no member named ‘last_comp_gen’
   bdi->wb.last_comp_gen = bdi->wb.comp_gen;
          ^



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Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Artem Bityutskiy]

On Fri, 2015-09-25 at 09:49 +0300, Artem Bityutskiy wrote:
> On Thu, 2015-09-24 at 16:45 -0400, Tejun Heo wrote:
> > Hello, Artem.
> > 
> > On Thu, Sep 24, 2015 at 11:09:46AM +0300, Artem Bityutskiy wrote:
> > > On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> > > > So, this should make the regression go away.  It doesn't fix
> > > > the
> > > > underlying bugs but they shouldn't get triggered by people not
> > > > experimenting with cgroup.
> > > 
> > > this hits the nail on the head and makes the problem go away.
> > 
> > Yeah but there still is an underlying problem here.  I've been
> > going
> > through the sync path today but can't trigger or spot anything
> > wrong.
> > Can you please apply the patch at the end of this mail, trigger the
> > failure and report the kernel log?
> > 
> > Thanks a lot.
> 
> Does not compile with multiple errors like
> 
> linux/fs/fs-writeback.c:799:10: error: ‘struct bdi_writeback’ has no
> member named ‘last_comp_gen’
>    bdi->wb.last_comp_gen = bdi->wb.comp_gen;

I tried to extend your patch with these fields, but I am not sure I got
it right, so please, send a new patch, I'll run the reboot corruption
test with your patch.

Please, note, because this test is about reboots, I'll probably output
everything to the serial console. Therefore, please, do not print too
much data. Otherwise I'd have to modify my scripts to collect dmesg
before restarting, which is more work.

Artem.

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

Hello, Artem.

On Fri, Sep 25, 2015 at 01:50:22PM +0300, Artem Bityutskiy wrote:
> > Does not compile with multiple errors like
> > 
> > linux/fs/fs-writeback.c:799:10: error: ‘struct bdi_writeback’ has no
> > member named ‘last_comp_gen’
> >    bdi->wb.last_comp_gen = bdi->wb.comp_gen;
> 
> I tried to extend your patch with these fields, but I am not sure I got
> it right, so please, send a new patch, I'll run the reboot corruption
> test with your patch.

Oops, sorry, I'm an idiot.

> Please, note, because this test is about reboots, I'll probably output
> everything to the serial console. Therefore, please, do not print too
> much data. Otherwise I'd have to modify my scripts to collect dmesg
> before restarting, which is more work.

Hmmm... I'm gonna add ratelimit on inode printouts; other than that,
it shouldn't print too much.

Thanks.

---
 fs/fs-writeback.c                |  154 +++++++++++++++++++++++++++++++++++++--
 fs/inode.c                       |    1 
 include/linux/backing-dev-defs.h |    2 
 include/linux/backing-dev.h      |   20 ++++-
 include/linux/fs.h               |    2 
 mm/backing-dev.c                 |    2 
 6 files changed, 173 insertions(+), 8 deletions(-)

--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -101,7 +101,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(wbc_writepa
 
 static bool wb_io_lists_populated(struct bdi_writeback *wb)
 {
-	if (wb_has_dirty_io(wb)) {
+	if (test_bit(WB_has_dirty_io, &wb->state)) {
 		return false;
 	} else {
 		set_bit(WB_has_dirty_io, &wb->state);
@@ -763,6 +763,15 @@ static long wb_split_bdi_pages(struct bd
 		return DIV_ROUND_UP_ULL((u64)nr_pages * this_bw, tot_bw);
 }
 
+extern spinlock_t cgwb_lock;
+
+struct split_work_dbg {
+	DECLARE_BITMAP(all_wbs, 8192);
+	DECLARE_BITMAP(iterated_wbs, 8192);
+	DECLARE_BITMAP(written_wbs, 8192);
+	DECLARE_BITMAP(sync_wbs, 8192);
+};
+
 /**
  * bdi_split_work_to_wbs - split a wb_writeback_work to all wb's of a bdi
  * @bdi: target backing_dev_info
@@ -776,11 +785,25 @@ static long wb_split_bdi_pages(struct bd
  */
 static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
 				  struct wb_writeback_work *base_work,
-				  bool skip_if_busy)
+				  bool skip_if_busy, struct split_work_dbg *dbg)
 {
 	int next_memcg_id = 0;
 	struct bdi_writeback *wb;
 	struct wb_iter iter;
+	struct radix_tree_iter riter;
+	void **slot;
+
+	if (dbg) {
+		spin_lock_irq(&cgwb_lock);
+		set_bit(bdi->wb.memcg_css->id, dbg->all_wbs);
+		bdi->wb.last_comp_gen = bdi->wb.comp_gen;
+		radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &riter, 0) {
+			wb = *slot;
+			set_bit(wb->memcg_css->id, dbg->all_wbs);
+			wb->last_comp_gen = wb->comp_gen;
+		}
+		spin_unlock_irq(&cgwb_lock);
+	}
 
 	might_sleep();
 restart:
@@ -791,6 +814,9 @@ restart:
 		struct wb_writeback_work *work;
 		long nr_pages;
 
+		if (dbg)
+			set_bit(wb->memcg_css->id, dbg->iterated_wbs);
+
 		/* SYNC_ALL writes out I_DIRTY_TIME too */
 		if (!wb_has_dirty_io(wb) &&
 		    (base_work->sync_mode == WB_SYNC_NONE ||
@@ -799,6 +825,9 @@ restart:
 		if (skip_if_busy && writeback_in_progress(wb))
 			continue;
 
+		if (dbg)
+			set_bit(wb->memcg_css->id, dbg->written_wbs);
+
 		nr_pages = wb_split_bdi_pages(wb, base_work->nr_pages);
 
 		work = kmalloc(sizeof(*work), GFP_ATOMIC);
@@ -817,6 +846,8 @@ restart:
 		work->auto_free = 0;
 		work->done = &fallback_work_done;
 
+		if (dbg)
+			set_bit(wb->memcg_css->id, dbg->sync_wbs);
 		wb_queue_work(wb, work);
 
 		next_memcg_id = wb->memcg_css->id + 1;
@@ -1425,6 +1456,9 @@ static long writeback_sb_inodes(struct s
 			break;
 		}
 
+		inode->i_dbg_marker = 0;
+		inode->i_dbg_marker2 = 0;
+
 		/*
 		 * Don't bother with new inodes or inodes being freed, first
 		 * kind does not need periodic writeout yet, and for the latter
@@ -1515,6 +1549,7 @@ static long writeback_sb_inodes(struct s
 				break;
 		}
 	}
+
 	return wrote;
 }
 
@@ -1574,6 +1609,28 @@ static long writeback_inodes_wb(struct b
 	return nr_pages - work.nr_pages;
 }
 
+static int inode_which_wb_io_list(struct inode *inode, struct backing_dev_info *bdi)
+{
+	struct bdi_writeback *wb = inode->i_wb ?: &bdi->wb;
+	struct inode *pos;
+
+	if (list_empty(&inode->i_io_list))
+		return 0;
+	list_for_each_entry(pos, &wb->b_dirty, i_io_list)
+		if (pos == inode)
+			return 1;
+	list_for_each_entry(pos, &wb->b_io, i_io_list)
+		if (pos == inode)
+			return 2;
+	list_for_each_entry(pos, &wb->b_more_io, i_io_list)
+		if (pos == inode)
+			return 3;
+	list_for_each_entry(pos, &wb->b_dirty_time, i_io_list)
+		if (pos == inode)
+			return 4;
+	return 5;
+}
+
 /*
  * Explicit flushing or periodic writeback of "old" data.
  *
@@ -1604,6 +1661,16 @@ static long wb_writeback(struct bdi_writ
 
 	blk_start_plug(&plug);
 	spin_lock(&wb->list_lock);
+
+	list_for_each_entry(inode, &wb->b_dirty, i_io_list)
+		inode->i_dbg_marker2 = 1;
+	list_for_each_entry(inode, &wb->b_io, i_io_list)
+		inode->i_dbg_marker2 = 2;
+	list_for_each_entry(inode, &wb->b_more_io, i_io_list)
+		inode->i_dbg_marker2 = 3;
+	list_for_each_entry(inode, &wb->b_dirty_time, i_io_list)
+		inode->i_dbg_marker2 = 4;
+
 	for (;;) {
 		/*
 		 * Stop writeback when nr_pages has been consumed
@@ -1681,6 +1748,24 @@ static long wb_writeback(struct bdi_writ
 			spin_lock(&wb->list_lock);
 		}
 	}
+
+	if (work->sync_mode == WB_SYNC_ALL) {
+		list_for_each_entry(inode, &wb->b_dirty, i_io_list)
+			if (inode->i_dbg_marker2)
+				printk("XXX wb_writeback: inode %lu marker2=%d on b_dirty\n",
+				       inode->i_ino, inode->i_dbg_marker2);
+		list_for_each_entry(inode, &wb->b_io, i_io_list)
+			printk("XXX wb_writeback: inode %lu marker2=%d on b_io\n",
+			       inode->i_ino, inode->i_dbg_marker2);
+		list_for_each_entry(inode, &wb->b_more_io, i_io_list)
+			printk("XXX wb_writeback: inode %lu marker2=%d on b_more_io\n",
+			       inode->i_ino, inode->i_dbg_marker2);
+		list_for_each_entry(inode, &wb->b_dirty_time, i_io_list)
+			if (inode->i_dbg_marker2)
+				printk("XXX wb_writeback: inode %lu marker2=%d on b_dirty_time\n",
+				       inode->i_ino, inode->i_dbg_marker2);
+	}
+
 	spin_unlock(&wb->list_lock);
 	blk_finish_plug(&plug);
 
@@ -1785,8 +1870,11 @@ static long wb_do_writeback(struct bdi_w
 
 		if (work->auto_free)
 			kfree(work);
-		if (done && atomic_dec_and_test(&done->cnt))
-			wake_up_all(&wb->bdi->wb_waitq);
+		if (done) {
+			wb->comp_gen++;
+			if (atomic_dec_and_test(&done->cnt))
+				wake_up_all(&wb->bdi->wb_waitq);
+		}
 	}
 
 	/*
@@ -1976,6 +2064,9 @@ void __mark_inode_dirty(struct inode *in
 
 	trace_writeback_mark_inode_dirty(inode, flags);
 
+	WARN_ON_ONCE(!(sb->s_flags & MS_LAZYTIME) &&
+		     !list_empty(&inode_to_bdi(inode)->wb.b_dirty_time));
+
 	/*
 	 * Don't do this for I_DIRTY_PAGES - that doesn't actually
 	 * dirty the inode itself
@@ -2165,7 +2256,7 @@ static void __writeback_inodes_sb_nr(str
 		return;
 	WARN_ON(!rwsem_is_locked(&sb->s_umount));
 
-	bdi_split_work_to_wbs(sb->s_bdi, &work, skip_if_busy);
+	bdi_split_work_to_wbs(sb->s_bdi, &work, skip_if_busy, NULL);
 	wb_wait_for_completion(bdi, &done);
 }
 
@@ -2257,6 +2348,10 @@ void sync_inodes_sb(struct super_block *
 		.for_sync	= 1,
 	};
 	struct backing_dev_info *bdi = sb->s_bdi;
+	static DEFINE_MUTEX(dbg_mutex);
+	static struct split_work_dbg dbg;
+	static DECLARE_BITMAP(tmp_bitmap, 8192);
+	struct inode *inode;
 
 	/*
 	 * Can't skip on !bdi_has_dirty() because we should wait for !dirty
@@ -2267,9 +2362,56 @@ void sync_inodes_sb(struct super_block *
 		return;
 	WARN_ON(!rwsem_is_locked(&sb->s_umount));
 
-	bdi_split_work_to_wbs(bdi, &work, false);
+	mutex_lock(&dbg_mutex);
+
+	printk("XXX SYNCING %d:%d\n", MAJOR(sb->s_dev), MINOR(sb->s_dev));
+
+	bitmap_zero(dbg.all_wbs, 8192);
+	bitmap_zero(dbg.iterated_wbs, 8192);
+	bitmap_zero(dbg.written_wbs, 8192);
+	bitmap_zero(dbg.sync_wbs, 8192);
+
+	spin_lock(&sb->s_inode_list_lock);
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+		spin_lock(&inode->i_lock);
+		inode->i_dbg_marker = inode_which_wb_io_list(inode, bdi);
+		spin_unlock(&inode->i_lock);
+	}
+	spin_unlock(&sb->s_inode_list_lock);
+
+	bdi_split_work_to_wbs(bdi, &work, false, &dbg);
 	wb_wait_for_completion(bdi, &done);
 
+	spin_lock(&sb->s_inode_list_lock);
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
+		struct bdi_writeback *wb = inode->i_wb ?: &bdi->wb;
+
+		if (!inode->i_dbg_marker)
+			continue;
+
+		spin_lock_irq(&wb->list_lock);
+		if (inode->i_state & I_DIRTY_ALL)
+			printk_ratelimited("XXX sync_inodes_sb(%d:%d): dirty inode %lu skipped, wb=%d comp_gen=%d->%d which=%d->%d i_state=0x%lx\n",
+			       MAJOR(sb->s_dev), MINOR(sb->s_dev), inode->i_ino,
+			       wb->memcg_css->id, wb->last_comp_gen, wb->comp_gen,
+			       inode->i_dbg_marker, inode_which_wb_io_list(inode, bdi),
+			       inode->i_state);
+		spin_unlock_irq(&wb->list_lock);
+	}
+	spin_unlock(&sb->s_inode_list_lock);
+
+	bitmap_andnot(tmp_bitmap, dbg.all_wbs, dbg.iterated_wbs, 8192);
+	if (!bitmap_empty(tmp_bitmap, 8192))
+		printk("XXX sync_inodes_sb(%d:%d): iteration skipped %8192pbl\n",
+		       MAJOR(sb->s_dev), MINOR(sb->s_dev), tmp_bitmap);
+
+	printk("XXX all_wbs      = %8192pbl\n", dbg.all_wbs);
+	printk("XXX iterated_wbs = %8192pbl\n", dbg.iterated_wbs);
+	printk("XXX written_wbs  = %8192pbl\n", dbg.written_wbs);
+	printk("XXX sync_wbs     = %8192pbl\n", dbg.sync_wbs);
+
+	mutex_unlock(&dbg_mutex);
+
 	wait_sb_inodes(sb);
 }
 EXPORT_SYMBOL(sync_inodes_sb);
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -183,6 +183,7 @@ int inode_init_always(struct super_block
 #endif
 	inode->i_flctx = NULL;
 	this_cpu_inc(nr_inodes);
+	inode->i_dbg_marker = 0;
 
 	return 0;
 out:
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -129,6 +129,8 @@ struct bdi_writeback {
 		struct rcu_head rcu;
 	};
 #endif
+	int comp_gen;
+	int last_comp_gen;
 };
 
 struct backing_dev_info {
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -38,7 +38,25 @@ extern struct workqueue_struct *bdi_wq;
 
 static inline bool wb_has_dirty_io(struct bdi_writeback *wb)
 {
-	return test_bit(WB_has_dirty_io, &wb->state);
+	bool ret = test_bit(WB_has_dirty_io, &wb->state);
+	long tot_write_bw = atomic_long_read(&wb->bdi->tot_write_bandwidth);
+
+	if (!ret && (!list_empty(&wb->b_dirty) || !list_empty(&wb->b_io) ||
+		     !list_empty(&wb->b_more_io))) {
+		const char *name = wb->bdi->dev ? dev_name(wb->bdi->dev) : "UNK";
+
+		pr_err("wb_has_dirty_io: ERR %s has_dirty=%d b_dirty=%d b_io=%d b_more_io=%d\n",
+		       name, ret, !list_empty(&wb->b_dirty), !list_empty(&wb->b_io), !list_empty(&wb->b_more_io));
+		WARN_ON(1);
+	}
+	if (ret && !tot_write_bw) {
+		const char *name = wb->bdi->dev ? dev_name(wb->bdi->dev) : "UNK";
+
+		pr_err("wb_has_dirty_io: ERR %s has_dirty=%d but tot_write_bw=%ld\n",
+		       name, ret, tot_write_bw);
+		WARN_ON(1);
+	}
+	return ret;
 }
 
 static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -677,6 +677,8 @@ struct inode {
 #endif
 
 	void			*i_private; /* fs or device private pointer */
+	unsigned		i_dbg_marker;
+	unsigned		i_dbg_marker2;
 };
 
 static inline int inode_unhashed(struct inode *inode)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -382,7 +382,7 @@ static void wb_exit(struct bdi_writeback
  * protected.  cgwb_release_wait is used to wait for the completion of cgwb
  * releases from bdi destruction path.
  */
-static DEFINE_SPINLOCK(cgwb_lock);
+DEFINE_SPINLOCK(cgwb_lock);
 static DECLARE_WAIT_QUEUE_HEAD(cgwb_release_wait);
 
 /**

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Artem Bityutskiy]

On Fri, 2015-09-25 at 11:49 -0400, Tejun Heo wrote:
> Hello, Artem.

I've applied this patch on top of

ced255c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

I've added 'ignore_loglevel' to the kernel boot parameters. I have the
serial console configured and I collect the serial output.

I've reproduced the issue on a machine with host name 'ivbep0'. The
serial log is at the end of this e-mail.

To recap, the test I did is.

1. The machine runs the ced255c kernel + your patch.
2. We are re-installing the same kernel there by doing this:
2.1 Remove the modules: /usr/lib/modules/v4.3-rc2+
2.2 Copy the modules to /usr/lib/modules/v4.3-rc2+
3. We run 'sync'
4. We run 'reboot'

Expected outcome: the machine reboots into the same kernel, modules can
be loaded and they are not corrupted.

Real outcome: the kernel boots up, but modules cannot be loaded,
because they are corrupted, for example:

[root@ivbep0 ~]# modprobe xfs
modprobe: ERROR: magic check fail: 0 instead of b007f457
[root@ivbep0 ~]# hexdump /usr/lib/modules/4.3.0-rc2+/kernel/fs/xfs/xfs.ko  
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
17adc90 0000 0000 0000 0000 0000 0000 0000      
17adc9e
[root@ivbep0 ~]# file /usr/lib/modules/4.3.0-rc2+/kernel/fs/xfs/xfs.ko         
/usr/lib/modules/4.3.0-rc2+/kernel/fs/xfs/xfs.ko: data

To make it easier for you, I've edited the log and added a couple of
comments there describing the stage we are at.

HTH,
Artem.


#
# Artem: The below is printed when we run 'sync'
#
[   94.900810] XXX SYNCING 8:1
[   95.075622] XXX sync_inodes_sb(8:1): dirty inode 13107315 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.087258] XXX sync_inodes_sb(8:1): dirty inode 13107314 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.098881] XXX sync_inodes_sb(8:1): dirty inode 13107313 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.110487] XXX sync_inodes_sb(8:1): dirty inode 13107312 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.122085] XXX sync_inodes_sb(8:1): dirty inode 13107311 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.133677] XXX sync_inodes_sb(8:1): dirty inode 13107310 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.145259] XXX sync_inodes_sb(8:1): dirty inode 13107309 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.156854] XXX sync_inodes_sb(8:1): dirty inode 13107308 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.168447] XXX sync_inodes_sb(8:1): dirty inode 13107307 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.180034] XXX sync_inodes_sb(8:1): dirty inode 13107306 skipped, wb=15 comp_gen=0->0 which=1->1 i_state=0x7
[   95.191703] XXX all_wbs      = 1
[   95.195596] XXX iterated_wbs = 1
[   95.199488] XXX written_wbs  = 1
[   95.203382] XXX sync_wbs     = 
[   95.568881] echo (1452): drop_caches: 3
[   95.982140] XXX SYNCING 8:1
[   95.999746] XXX all_wbs      = 1
[   96.003668] XXX iterated_wbs = 1
[   96.007569] XXX written_wbs  = 1
[   96.011472] XXX sync_wbs     = 
[   96.394702] XXX SYNCING 8:1
[   96.404041] ixgbe 0000:81:00.0: removed PHC on enp129s0f0
[   96.803148] systemd[1]: Received SIGRTMIN+20 from PID 1499 (plymouthd).
[^[[32m  OK  ^[[0m] Stopped Network Manager.
[   96.816673] XXX all_wbs      = 1
[   96.820401] XXX iterated_wbs = 1
[   96.824099] XXX written_wbs  = 1
[   96.827790] XXX sync_wbs     = 
#
# Artem: The below is printed when we run 'restart'
#
[^[[32m  OK  ^[[0m] Started Show Plymouth Power Off Screen.
[^[[32m  OK  ^[[0m] Stopped User Manager for UID 0.
         Stopping Permit User Sessions...
[^[[32m  OK  ^[[0m] Removed slice user-0.slice.
[^[[32m  OK  ^[[0m] Stopped Permit User Sessions.
[^[[32m  OK  ^[[0m] Stopped target Remote File Systems.
[^[[32m  OK  ^[[0m] Stopped target Basic System.
[^[[32m  OK  ^[[0m] Stopped target Paths.
[^[[32m  OK  ^[[0m] Stopped target Sockets.
[^[[32m  OK  ^[[0m] Closed D-Bus [   97.249846] audit_printk_skb: 18 callbacks suppressed
System Message B[   97.256420] audit: type=1305 audit(1443252516.709:330): audit_pid=0 old=1012 auid=4294967295 ses=4294967295 res=1
us Socket.
[^[[[   97.269838] audit: type=1131 audit(1443252516.729:331): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=auditd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
32m  OK  ^[[0m] S[   97.291815] audit: type=1131 audit(1443252516.751:332): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-setup comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
topped target System Initializat[   97.315950] audit: type=1131 audit(1443252516.776:333): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=fedora-import-state comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
ion.
[^[[32m  OK  ^[[0m] Stopped target Encrypte[   97.343202] audit: type=1131 audit(1443252516.803:334): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
d Volumes.
[^[[[   97.365840] audit: type=1131 audit(1443252516.825:335): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=fedora-readonly comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
32m  OK  ^[[0m] Stopped target Swap.
         Stopping Load/Save Random Seed...
         Stopping Security Auditing Service...
[^[[32m  OK  ^[[0m] Stopped Apply Kernel Variables.
        [   97.405563] audit: type=1131 audit(1443252516.865:336): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-remount-fs comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
 Stopping Apply Kernel Variables[   97.429778] audit: type=1131 audit(1443252516.889:337): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-setup-dev comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
...
[^[[32m  OK  ^[[0m] Stopped Setup Virtual Console.
         Stopping Setup Virtual Console...
[^[[32m  OK  ^[[0m] Stopped target Slices.
[^[[32m  OK  ^[[0m] Removed slice User and Session Slice.
[^[[32m  OK  ^[[0m] Stopped Security Auditing Service.
[^[[32m  OK  ^[[0m] Stopped Create Volatile Files and Directories.
         Stopping Create Volatile Files and Directories...
[^[[32m  OK  ^[[0m] Stopped Import network configuration from initramfs.
         Stopping Import network configuration from initramfs...
[^[[32m  OK  ^[[0m] Stopped target Local File Systems.
         Unmounting Temporary Directory...
[   97.514487] systemd-shutdown[1]: Sending SIGTERM to remaining processes...

         Unmounting /run/user/0...
         Unmounting Configuration File System...
[^[[32m  OK  ^[[0m] Stopped Load/Save Random Seed.
[^[[32m  OK  ^[[0m] Stopped Configure read-only root support.
         Stopping Configure read-only root support...
[^[[32m  OK  ^[[0m] Unmounted /run/user/0.
[^[[32m  OK  ^[[0m] Unmounted Tempor[   97.556195] systemd-journald[952]: Received SIGTERM from PID 1 (systemd-shutdow).
ary Directory.
[^[[32m  OK  ^[[0m] Unmounted Configuration File System.
[^[[32m  OK  ^[[0m] Reached target Unmount All Filesystems.
[^[[32m  OK  ^[[0m] Stopped target Local File Systems (Pre).
[^[[32m  OK  ^[[0m] Stopped Remount Root and Kernel File Systems.
         Stopping Remount Root and Kernel File Systems...
[^[[32m  OK  ^[[0m] Stopped Create Static Device Nodes in /dev.
         Stopping Create Static Device Nodes in /dev...
[^[[32m  OK  ^[[0m] Reached target Shutdown.
[   97.867762] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[   97.896993] systemd-shutdown[1]: Unmounting file systems.
[   97.903912] XXX SYNCING 8:1
[   97.909272] XXX wb_writeback: inode 0 marker2=1 on b_dirty
[   97.915762] XXX all_wbs      = 1,17
[   97.919950] XXX iterated_wbs = 1,17
[   97.924131] XXX written_wbs  = 1
[   97.928021] XXX sync_wbs     = 
[   98.069893] EXT4-fs (sda1): re-mounted. Opts: (null)
[   98.076437] EXT4-fs (sda1): re-mounted. Opts: (null)
[   98.082281] systemd-shutdown[1]: All filesystems unmounted.
[   98.088794] systemd-shutdown[1]: Deactivating swaps.
[   98.094660] systemd-shutdown[1]: All swaps deactivated.
[   98.100780] systemd-shutdown[1]: Detaching loop devices.
[   98.135582] systemd-shutdown[1]: All loop devices detached.
[   98.142090] systemd-shutdown[1]: Detaching DM devices.
[   98.148154] systemd-shutdown[1]: All DM devices detached.
[   98.178359] systemd-shutdown[1]: Powering off.
[   98.183644] kvm: exiting hardware virtualization
[   98.773702] pcieport 0000:00:1c.0: System wakeup enabled by ACPI
[   98.909853] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[   98.915989] sd 0:0:0:0: [sda] Stopping disk
[   99.350194] ACPI: Preparing to enter system sleep state S5
[   99.358139] reboot: Power down
[   99.362200] acpi_power_off called

#
# Artem: the machine restarted, and now booting the same kernel.
# I do not see your messages there, but included for reference.
#
[    0.000000] microcode: CPU0 microcode updated early to revision 0x428, date = 2014-05-29
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 4.3.0-rc2+ (abityuts@powerlab) (gcc version 5.1.1 20150618 (Red Hat 5.1.1-4) (GCC) ) #1 SMP Sat Sep 26 10:11:32 EEST 2015
[    0.000000] Command line: initrd=/suts/ivbep0/custom-kernel/initramfs.img root=/dev/sda1 ro console=tty0 console=ttyS0,115200 LANG=en_US.UTF-8 nomodeset ignore_loglevel BOOT_IMAGE=/suts/ivbep0/custom-kernel/kernel 
[    0.000000] x86/fpu: xstate_offset[2]: 0240, xstate_sizes[2]: 0100
[    0.000000] x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers'
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 0x340 bytes, using 'standard' format.
[    0.000000] x86/fpu: Using 'eager' FPU context switches.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009bbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009bc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000ba762fff] usable
[    0.000000] BIOS-e820: [mem 0x00000000ba763000-0x00000000bac7ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000bac80000-0x00000000bb019fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000bb01a000-0x00000000bd956fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000bd957000-0x00000000bdb5bfff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000bdb5c000-0x00000000bdde6fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000bdde7000-0x00000000bde2bfff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000bde2c000-0x00000000bdefffff] ACPI data
[    0.000000] BIOS-e820: [mem 0x00000000bdf00000-0x00000000bdf00fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000bdf01000-0x00000000bdf1efff] ACPI data
[    0.000000] BIOS-e820: [mem 0x00000000bdf1f000-0x00000000bdffffff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x00000000be000000-0x00000000cfffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed19000-0x00000000fed19fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000ffc00000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000103fffffff] usable
[    0.000000] debug: ignoring loglevel setting.
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.6 present.
[    0.000000] DMI: Intel Corporation S2600CP/S2600CP, BIOS RMLSDP.86I.00.29.D696.1311111329 11/11/2013
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] e820: last_pfn = 0x1040000 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: uncachable
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-CBFFF write-through
[    0.000000]   CC000-E7FFF uncachable
[    0.000000]   E8000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 000000000000 mask 3FFF80000000 write-back
[    0.000000]   1 base 000080000000 mask 3FFFC0000000 write-back
[    0.000000]   2 base 000100000000 mask 3FFF00000000 write-back
[    0.000000]   3 base 000200000000 mask 3FFE00000000 write-back
[    0.000000]   4 base 000400000000 mask 3FFC00000000 write-back
[    0.000000]   5 base 000800000000 mask 3FF800000000 write-back
[    0.000000]   6 base 001000000000 mask 3FFFC0000000 write-back
[    0.000000]   7 base 0000FFC00000 mask 3FFFFFC00000 write-protect
[    0.000000]   8 disabled
[    0.000000]   9 disabled
[    0.000000] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WC  UC- WT  
[    0.000000] e820: last_pfn = 0xba763 max_arch_pfn = 0x400000000
[    0.000000] found SMP MP-table at [mem 0x000fcb30-0x000fcb3f] mapped at [ffff8800000fcb30]
[    0.000000] Base memory trampoline at [ffff880000095000] 95000 size 24576
[    0.000000] Using GB pages for direct mapping
[    0.000000] init_memory_mapping: [mem 0x00000000-0x000fffff]
[    0.000000]  [mem 0x00000000-0x000fffff] page 4k
[    0.000000] BRK [0x02004000, 0x02004fff] PGTABLE
[    0.000000] BRK [0x02005000, 0x02005fff] PGTABLE
[    0.000000] BRK [0x02006000, 0x02006fff] PGTABLE
[    0.000000] init_memory_mapping: [mem 0x103fe00000-0x103fffffff]
[    0.000000]  [mem 0x103fe00000-0x103fffffff] page 1G
[    0.000000] init_memory_mapping: [mem 0x1020000000-0x103fdfffff]
[    0.000000]  [mem 0x1020000000-0x103fdfffff] page 1G
[    0.000000] init_memory_mapping: [mem 0x00100000-0xba762fff]
[    0.000000]  [mem 0x00100000-0x001fffff] page 4k
[    0.000000]  [mem 0x00200000-0x3fffffff] page 2M
[    0.000000]  [mem 0x40000000-0x7fffffff] page 1G
[    0.000000]  [mem 0x80000000-0xba5fffff] page 2M
[    0.000000]  [mem 0xba600000-0xba762fff] page 4k
[    0.000000] init_memory_mapping: [mem 0x100000000-0x101fffffff]
[    0.000000]  [mem 0x100000000-0x101fffffff] page 1G
[    0.000000] RAMDISK: [mem 0x7d204000-0x7fffefff]
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F0410 000024 (v02 INTEL )
[    0.000000] ACPI: XSDT 0x00000000BDF1CD98 00008C (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: FACP 0x00000000BDF1CA98 0000F4 (v04 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI BIOS Warning (bug): Invalid length for FADT/Pm1aControlBlock: 32, using default 16 (20150818/tbfadt-704)
[    0.000000] ACPI: DSDT 0x00000000BDF01018 019B5A (v02 INTEL  ROMLEY   00000029 INTL 20100331)
[    0.000000] ACPI: FACS 0x00000000BDF1CF40 000040
[    0.000000] ACPI: FACS 0x00000000BDF1CF40 000040
[    0.000000] ACPI: APIC 0x00000000BDF1B018 000BAA (v03 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: SPMI 0x00000000BDF1EF18 000041 (v05 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: MCFG 0x00000000BDF1EE98 00003C (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: SRAT 0x00000000BDF1BC18 0003A8 (v03 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: SLIT 0x00000000BDF1ED98 000030 (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: MSCT 0x00000000BDF1ED18 00004E (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: HPET 0x00000000BDF1EE18 000038 (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: SSDT 0x00000000BDF1EC98 00002B (v02 INTEL  PtidDevc 00001000 INTL 20100331)
[    0.000000] ACPI: BOOT 0x00000000BDF1EC18 000028 (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: SSDT 0x00000000BDE2C018 0D3050 (v02 INTEL  CpuPm    00004000 INTL 20100331)
[    0.000000] ACPI: DMAR 0x00000000BDF1C918 000120 (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: BDAT 0x00000000BDF1EB98 000030 (v01 INTEL  ROMLEY   06222004 INTL 20090903)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] SRAT: PXM 0 -> APIC 0x00 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x01 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x02 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x03 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x04 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x05 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x06 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x07 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x08 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x09 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x0a -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x0b -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x10 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x11 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x12 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x13 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x14 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x15 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x16 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x17 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x18 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x19 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x1a -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x1b -> Node 0
[    0.000000] SRAT: PXM 1 -> APIC 0x20 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x21 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x22 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x23 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x24 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x25 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x26 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x27 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x28 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x29 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x2a -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x2b -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x30 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x31 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x32 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x33 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x34 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x35 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x36 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x37 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x38 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x39 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x3a -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x3b -> Node 1
[    0.000000] SRAT: Node 0 PXM 0 [mem 0x00000000-0xbfffffff]
[    0.000000] SRAT: Node 0 PXM 0 [mem 0x100000000-0x83fffffff]
[    0.000000] SRAT: Node 1 PXM 1 [mem 0x840000000-0x103fffffff]
[    0.000000] NUMA: Initialized distance table, cnt=2
[    0.000000] NUMA: Node 0 [mem 0x00000000-0xbfffffff] + [mem 0x100000000-0x83fffffff] -> [mem 0x00000000-0x83fffffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x83ffec000-0x83fffffff]
[    0.000000] NODE_DATA(1) allocated [mem 0x103ffe9000-0x103fffcfff]
[    0.000000]  [ffffea0000000000-ffffea0020ffffff] PMD -> [ffff88081fe00000-ffff88083fdfffff] on node 0
[    0.000000]  [ffffea0021000000-ffffea0040ffffff] PMD -> [ffff88101f600000-ffff88103f5fffff] on node 1
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
[    0.000000]   Normal   [mem 0x0000000100000000-0x000000103fffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009afff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x00000000ba762fff]
[    0.000000]   node   0: [mem 0x0000000100000000-0x000000083fffffff]
[    0.000000]   node   1: [mem 0x0000000840000000-0x000000103fffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000083fffffff]
[    0.000000] On node 0 totalpages: 8365821
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3994 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 11870 pages used for memmap
[    0.000000]   DMA32 zone: 759651 pages, LIFO batch:31
[    0.000000]   Normal zone: 118784 pages used for memmap
[    0.000000]   Normal zone: 7602176 pages, LIFO batch:31
[    0.000000] Initmem setup node 1 [mem 0x0000000840000000-0x000000103fffffff]
[    0.000000] On node 1 totalpages: 8388608
[    0.000000]   Normal zone: 131072 pages used for memmap
[    0.000000]   Normal zone: 8388608 pages, LIFO batch:31
[    0.000000] ACPI: PM-Timer IO Port: 0x408
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] IOAPIC[0]: apic_id 0, version 32, address 0xfec00000, GSI 0-23
[    0.000000] IOAPIC[1]: apic_id 1, version 32, address 0xfec3f000, GSI 24-47
[    0.000000] IOAPIC[2]: apic_id 2, version 32, address 0xfec7f000, GSI 48-71
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: IRQ0 used by override.
[    0.000000] ACPI: IRQ9 used by override.
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
[    0.000000] smpboot: Allowing 240 CPUs, 192 hotplug CPUs
[    0.000000] PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
[    0.000000] PM: Registered nosave memory: [mem 0x0009b000-0x0009bfff]
[    0.000000] PM: Registered nosave memory: [mem 0x0009c000-0x0009ffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000dffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000e0000-0x000fffff]
[    0.000000] PM: Registered nosave memory: [mem 0xba763000-0xbac7ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xbac80000-0xbb019fff]
[    0.000000] PM: Registered nosave memory: [mem 0xbb01a000-0xbd956fff]
[    0.000000] PM: Registered nosave memory: [mem 0xbd957000-0xbdb5bfff]
[    0.000000] PM: Registered nosave memory: [mem 0xbdb5c000-0xbdde6fff]
[    0.000000] PM: Registered nosave memory: [mem 0xbdde7000-0xbde2bfff]
[    0.000000] PM: Registered nosave memory: [mem 0xbde2c000-0xbdefffff]
[    0.000000] PM: Registered nosave memory: [mem 0xbdf00000-0xbdf00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xbdf01000-0xbdf1efff]
[    0.000000] PM: Registered nosave memory: [mem 0xbdf1f000-0xbdffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xbe000000-0xcfffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xd0000000-0xfebfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfec00000-0xfec00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfec01000-0xfed18fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed19000-0xfed19fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed1a000-0xfed1bfff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed1c000-0xfed1ffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfed20000-0xfedfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfee00000-0xfee00fff]
[    0.000000] PM: Registered nosave memory: [mem 0xfee01000-0xffbfffff]
[    0.000000] PM: Registered nosave memory: [mem 0xffc00000-0xffffffff]
[    0.000000] e820: [mem 0xd0000000-0xfebfffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on bare hardware
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:240 nr_node_ids:2
[    0.000000] PERCPU: Embedded 32 pages/cpu @ffff88081ee00000 s93784 r8192 d29096 u131072
[    0.000000] pcpu-alloc: s93784 r8192 d29096 u131072 alloc=1*2097152
[    0.000000] pcpu-alloc: [0] 000 001 002 003 004 005 006 007 008 009 010 011 024 025 026 027 
[    0.000000] pcpu-alloc: [0] 028 029 030 031 032 033 034 035 048 050 052 054 056 058 060 062 
[    0.000000] pcpu-alloc: [0] 064 066 068 070 072 074 076 078 080 082 084 086 088 090 092 094 
[    0.000000] pcpu-alloc: [0] 096 098 100 102 104 106 108 110 112 114 116 118 120 122 124 126 
[    0.000000] pcpu-alloc: [0] 128 130 132 134 136 138 140 142 144 146 148 150 152 154 156 158 
[    0.000000] pcpu-alloc: [0] 160 162 164 166 168 170 172 174 176 178 180 182 184 186 188 190 
[    0.000000] pcpu-alloc: [0] 192 194 196 198 200 202 204 206 208 210 212 214 216 218 220 222 
[    0.000000] pcpu-alloc: [0] 224 226 228 230 232 234 236 238 --- --- --- --- --- --- --- --- 
[    0.000000] pcpu-alloc: [1] 012 013 014 015 016 017 018 019 020 021 022 023 036 037 038 039 
[    0.000000] pcpu-alloc: [1] 040 041 042 043 044 045 046 047 049 051 053 055 057 059 061 063 
[    0.000000] pcpu-alloc: [1] 065 067 069 071 073 075 077 079 081 083 085 087 089 091 093 095 
[    0.000000] pcpu-alloc: [1] 097 099 101 103 105 107 109 111 113 115 117 119 121 123 125 127 
[    0.000000] pcpu-alloc: [1] 129 131 133 135 137 139 141 143 145 147 149 151 153 155 157 159 
[    0.000000] pcpu-alloc: [1] 161 163 165 167 169 171 173 175 177 179 181 183 185 187 189 191 
[    0.000000] pcpu-alloc: [1] 193 195 197 199 201 203 205 207 209 211 213 215 217 219 221 223 
[    0.000000] pcpu-alloc: [1] 225 227 229 231 233 235 237 239 --- --- --- --- --- --- --- --- 
[    0.000000] Built 2 zonelists in Node order, mobility grouping on.  Total pages: 16492618
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: initrd=/suts/ivbep0/custom-kernel/initramfs.img root=/dev/sda1 ro console=tty0 console=ttyS0,115200 LANG=en_US.UTF-8 nomodeset ignore_loglevel BOOT_IMAGE=/suts/ivbep0/custom-kernel/kernel 
[    0.000000] log_buf_len individual max cpu contribution: 4096 bytes
[    0.000000] log_buf_len total cpu_extra contributions: 978944 bytes
[    0.000000] log_buf_len min size: 262144 bytes
[    0.000000] log_buf_len: 2097152 bytes
[    0.000000] early log buf free: 244568(93%)
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Memory: 65806184K/67017716K available (6874K kernel code, 1170K rwdata, 3080K rodata, 1408K init, 1492K bss, 1211532K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=240, Nodes=2
[    0.000000] Hierarchical RCU implementation.
[    0.000000] 	Build-time adjustment of leaf fanout to 64.
[    0.000000] 	RCU restricting CPUs from NR_CPUS=512 to nr_cpu_ids=240.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=240
[    0.000000] NR_IRQS:33024 nr_irqs:3160 16
[    0.000000] 	Offload RCU callbacks from all CPUs
[    0.000000] 	Offload RCU callbacks from CPUs: 0-239.
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [ttyS0] enabled
[    0.000000] mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl
[    0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 133484882848 ns
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 2693.671 MHz processor
[    0.000119] Calibrating delay loop (skipped), value calculated using timer frequency.. 5387.34 BogoMIPS (lpj=2693671)
[    0.012547] pid_max: default: 245760 minimum: 1920
[    0.018246] ACPI: Core revision 20150818
[    0.079790] ACPI: 3 ACPI AML tables successfully acquired and loaded
[    0.087782] Security Framework initialized
[    0.092636] SELinux:  Initializing.
[    0.096817] SELinux:  Starting in permissive mode
[    0.106345] Dentry cache hash table entries: 8388608 (order: 14, 67108864 bytes)
[    0.131064] Inode-cache hash table entries: 4194304 (order: 13, 33554432 bytes)
[    0.146666] Mount-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.154895] Mountpoint-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.164798] Initializing cgroup subsys io
[    0.169562] Initializing cgroup subsys memory
[    0.174774] Initializing cgroup subsys devices
[    0.180018] Initializing cgroup subsys freezer
[    0.185261] Initializing cgroup subsys net_cls
[    0.190509] Initializing cgroup subsys perf_event
[    0.196068] Initializing cgroup subsys net_prio
[    0.201408] Initializing cgroup subsys hugetlb
[    0.206804] CPU: Physical Processor ID: 0
[    0.211560] CPU: Processor Core ID: 0
[    0.216730] mce: CPU supports 29 MCE banks
[    0.221625] CPU0: Thermal monitoring enabled (TM1)
[    0.227288] process: using mwait in idle threads
[    0.232727] Last level iTLB entries: 4KB 512, 2MB 8, 4MB 8
[    0.239140] Last level dTLB entries: 4KB 512, 2MB 0, 4MB 0, 1GB 4
[    0.246718] Freeing SMP alternatives memory: 28K (ffffffff81e86000 - ffffffff81e8d000)
[    0.283410] ftrace: allocating 25890 entries in 102 pages
[    0.301868] DMAR: Host address width 46
[    0.306436] DMAR: DRHD base: 0x000000fbffe000 flags: 0x0
[    0.312655] DMAR: dmar0: reg_base_addr fbffe000 ver 1:0 cap d2078c106f0466 ecap f020de
[    0.321987] DMAR: DRHD base: 0x000000ebffc000 flags: 0x1
[    0.332800] DMAR: dmar1: reg_base_addr ebffc000 ver 1:0 cap d2078c106f0466 ecap f020de
[    0.342131] DMAR: RMRR base: 0x000000bddbd000 end: 0x000000bddd3fff
[    0.349414] DMAR: ATSR flags: 0x0
[    0.353396] DMAR-IR: IOAPIC id 2 under DRHD base  0xfbffe000 IOMMU 0
[    0.360777] DMAR-IR: IOAPIC id 0 under DRHD base  0xebffc000 IOMMU 1
[    0.368157] DMAR-IR: IOAPIC id 1 under DRHD base  0xebffc000 IOMMU 1
[    0.375536] DMAR-IR: HPET id 0 under DRHD base 0xebffc000
[    0.381850] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping.
[    0.392925] DMAR-IR: Enabled IRQ remapping in x2apic mode
[    0.399230] x2apic enabled
[    0.402533] Switched APIC routing to cluster x2apic.
[    0.409103] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.426087] TSC deadline timer enabled
[    0.430588] smpboot: CPU0: Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (family: 0x6, model: 0x3e, stepping: 0x4)
[    0.442570] Performance Events: PEBS fmt1+, 16-deep LBR, IvyBridge events, full-width counters, Intel PMU driver.
[    0.454929] ... version:                3
[    0.459681] ... bit width:              48
[    0.464528] ... generic registers:      4
[    0.469280] ... value mask:             0000ffffffffffff
[    0.475490] ... max period:             0000ffffffffffff
[    0.481701] ... fixed-purpose events:   3
[    0.486451] ... event mask:             000000070000000f
[    0.496806] x86: Booting SMP configuration:
[    0.501753] .... node  #0, CPUs:          #1
[    0.511846] microcode: CPU1 microcode updated early to revision 0x428, date = 2014-05-29
[    0.535097] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
[    0.544673]    #2
[    0.553192] microcode: CPU2 microcode updated early to revision 0x428, date = 2014-05-29
[    0.565639]    #3
[    0.569204] microcode: CPU3 microcode updated early to revision 0x428, date = 2014-05-29
[    0.581657]    #4
[    0.585249] microcode: CPU4 microcode updated early to revision 0x428, date = 2014-05-29
[    0.597723]    #5
[    0.601278] microcode: CPU5 microcode updated early to revision 0x428, date = 2014-05-29
[    0.613738]    #6
[    0.617496] microcode: CPU6 microcode updated early to revision 0x428, date = 2014-05-29
[    0.629956]    #7
[    0.633481] microcode: CPU7 microcode updated early to revision 0x428, date = 2014-05-29
[    0.645933]    #8
[    0.649459] microcode: CPU8 microcode updated early to revision 0x428, date = 2014-05-29
[    0.661903]    #9
[    0.665403] microcode: CPU9 microcode updated early to revision 0x428, date = 2014-05-29
[    0.677832]   #10
[    0.681513] microcode: CPU10 microcode updated early to revision 0x428, date = 2014-05-29
[    0.694041]   #11
[    0.697523] microcode: CPU11 microcode updated early to revision 0x428, date = 2014-05-29
[    0.710071] 
[    0.712007] .... node  #1, CPUs:    #12
[    0.719436] microcode: CPU12 microcode updated early to revision 0x428, date = 2014-05-29
[    0.809024]   #13
[    0.814348] microcode: CPU13 microcode updated early to revision 0x428, date = 2014-05-29
[    0.827688]   #14
[    0.833232] microcode: CPU14 microcode updated early to revision 0x428, date = 2014-05-29
[    0.846607]   #15
[    0.851928] microcode: CPU15 microcode updated early to revision 0x428, date = 2014-05-29
[    0.865311]   #16
[    0.870717] microcode: CPU16 microcode updated early to revision 0x428, date = 2014-05-29
[    0.884138]   #17
[    0.889440] microcode: CPU17 microcode updated early to revision 0x428, date = 2014-05-29
[    0.902845]   #18
[    0.908370] microcode: CPU18 microcode updated early to revision 0x428, date = 2014-05-29
[    0.921762]   #19
[    0.927000] microcode: CPU19 microcode updated early to revision 0x428, date = 2014-05-29
[    0.940384]   #20
[    0.945628] microcode: CPU20 microcode updated early to revision 0x428, date = 2014-05-29
[    0.958977]   #21
[    0.964161] microcode: CPU21 microcode updated early to revision 0x428, date = 2014-05-29
[    0.977486]   #22
[    0.982828] microcode: CPU22 microcode updated early to revision 0x428, date = 2014-05-29
[    0.996129]   #23
[    1.001273] microcode: CPU23 microcode updated early to revision 0x428, date = 2014-05-29
[    1.014574] 
[    1.016509] .... node  #0, CPUs:    #24  #25  #26  #27  #28  #29  #30  #31  #32  #33  #34  #35
[    1.079793] .... node  #1, CPUs:    #36  #37  #38  #39  #40  #41  #42  #43  #44  #45  #46  #47
[    1.166965] x86: Booted up 2 nodes, 48 CPUs
[    1.172393] smpboot: Total of 48 processors activated (258734.54 BogoMIPS)
[    1.307005] devtmpfs: initialized
[    1.311059] memory block size : 1024MB
[    1.318055] PM: Registering ACPI NVS region [mem 0xbac80000-0xbb019fff] (3776512 bytes)
[    1.327531] PM: Registering ACPI NVS region [mem 0xbd957000-0xbdb5bfff] (2117632 bytes)
[    1.336979] PM: Registering ACPI NVS region [mem 0xbdde7000-0xbde2bfff] (282624 bytes)
[    1.346309] PM: Registering ACPI NVS region [mem 0xbdf00000-0xbdf00fff] (4096 bytes)
[    1.355439] PM: Registering ACPI NVS region [mem 0xbdf1f000-0xbdffffff] (921600 bytes)
[    1.365126] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
[    1.377380] atomic64_test: passed for x86-64 platform with CX8 and with SSE
[    1.385440] pinctrl core: initialized pinctrl subsystem
[    1.391703] RTC time:  7:30:42, date: 09/26/15
[    1.398311] NET: Registered protocol family 16
[    1.409803] cpuidle: using governor menu
[    1.414505] Simple Boot Flag at 0x4f set to 0x80
[    1.420209] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
[    1.429150] ACPI: bus type PCI registered
[    1.433904] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    1.441841] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xc0000000-0xcfffffff] (base 0xc0000000)
[    1.452727] PCI: MMCONFIG at [mem 0xc0000000-0xcfffffff] reserved in E820
[    1.460607] PCI: Using configuration type 1 for base access
[    1.468247] perf_event_intel: PMU erratum BJ122, BV98, HSD29 worked around, HT is on
[    1.486296] ACPI: Added _OSI(Module Device)
[    1.491250] ACPI: Added _OSI(Processor Device)
[    1.496491] ACPI: Added _OSI(3.0 _SCP Extensions)
[    1.502022] ACPI: Added _OSI(Processor Aggregator Device)
[    1.523402] ACPI: Executed 1 blocks of module-level executable AML code
[    1.643237] ACPI: Interpreter enabled
[    1.647611] ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_] (20150818/hwxface-580)
[    1.658557] ACPI: (supports S0 S1 S3 S4 S5)
[    1.663502] ACPI: Using IOAPIC for interrupt routing
[    1.669348] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    1.704544] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7e])
[    1.711734] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    1.721660] acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug PME AER PCIeCapability]
[    1.731086] acpi PNP0A08:00: FADT indicates ASPM is unsupported, using BIOS configuration
[    1.741005] PCI host bridge to bus 0000:00
[    1.745861] pci_bus 0000:00: root bus resource [bus 00-7e]
[    1.752267] pci_bus 0000:00: root bus resource [io  0x0000-0xbfff window]
[    1.760129] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[    1.768971] pci_bus 0000:00: root bus resource [mem 0x000c0000-0x000c3fff window]
[    1.777809] pci_bus 0000:00: root bus resource [mem 0x000c4000-0x000c7fff window]
[    1.786649] pci_bus 0000:00: root bus resource [mem 0x000c8000-0x000cbfff window]
[    1.795490] pci_bus 0000:00: root bus resource [mem 0x000cc000-0x000cffff window]
[    1.804331] pci_bus 0000:00: root bus resource [mem 0x000d0000-0x000d3fff window]
[    1.813170] pci_bus 0000:00: root bus resource [mem 0x000d4000-0x000d7fff window]
[    1.822011] pci_bus 0000:00: root bus resource [mem 0x000d8000-0x000dbfff window]
[    1.830853] pci_bus 0000:00: root bus resource [mem 0x000dc000-0x000dffff window]
[    1.839699] pci_bus 0000:00: root bus resource [mem 0x000e0000-0x000e3fff window]
[    1.848531] pci_bus 0000:00: root bus resource [mem 0x000e4000-0x000e7fff window]
[    1.857371] pci_bus 0000:00: root bus resource [mem 0x000e8000-0x000ebfff window]
[    1.866211] pci_bus 0000:00: root bus resource [mem 0x000ec000-0x000effff window]
[    1.875053] pci_bus 0000:00: root bus resource [mem 0x000f0000-0x000fffff window]
[    1.883893] pci_bus 0000:00: root bus resource [mem 0xd0000000-0xebffffff window]
[    1.892734] pci_bus 0000:00: root bus resource [mem 0x380000000000-0x38007fffffff window]
[    1.902361] pci 0000:00:00.0: [8086:0e00] type 00 class 0x060000
[    1.909407] pci 0000:00:00.0: PME# supported from D0 D3hot D3cold
[    1.916578] pci 0000:00:01.0: [8086:0e02] type 01 class 0x060400
[    1.923630] pci 0000:00:01.0: PME# supported from D0 D3hot D3cold
[    1.930768] pci 0000:00:01.0: System wakeup disabled by ACPI
[    1.937403] pci 0000:00:01.1: [8086:0e03] type 01 class 0x060400
[    1.944456] pci 0000:00:01.1: PME# supported from D0 D3hot D3cold
[    1.951596] pci 0000:00:01.1: System wakeup disabled by ACPI
[    1.958231] pci 0000:00:02.0: [8086:0e04] type 01 class 0x060400
[    1.965272] pci 0000:00:02.0: PME# supported from D0 D3hot D3cold
[    1.972400] pci 0000:00:02.0: System wakeup disabled by ACPI
[    1.979033] pci 0000:00:02.2: [8086:0e06] type 01 class 0x060400
[    1.986083] pci 0000:00:02.2: PME# supported from D0 D3hot D3cold
[    1.993221] pci 0000:00:02.2: System wakeup disabled by ACPI
[    1.999848] pci 0000:00:03.0: [8086:0e08] type 01 class 0x060400
[    2.006902] pci 0000:00:03.0: PME# supported from D0 D3hot D3cold
[    2.014040] pci 0000:00:03.0: System wakeup disabled by ACPI
[    2.020664] pci 0000:00:03.2: [8086:0e0a] type 01 class 0x060400
[    2.027715] pci 0000:00:03.2: PME# supported from D0 D3hot D3cold
[    2.034855] pci 0000:00:03.2: System wakeup disabled by ACPI
[    2.041490] pci 0000:00:04.0: [8086:0e20] type 00 class 0x088000
[    2.048499] pci 0000:00:04.0: reg 0x10: [mem 0xebf90000-0xebf93fff 64bit]
[    2.056473] pci 0000:00:04.1: [8086:0e21] type 00 class 0x088000
[    2.063482] pci 0000:00:04.1: reg 0x10: [mem 0xebf80000-0xebf83fff 64bit]
[    2.071455] pci 0000:00:04.2: [8086:0e22] type 00 class 0x088000
[    2.078466] pci 0000:00:04.2: reg 0x10: [mem 0xebf70000-0xebf73fff 64bit]
[    2.086437] pci 0000:00:04.3: [8086:0e23] type 00 class 0x088000
[    2.093447] pci 0000:00:04.3: reg 0x10: [mem 0xebf60000-0xebf63fff 64bit]
[    2.101420] pci 0000:00:04.4: [8086:0e24] type 00 class 0x088000
[    2.108421] pci 0000:00:04.4: reg 0x10: [mem 0xebf50000-0xebf53fff 64bit]
[    2.116391] pci 0000:00:04.5: [8086:0e25] type 00 class 0x088000
[    2.123401] pci 0000:00:04.5: reg 0x10: [mem 0xebf40000-0xebf43fff 64bit]
[    2.131375] pci 0000:00:04.6: [8086:0e26] type 00 class 0x088000
[    2.138388] pci 0000:00:04.6: reg 0x10: [mem 0xebf30000-0xebf33fff 64bit]
[    2.146357] pci 0000:00:04.7: [8086:0e27] type 00 class 0x088000
[    2.153367] pci 0000:00:04.7: reg 0x10: [mem 0xebf20000-0xebf23fff 64bit]
[    2.161339] pci 0000:00:05.0: [8086:0e28] type 00 class 0x088000
[    2.168435] pci 0000:00:05.1: [8086:0e29] type 00 class 0x088000
[    2.175550] pci 0000:00:05.2: [8086:0e2a] type 00 class 0x088000
[    2.182649] pci 0000:00:05.4: [8086:0e2c] type 00 class 0x080020
[    2.189653] pci 0000:00:05.4: reg 0x10: [mem 0xd0d60000-0xd0d60fff]
[    2.197044] pci 0000:00:05.6: [8086:0e39] type 00 class 0x110100
[    2.204143] pci 0000:00:06.0: [8086:0e10] type 00 class 0x088000
[    2.211240] pci 0000:00:06.1: [8086:0e11] type 00 class 0x088000
[    2.218336] pci 0000:00:06.2: [8086:0e12] type 00 class 0x088000
[    2.225435] pci 0000:00:06.3: [8086:0e13] type 00 class 0x088000
[    2.232531] pci 0000:00:06.4: [8086:0e14] type 00 class 0x088000
[    2.239634] pci 0000:00:06.5: [8086:0e15] type 00 class 0x088000
[    2.246732] pci 0000:00:06.6: [8086:0e16] type 00 class 0x088000
[    2.253832] pci 0000:00:06.7: [8086:0e17] type 00 class 0x088000
[    2.260929] pci 0000:00:07.0: [8086:0e18] type 00 class 0x088000
[    2.268030] pci 0000:00:07.1: [8086:0e19] type 00 class 0x088000
[    2.275129] pci 0000:00:07.2: [8086:0e1a] type 00 class 0x088000
[    2.282228] pci 0000:00:07.3: [8086:0e1b] type 00 class 0x088000
[    2.293975] pci 0000:00:07.4: [8086:0e1c] type 00 class 0x088000
[    2.301096] pci 0000:00:1a.0: [8086:1d2d] type 00 class 0x0c0320
[    2.308115] pci 0000:00:1a.0: reg 0x10: [mem 0xd0d20000-0xd0d203ff]
[    2.315462] pci 0000:00:1a.0: PME# supported from D0 D3hot D3cold
[    2.322610] pci 0000:00:1a.0: System wakeup disabled by ACPI
[    2.329243] pci 0000:00:1c.0: [8086:1d10] type 01 class 0x060400
[    2.336304] pci 0000:00:1c.0: PME# supported from D0 D3hot D3cold
[    2.343440] pci 0000:00:1c.0: System wakeup disabled by ACPI
[    2.350083] pci 0000:00:1c.7: [8086:1d1e] type 01 class 0x060400
[    2.357138] pci 0000:00:1c.7: PME# supported from D0 D3hot D3cold
[    2.364272] pci 0000:00:1c.7: System wakeup disabled by ACPI
[    2.370907] pci 0000:00:1d.0: [8086:1d26] type 00 class 0x0c0320
[    2.377925] pci 0000:00:1d.0: reg 0x10: [mem 0xd0d10000-0xd0d103ff]
[    2.385270] pci 0000:00:1d.0: PME# supported from D0 D3hot D3cold
[    2.392413] pci 0000:00:1d.0: System wakeup disabled by ACPI
[    2.399044] pci 0000:00:1e.0: [8086:244e] type 01 class 0x060401
[    2.406115] pci 0000:00:1e.0: System wakeup disabled by ACPI
[    2.412749] pci 0000:00:1f.0: [8086:1d41] type 00 class 0x060100
[    2.419906] pci 0000:00:1f.2: [8086:1d02] type 00 class 0x010601
[    2.426917] pci 0000:00:1f.2: reg 0x10: [io  0x4070-0x4077]
[    2.433426] pci 0000:00:1f.2: reg 0x14: [io  0x4060-0x4063]
[    2.439936] pci 0000:00:1f.2: reg 0x18: [io  0x4050-0x4057]
[    2.446445] pci 0000:00:1f.2: reg 0x1c: [io  0x4040-0x4043]
[    2.452956] pci 0000:00:1f.2: reg 0x20: [io  0x4020-0x403f]
[    2.459464] pci 0000:00:1f.2: reg 0x24: [mem 0xd0d00000-0xd0d007ff]
[    2.466769] pci 0000:00:1f.2: PME# supported from D3hot
[    2.472954] pci 0000:00:1f.3: [8086:1d22] type 00 class 0x0c0500
[    2.479952] pci 0000:00:1f.3: reg 0x10: [mem 0xebf10000-0xebf100ff 64bit]
[    2.487823] pci 0000:00:1f.3: reg 0x20: [io  0x4000-0x401f]
[    2.494412] pci 0000:00:1f.6: [8086:1d24] type 00 class 0x118000
[    2.501428] pci 0000:00:1f.6: reg 0x10: [mem 0xebf00000-0xebf00fff 64bit]
[    2.509464] pci 0000:00:01.0: PCI bridge to [bus 01-03]
[    2.515581] pci 0000:00:01.0:   bridge window [io  0x3000-0x3fff]
[    2.522672] pci 0000:00:01.0:   bridge window [mem 0xd0b00000-0xd0cfffff]
[    2.530539] pci 0000:00:01.0:   bridge window [mem 0xeb000000-0xeb9fffff 64bit pref]
[    2.539706] pci 0000:01:00.0: [8086:1d74] type 01 class 0x060400
[    2.546738] pci 0000:01:00.0: reg 0x10: [mem 0xd0c00000-0xd0c03fff]
[    2.554082] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold
[    2.563276] pci 0000:01:00.0: PCI bridge to [bus 02-03]
[    2.569415] pci 0000:01:00.0:   bridge window [io  0x3000-0x3fff]
[    2.576522] pci 0000:01:00.0:   bridge window [mem 0xd0b00000-0xd0bfffff]
[    2.584410] pci 0000:01:00.0:   bridge window [mem 0xeb000000-0xeb9fffff 64bit pref]
[    2.593571] pci 0000:02:08.0: [8086:1d3f] type 01 class 0x060400
[    2.600655] pci 0000:02:08.0: PME# supported from D0 D3hot D3cold
[    2.607879] pci 0000:02:08.0: PCI bridge to [bus 03]
[    2.613714] pci 0000:02:08.0:   bridge window [io  0x3000-0x3fff]
[    2.620813] pci 0000:02:08.0:   bridge window [mem 0xd0b00000-0xd0bfffff]
[    2.628700] pci 0000:02:08.0:   bridge window [mem 0xeb000000-0xeb9fffff 64bit pref]
[    2.637853] pci 0000:03:00.0: [8086:1d68] type 00 class 0x010700
[    2.644890] pci 0000:03:00.0: reg 0x10: [mem 0xeb800000-0xeb807fff 64bit pref]
[    2.653470] pci 0000:03:00.0: reg 0x18: [mem 0xeb000000-0xeb7fffff 64bit pref]
[    2.662037] pci 0000:03:00.0: reg 0x20: [io  0x3100-0x31ff]
[    2.668568] pci 0000:03:00.0: reg 0x24: [io  0x3000-0x30ff]
[    2.675159] pci 0000:03:00.0: reg 0x164: [mem 0xeb810000-0xeb817fff 64bit pref]
[    2.683806] pci 0000:03:00.0: VF(n) BAR0 space: [mem 0xeb810000-0xeb907fff 64bit pref] (contains BAR0 for 31 VFs)
[    2.695942] pci 0000:03:00.3: [8086:1d70] type 00 class 0x0c0500
[    2.702979] pci 0000:03:00.3: reg 0x10: [mem 0xd0b10000-0xd0b10fff]
[    2.710313] pci 0000:03:00.3: reg 0x20: [io  0x3220-0x323f]
[    2.716878] pci 0000:03:00.3: PME# supported from D0 D3hot D3cold
[    2.724049] pci 0000:03:00.4: [8086:1d71] type 00 class 0x0c0500
[    2.731085] pci 0000:03:00.4: reg 0x10: [mem 0xd0b00000-0xd0b00fff]
[    2.738416] pci 0000:03:00.4: reg 0x20: [io  0x3200-0x321f]
[    2.744972] pci 0000:03:00.4: PME# supported from D0 D3hot D3cold
[    2.752246] acpiphp: Slot [2] registered
[    2.756922] pci 0000:00:01.1: PCI bridge to [bus 04]
[    2.762827] acpiphp: Slot [2-2] registered
[    2.767693] pci 0000:00:02.0: PCI bridge to [bus 05]
[    2.773593] acpiphp: Slot [2-3] registered
[    2.778460] pci 0000:00:02.2: PCI bridge to [bus 06]
[    2.784363] acpiphp: Slot [2-4] registered
[    2.789230] pci 0000:00:03.0: PCI bridge to [bus 07]
[    2.795131] acpiphp: Slot [2-5] registered
[    2.800001] pci 0000:00:03.2: PCI bridge to [bus 08]
[    2.805881] pci 0000:00:1c.0: PCI bridge to [bus 09-0a]
[    2.811998] pci 0000:00:1c.0:   bridge window [io  0x2000-0x2fff]
[    2.819087] pci 0000:00:1c.0:   bridge window [mem 0xd0900000-0xd0afffff]
[    2.826974] pci 0000:09:00.0: [8086:1521] type 00 class 0x020000
[    2.833996] pci 0000:09:00.0: reg 0x10: [mem 0xd0960000-0xd097ffff]
[    2.841300] pci 0000:09:00.0: reg 0x18: [io  0x2060-0x207f]
[    2.847814] pci 0000:09:00.0: reg 0x1c: [mem 0xd09b0000-0xd09b3fff]
[    2.855201] pci 0000:09:00.0: PME# supported from D0 D3hot D3cold
[    2.862331] pci 0000:09:00.0: reg 0x184: [mem 0xd0aa0000-0xd0aa3fff]
[    2.869712] pci 0000:09:00.0: VF(n) BAR0 space: [mem 0xd0aa0000-0xd0abffff] (contains BAR0 for 8 VFs)
[    2.880529] pci 0000:09:00.0: reg 0x190: [mem 0xd0a80000-0xd0a83fff]
[    2.887906] pci 0000:09:00.0: VF(n) BAR3 space: [mem 0xd0a80000-0xd0a9ffff] (contains BAR3 for 8 VFs)
[    2.898767] pci 0000:09:00.0: System wakeup disabled by ACPI
[    2.905413] pci 0000:09:00.1: [8086:1521] type 00 class 0x020000
[    2.912445] pci 0000:09:00.1: reg 0x10: [mem 0xd0940000-0xd095ffff]
[    2.919748] pci 0000:09:00.1: reg 0x18: [io  0x2040-0x205f]
[    2.926261] pci 0000:09:00.1: reg 0x1c: [mem 0xd09a0000-0xd09a3fff]
[    2.933642] pci 0000:09:00.1: PME# supported from D0 D3hot D3cold
[    2.940772] pci 0000:09:00.1: reg 0x184: [mem 0xd0a60000-0xd0a63fff]
[    2.948154] pci 0000:09:00.1: VF(n) BAR0 space: [mem 0xd0a60000-0xd0a7ffff] (contains BAR0 for 8 VFs)
[    2.958976] pci 0000:09:00.1: reg 0x190: [mem 0xd0a40000-0xd0a43fff]
[    2.966354] pci 0000:09:00.1: VF(n) BAR3 space: [mem 0xd0a40000-0xd0a5ffff] (contains BAR3 for 8 VFs)
[    2.977258] pci 0000:09:00.2: [8086:1521] type 00 class 0x020000
[    2.984279] pci 0000:09:00.2: reg 0x10: [mem 0xd0920000-0xd093ffff]
[    2.991581] pci 0000:09:00.2: reg 0x18: [io  0x2020-0x203f]
[    2.998097] pci 0000:09:00.2: reg 0x1c: [mem 0xd0990000-0xd0993fff]
[    3.005477] pci 0000:09:00.2: PME# supported from D0 D3hot D3cold
[    3.012606] pci 0000:09:00.2: reg 0x184: [mem 0xd0a20000-0xd0a23fff]
[    3.019976] pci 0000:09:00.2: VF(n) BAR0 space: [mem 0xd0a20000-0xd0a3ffff] (contains BAR0 for 8 VFs)
[    3.030796] pci 0000:09:00.2: reg 0x190: [mem 0xd0a00000-0xd0a03fff]
[    3.038175] pci 0000:09:00.2: VF(n) BAR3 space: [mem 0xd0a00000-0xd0a1ffff] (contains BAR3 for 8 VFs)
[    3.049082] pci 0000:09:00.3: [8086:1521] type 00 class 0x020000
[    3.056112] pci 0000:09:00.3: reg 0x10: [mem 0xd0900000-0xd091ffff]
[    3.063416] pci 0000:09:00.3: reg 0x18: [io  0x2000-0x201f]
[    3.069931] pci 0000:09:00.3: reg 0x1c: [mem 0xd0980000-0xd0983fff]
[    3.077312] pci 0000:09:00.3: PME# supported from D0 D3hot D3cold
[    3.084441] pci 0000:09:00.3: reg 0x184: [mem 0xd09e0000-0xd09e3fff]
[    3.091818] pci 0000:09:00.3: VF(n) BAR0 space: [mem 0xd09e0000-0xd09fffff] (contains BAR0 for 8 VFs)
[    3.102636] pci 0000:09:00.3: reg 0x190: [mem 0xd09c0000-0xd09c3fff]
[    3.110012] pci 0000:09:00.3: VF(n) BAR3 space: [mem 0xd09c0000-0xd09dffff] (contains BAR3 for 8 VFs)
[    3.122886] pci 0000:00:1c.7: PCI bridge to [bus 0b]
[    3.128713] pci 0000:00:1c.7:   bridge window [mem 0xd0000000-0xd08fffff]
[    3.136581] pci 0000:00:1c.7:   bridge window [mem 0xea000000-0xeaffffff 64bit pref]
[    3.145734] pci 0000:0b:00.0: [102b:0522] type 00 class 0x030000
[    3.152775] pci 0000:0b:00.0: reg 0x10: [mem 0xea000000-0xeaffffff pref]
[    3.160547] pci 0000:0b:00.0: reg 0x14: [mem 0xd0810000-0xd0813fff]
[    3.167833] pci 0000:0b:00.0: reg 0x18: [mem 0xd0000000-0xd07fffff]
[    3.175173] pci 0000:0b:00.0: reg 0x30: [mem 0xd0800000-0xd080ffff pref]
[    3.183010] pci 0000:0b:00.0: System wakeup disabled by ACPI
[    3.191683] pci 0000:00:1e.0: PCI bridge to [bus 0c] (subtractive decode)
[    3.199556] pci 0000:00:1e.0:   bridge window [io  0x0000-0xbfff window] (subtractive decode)
[    3.209567] pci 0000:00:1e.0:   bridge window [mem 0x000a0000-0x000bffff window] (subtractive decode)
[    3.220355] pci 0000:00:1e.0:   bridge window [mem 0x000c0000-0x000c3fff window] (subtractive decode)
[    3.231139] pci 0000:00:1e.0:   bridge window [mem 0x000c4000-0x000c7fff window] (subtractive decode)
[    3.241922] pci 0000:00:1e.0:   bridge window [mem 0x000c8000-0x000cbfff window] (subtractive decode)
[    3.252706] pci 0000:00:1e.0:   bridge window [mem 0x000cc000-0x000cffff window] (subtractive decode)
[    3.263489] pci 0000:00:1e.0:   bridge window [mem 0x000d0000-0x000d3fff window] (subtractive decode)
[    3.274272] pci 0000:00:1e.0:   bridge window [mem 0x000d4000-0x000d7fff window] (subtractive decode)
[    3.285058] pci 0000:00:1e.0:   bridge window [mem 0x000d8000-0x000dbfff window] (subtractive decode)
[    3.295846] pci 0000:00:1e.0:   bridge window [mem 0x000dc000-0x000dffff window] (subtractive decode)
[    3.306636] pci 0000:00:1e.0:   bridge window [mem 0x000e0000-0x000e3fff window] (subtractive decode)
[    3.317420] pci 0000:00:1e.0:   bridge window [mem 0x000e4000-0x000e7fff window] (subtractive decode)
[    3.328209] pci 0000:00:1e.0:   bridge window [mem 0x000e8000-0x000ebfff window] (subtractive decode)
[    3.338997] pci 0000:00:1e.0:   bridge window [mem 0x000ec000-0x000effff window] (subtractive decode)
[    3.349780] pci 0000:00:1e.0:   bridge window [mem 0x000f0000-0x000fffff window] (subtractive decode)
[    3.360564] pci 0000:00:1e.0:   bridge window [mem 0xd0000000-0xebffffff window] (subtractive decode)
[    3.371351] pci 0000:00:1e.0:   bridge window [mem 0x380000000000-0x38007fffffff window] (subtractive decode)
[    3.382997] pci_bus 0000:00: on NUMA node 0
[    3.388532] ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 10 *11 12 14 15)
[    3.397392] ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 *5 6 10 11 12 14 15)
[    3.406249] ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 *10 11 12 14 15)
[    3.415107] ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 10 *11 12 14 15)
[    3.423965] ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[    3.439098] ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[    3.449576] ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 10 11 12 14 15) *0, disabled.
[    3.460041] ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 *10 11 12 14 15)
[    3.468976] ACPI: PCI Root Bridge [PCI1] (domain 0000 [bus 80-fe])
[    3.476165] acpi PNP0A08:01: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    3.485936] acpi PNP0A08:01: _OSC: OS now controls [PCIeHotplug PME AER PCIeCapability]
[    3.495360] acpi PNP0A08:01: FADT indicates ASPM is unsupported, using BIOS configuration
[    3.505154] PCI host bridge to bus 0000:80
[    3.510005] pci_bus 0000:80: root bus resource [bus 80-fe]
[    3.516411] pci_bus 0000:80: root bus resource [io  0xc000-0xffff window]
[    3.524273] pci_bus 0000:80: root bus resource [mem 0xec000000-0xfbffffff window]
[    3.533116] pci_bus 0000:80: root bus resource [mem 0x380080000000-0x3800ffffffff window]
[    3.542738] pci 0000:80:02.0: [8086:0e04] type 01 class 0x060400
[    3.549799] pci 0000:80:02.0: PME# supported from D0 D3hot D3cold
[    3.556918] pci 0000:80:02.0: System wakeup disabled by ACPI
[    3.563558] pci 0000:80:04.0: [8086:0e20] type 00 class 0x088000
[    3.570571] pci 0000:80:04.0: reg 0x10: [mem 0xfbf70000-0xfbf73fff 64bit]
[    3.578533] pci 0000:80:04.1: [8086:0e21] type 00 class 0x088000
[    3.585548] pci 0000:80:04.1: reg 0x10: [mem 0xfbf60000-0xfbf63fff 64bit]
[    3.593507] pci 0000:80:04.2: [8086:0e22] type 00 class 0x088000
[    3.600519] pci 0000:80:04.2: reg 0x10: [mem 0xfbf50000-0xfbf53fff 64bit]
[    3.608481] pci 0000:80:04.3: [8086:0e23] type 00 class 0x088000
[    3.615493] pci 0000:80:04.3: reg 0x10: [mem 0xfbf40000-0xfbf43fff 64bit]
[    3.623451] pci 0000:80:04.4: [8086:0e24] type 00 class 0x088000
[    3.630460] pci 0000:80:04.4: reg 0x10: [mem 0xfbf30000-0xfbf33fff 64bit]
[    3.638420] pci 0000:80:04.5: [8086:0e25] type 00 class 0x088000
[    3.645431] pci 0000:80:04.5: reg 0x10: [mem 0xfbf20000-0xfbf23fff 64bit]
[    3.653389] pci 0000:80:04.6: [8086:0e26] type 00 class 0x088000
[    3.660398] pci 0000:80:04.6: reg 0x10: [mem 0xfbf10000-0xfbf13fff 64bit]
[    3.668360] pci 0000:80:04.7: [8086:0e27] type 00 class 0x088000
[    3.675372] pci 0000:80:04.7: reg 0x10: [mem 0xfbf00000-0xfbf03fff 64bit]
[    3.683329] pci 0000:80:05.0: [8086:0e28] type 00 class 0x088000
[    3.690416] pci 0000:80:05.1: [8086:0e29] type 00 class 0x088000
[    3.697517] pci 0000:80:05.2: [8086:0e2a] type 00 class 0x088000
[    3.704597] pci 0000:80:05.4: [8086:0e2c] type 00 class 0x080020
[    3.711602] pci 0000:80:05.4: reg 0x10: [mem 0xec500000-0xec500fff]
[    3.718983] pci 0000:80:05.6: [8086:0e39] type 00 class 0x110100
[    3.726070] pci 0000:80:06.0: [8086:0e10] type 00 class 0x088000
[    3.733155] pci 0000:80:06.1: [8086:0e11] type 00 class 0x088000
[    3.740245] pci 0000:80:06.2: [8086:0e12] type 00 class 0x088000
[    3.747331] pci 0000:80:06.3: [8086:0e13] type 00 class 0x088000
[    3.754418] pci 0000:80:06.4: [8086:0e14] type 00 class 0x088000
[    3.761506] pci 0000:80:06.5: [8086:0e15] type 00 class 0x088000
[    3.768595] pci 0000:80:06.6: [8086:0e16] type 00 class 0x088000
[    3.775680] pci 0000:80:06.7: [8086:0e17] type 00 class 0x088000
[    3.782769] pci 0000:80:07.0: [8086:0e18] type 00 class 0x088000
[    3.789854] pci 0000:80:07.1: [8086:0e19] type 00 class 0x088000
[    3.796945] pci 0000:80:07.2: [8086:0e1a] type 00 class 0x088000
[    3.804031] pci 0000:80:07.3: [8086:0e1b] type 00 class 0x088000
[    3.811117] pci 0000:80:07.4: [8086:0e1c] type 00 class 0x088000
[    3.818261] pci 0000:80:02.0: PCI bridge to [bus 81-82]
[    3.824369] pci 0000:80:02.0:   bridge window [io  0xc000-0xcfff]
[    3.831458] pci 0000:80:02.0:   bridge window [mem 0xec000000-0xec4fffff]
[    3.839324] pci 0000:80:02.0:   bridge window [mem 0xfbb00000-0xfbefffff 64bit pref]
[    3.848465] pci 0000:81:00.0: [8086:151c] type 00 class 0x020000
[    3.855474] pci 0000:81:00.0: reg 0x10: [mem 0xec200000-0xec3fffff 64bit]
[    3.863342] pci 0000:81:00.0: reg 0x18: [io  0xc020-0xc03f]
[    3.869856] pci 0000:81:00.0: reg 0x20: [mem 0xec410000-0xec413fff 64bit]
[    3.877750] pci 0000:81:00.0: PME# supported from D0 D3hot D3cold
[    3.884862] pci 0000:81:00.0: reg 0x184: [mem 0xfbe00000-0xfbe03fff 64bit pref]
[    3.893500] pci 0000:81:00.0: VF(n) BAR0 space: [mem 0xfbe00000-0xfbefffff 64bit pref] (contains BAR0 for 64 VFs)
[    3.905460] pci 0000:81:00.0: reg 0x190: [mem 0xfbd00000-0xfbd03fff 64bit pref]
[    3.914106] pci 0000:81:00.0: VF(n) BAR3 space: [mem 0xfbd00000-0xfbdfffff 64bit pref] (contains BAR3 for 64 VFs)
[    3.926201] pci 0000:81:00.1: [8086:151c] type 00 class 0x020000
[    3.933208] pci 0000:81:00.1: reg 0x10: [mem 0xec000000-0xec1fffff 64bit]
[    3.941079] pci 0000:81:00.1: reg 0x18: [io  0xc000-0xc01f]
[    3.947593] pci 0000:81:00.1: reg 0x20: [mem 0xec400000-0xec403fff 64bit]
[    3.955486] pci 0000:81:00.1: PME# supported from D0 D3hot D3cold
[    3.962595] pci 0000:81:00.1: reg 0x184: [mem 0xfbc00000-0xfbc03fff 64bit pref]
[    3.971243] pci 0000:81:00.1: VF(n) BAR0 space: [mem 0xfbc00000-0xfbcfffff 64bit pref] (contains BAR0 for 64 VFs)
[    3.983205] pci 0000:81:00.1: reg 0x190: [mem 0xfbb00000-0xfbb03fff 64bit pref]
[    3.991852] pci 0000:81:00.1: VF(n) BAR3 space: [mem 0xfbb00000-0xfbbfffff 64bit pref] (contains BAR3 for 64 VFs)
[    4.005856] pci_bus 0000:80: on NUMA node 1
[    4.016249] ACPI: PCI Root Bridge [UCR0] (domain 0000 [bus 7f])
[    4.023136] acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    4.032757] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[    4.040477] PCI host bridge to bus 0000:7f
[    4.045328] pci_bus 0000:7f: root bus resource [bus 7f]
[    4.051448] pci 0000:7f:08.0: [8086:0e80] type 00 class 0x088000
[    4.058489] pci 0000:7f:08.2: [8086:0e32] type 00 class 0x110100
[    4.065525] pci 0000:7f:08.3: [8086:0e83] type 00 class 0x088000
[    4.072568] pci 0000:7f:08.4: [8086:0e84] type 00 class 0x088000
[    4.079614] pci 0000:7f:08.5: [8086:0e85] type 00 class 0x088000
[    4.086654] pci 0000:7f:08.6: [8086:0e86] type 00 class 0x088000
[    4.093694] pci 0000:7f:08.7: [8086:0e87] type 00 class 0x088000
[    4.100740] pci 0000:7f:09.0: [8086:0e90] type 00 class 0x088000
[    4.107773] pci 0000:7f:09.2: [8086:0e33] type 00 class 0x110100
[    4.114808] pci 0000:7f:09.3: [8086:0e93] type 00 class 0x088000
[    4.121844] pci 0000:7f:09.4: [8086:0e94] type 00 class 0x088000
[    4.128896] pci 0000:7f:09.5: [8086:0e95] type 00 class 0x088000
[    4.135934] pci 0000:7f:09.6: [8086:0e96] type 00 class 0x088000
[    4.142974] pci 0000:7f:0a.0: [8086:0ec0] type 00 class 0x088000
[    4.150002] pci 0000:7f:0a.1: [8086:0ec1] type 00 class 0x088000
[    4.157035] pci 0000:7f:0a.2: [8086:0ec2] type 00 class 0x088000
[    4.164063] pci 0000:7f:0a.3: [8086:0ec3] type 00 class 0x088000
[    4.171095] pci 0000:7f:0a.4: [8086:0ec4] type 00 class 0x088000
[    4.178115] pci 0000:7f:0a.5: [8086:0ec5] type 00 class 0x088000
[    4.185148] pci 0000:7f:0a.6: [8086:0ec6] type 00 class 0x088000
[    4.192177] pci 0000:7f:0a.7: [8086:0ec7] type 00 class 0x088000
[    4.199208] pci 0000:7f:0b.0: [8086:0e1e] type 00 class 0x088000
[    4.206234] pci 0000:7f:0b.2: [8086:0e7d] type 00 class 0x088000
[    4.213263] pci 0000:7f:0b.3: [8086:0e1f] type 00 class 0x088000
[    4.220290] pci 0000:7f:0c.0: [8086:0ee0] type 00 class 0x088000
[    4.227321] pci 0000:7f:0c.1: [8086:0ee2] type 00 class 0x088000
[    4.234350] pci 0000:7f:0c.2: [8086:0ee4] type 00 class 0x088000
[    4.241380] pci 0000:7f:0c.3: [8086:0ee6] type 00 class 0x088000
[    4.248406] pci 0000:7f:0c.4: [8086:0ee8] type 00 class 0x088000
[    4.255434] pci 0000:7f:0c.5: [8086:0eea] type 00 class 0x088000
[    4.262461] pci 0000:7f:0d.0: [8086:0ee1] type 00 class 0x088000
[    4.269489] pci 0000:7f:0d.1: [8086:0ee3] type 00 class 0x088000
[    4.276517] pci 0000:7f:0d.2: [8086:0ee5] type 00 class 0x088000
[    4.283548] pci 0000:7f:0d.3: [8086:0ee7] type 00 class 0x088000
[    4.290575] pci 0000:7f:0d.4: [8086:0ee9] type 00 class 0x088000
[    4.297605] pci 0000:7f:0d.5: [8086:0eeb] type 00 class 0x088000
[    4.304639] pci 0000:7f:0e.0: [8086:0ea0] type 00 class 0x088000
[    4.311673] pci 0000:7f:0e.1: [8086:0e30] type 00 class 0x110100
[    4.318703] pci 0000:7f:0e.2: [8086:0e70] type 00 class 0x088000
[    4.325743] pci 0000:7f:0f.0: [8086:0ea8] type 00 class 0x088000
[    4.332782] pci 0000:7f:0f.1: [8086:0e71] type 00 class 0x088000
[    4.339826] pci 0000:7f:0f.2: [8086:0eaa] type 00 class 0x088000
[    4.346863] pci 0000:7f:0f.3: [8086:0eab] type 00 class 0x088000
[    4.353907] pci 0000:7f:0f.4: [8086:0eac] type 00 class 0x088000
[    4.360944] pci 0000:7f:0f.5: [8086:0ead] type 00 class 0x088000
[    4.367991] pci 0000:7f:10.0: [8086:0eb0] type 00 class 0x088000
[    4.375029] pci 0000:7f:10.1: [8086:0eb1] type 00 class 0x088000
[    4.382068] pci 0000:7f:10.2: [8086:0eb2] type 00 class 0x088000
[    4.389107] pci 0000:7f:10.3: [8086:0eb3] type 00 class 0x088000
[    4.396148] pci 0000:7f:10.4: [8086:0eb4] type 00 class 0x088000
[    4.403190] pci 0000:7f:10.5: [8086:0eb5] type 00 class 0x088000
[    4.410236] pci 0000:7f:10.6: [8086:0eb6] type 00 class 0x088000
[    4.417275] pci 0000:7f:10.7: [8086:0eb7] type 00 class 0x088000
[    4.424317] pci 0000:7f:11.0: [8086:0eb8] type 00 class 0x088000
[    4.431359] pci 0000:7f:11.4: [8086:0ebc] type 00 class 0x088000
[    4.438400] pci 0000:7f:11.5: [8086:0ebd] type 00 class 0x088000
[    4.445430] pci 0000:7f:11.6: [8086:0ebe] type 00 class 0x088000
[    4.452468] pci 0000:7f:11.7: [8086:0ebf] type 00 class 0x088000
[    4.459506] pci 0000:7f:13.0: [8086:0e1d] type 00 class 0x088000
[    4.466538] pci 0000:7f:13.1: [8086:0e34] type 00 class 0x110100
[    4.473569] pci 0000:7f:13.4: [8086:0e81] type 00 class 0x088000
[    4.480604] pci 0000:7f:13.5: [8086:0e36] type 00 class 0x110100
[    4.487636] pci 0000:7f:13.6: [8086:0e37] type 00 class 0x110100
[    4.494663] pci 0000:7f:16.0: [8086:0ec8] type 00 class 0x088000
[    4.501693] pci 0000:7f:16.1: [8086:0ec9] type 00 class 0x088000
[    4.508723] pci 0000:7f:16.2: [8086:0eca] type 00 class 0x088000
[    4.515765] pci 0000:7f:1c.0: [8086:0e60] type 00 class 0x088000
[    4.522799] pci 0000:7f:1c.1: [8086:0e38] type 00 class 0x110100
[    4.529833] pci 0000:7f:1c.2: [8086:0e78] type 00 class 0x088000
[    4.536875] pci 0000:7f:1d.0: [8086:0e68] type 00 class 0x088000
[    4.543913] pci 0000:7f:1d.1: [8086:0e79] type 00 class 0x088000
[    4.550955] pci 0000:7f:1d.2: [8086:0e6a] type 00 class 0x088000
[    4.557995] pci 0000:7f:1d.3: [8086:0e6b] type 00 class 0x088000
[    4.565036] pci 0000:7f:1d.4: [8086:0e6c] type 00 class 0x088000
[    4.572065] pci 0000:7f:1d.5: [8086:0e6d] type 00 class 0x088000
[    4.579113] pci 0000:7f:1e.0: [8086:0ef0] type 00 class 0x088000
[    4.586154] pci 0000:7f:1e.1: [8086:0ef1] type 00 class 0x088000
[    4.593184] pci 0000:7f:1e.2: [8086:0ef2] type 00 class 0x088000
[    4.600226] pci 0000:7f:1e.3: [8086:0ef3] type 00 class 0x088000
[    4.607268] pci 0000:7f:1e.4: [8086:0ef4] type 00 class 0x088000
[    4.614308] pci 0000:7f:1e.5: [8086:0ef5] type 00 class 0x088000
[    4.621351] pci 0000:7f:1e.6: [8086:0ef6] type 00 class 0x088000
[    4.628392] pci 0000:7f:1e.7: [8086:0ef7] type 00 class 0x088000
[    4.635436] pci 0000:7f:1f.0: [8086:0e98] type 00 class 0x088000
[    4.642475] pci 0000:7f:1f.1: [8086:0e99] type 00 class 0x088000
[    4.654144] pci 0000:7f:1f.2: [8086:0e9a] type 00 class 0x088000
[    4.661182] pci 0000:7f:1f.3: [8086:0e9b] type 00 class 0x088000
[    4.668288] ACPI: PCI Root Bridge [UCR1] (domain 0000 [bus ff])
[    4.675181] acpi PNP0A03:01: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
[    4.684801] acpi PNP0A03:01: _OSC failed (AE_NOT_FOUND); disabling ASPM
[    4.692520] PCI host bridge to bus 0000:ff
[    4.697365] pci_bus 0000:ff: root bus resource [bus ff]
[    4.703485] pci 0000:ff:08.0: [8086:0e80] type 00 class 0x088000
[    4.710525] pci 0000:ff:08.2: [8086:0e32] type 00 class 0x110100
[    4.717561] pci 0000:ff:08.3: [8086:0e83] type 00 class 0x088000
[    4.724612] pci 0000:ff:08.4: [8086:0e84] type 00 class 0x088000
[    4.731665] pci 0000:ff:08.5: [8086:0e85] type 00 class 0x088000
[    4.738713] pci 0000:ff:08.6: [8086:0e86] type 00 class 0x088000
[    4.745759] pci 0000:ff:08.7: [8086:0e87] type 00 class 0x088000
[    4.752810] pci 0000:ff:09.0: [8086:0e90] type 00 class 0x088000
[    4.759844] pci 0000:ff:09.2: [8086:0e33] type 00 class 0x110100
[    4.766883] pci 0000:ff:09.3: [8086:0e93] type 00 class 0x088000
[    4.773919] pci 0000:ff:09.4: [8086:0e94] type 00 class 0x088000
[    4.780972] pci 0000:ff:09.5: [8086:0e95] type 00 class 0x088000
[    4.788020] pci 0000:ff:09.6: [8086:0e96] type 00 class 0x088000
[    4.795064] pci 0000:ff:0a.0: [8086:0ec0] type 00 class 0x088000
[    4.802096] pci 0000:ff:0a.1: [8086:0ec1] type 00 class 0x088000
[    4.809129] pci 0000:ff:0a.2: [8086:0ec2] type 00 class 0x088000
[    4.816164] pci 0000:ff:0a.3: [8086:0ec3] type 00 class 0x088000
[    4.823201] pci 0000:ff:0a.4: [8086:0ec4] type 00 class 0x088000
[    4.830236] pci 0000:ff:0a.5: [8086:0ec5] type 00 class 0x088000
[    4.837271] pci 0000:ff:0a.6: [8086:0ec6] type 00 class 0x088000
[    4.844305] pci 0000:ff:0a.7: [8086:0ec7] type 00 class 0x088000
[    4.851340] pci 0000:ff:0b.0: [8086:0e1e] type 00 class 0x088000
[    4.858372] pci 0000:ff:0b.2: [8086:0e7d] type 00 class 0x088000
[    4.865397] pci 0000:ff:0b.3: [8086:0e1f] type 00 class 0x088000
[    4.872430] pci 0000:ff:0c.0: [8086:0ee0] type 00 class 0x088000
[    4.879466] pci 0000:ff:0c.1: [8086:0ee2] type 00 class 0x088000
[    4.886500] pci 0000:ff:0c.2: [8086:0ee4] type 00 class 0x088000
[    4.893539] pci 0000:ff:0c.3: [8086:0ee6] type 00 class 0x088000
[    4.900575] pci 0000:ff:0c.4: [8086:0ee8] type 00 class 0x088000
[    4.907611] pci 0000:ff:0c.5: [8086:0eea] type 00 class 0x088000
[    4.914646] pci 0000:ff:0d.0: [8086:0ee1] type 00 class 0x088000
[    4.921680] pci 0000:ff:0d.1: [8086:0ee3] type 00 class 0x088000
[    4.928714] pci 0000:ff:0d.2: [8086:0ee5] type 00 class 0x088000
[    4.935752] pci 0000:ff:0d.3: [8086:0ee7] type 00 class 0x088000
[    4.942788] pci 0000:ff:0d.4: [8086:0ee9] type 00 class 0x088000
[    4.949825] pci 0000:ff:0d.5: [8086:0eeb] type 00 class 0x088000
[    4.956861] pci 0000:ff:0e.0: [8086:0ea0] type 00 class 0x088000
[    4.963904] pci 0000:ff:0e.1: [8086:0e30] type 00 class 0x110100
[    4.970943] pci 0000:ff:0e.2: [8086:0e70] type 00 class 0x088000
[    4.977995] pci 0000:ff:0f.0: [8086:0ea8] type 00 class 0x088000
[    4.985045] pci 0000:ff:0f.1: [8086:0e71] type 00 class 0x088000
[    4.992097] pci 0000:ff:0f.2: [8086:0eaa] type 00 class 0x088000
[    4.999143] pci 0000:ff:0f.3: [8086:0eab] type 00 class 0x088000
[    5.006193] pci 0000:ff:0f.4: [8086:0eac] type 00 class 0x088000
[    5.013241] pci 0000:ff:0f.5: [8086:0ead] type 00 class 0x088000
[    5.020295] pci 0000:ff:10.0: [8086:0eb0] type 00 class 0x088000
[    5.027344] pci 0000:ff:10.1: [8086:0eb1] type 00 class 0x088000
[    5.034386] pci 0000:ff:10.2: [8086:0eb2] type 00 class 0x088000
[    5.041433] pci 0000:ff:10.3: [8086:0eb3] type 00 class 0x088000
[    5.048484] pci 0000:ff:10.4: [8086:0eb4] type 00 class 0x088000
[    5.055531] pci 0000:ff:10.5: [8086:0eb5] type 00 class 0x088000
[    5.062581] pci 0000:ff:10.6: [8086:0eb6] type 00 class 0x088000
[    5.069632] pci 0000:ff:10.7: [8086:0eb7] type 00 class 0x088000
[    5.076682] pci 0000:ff:11.0: [8086:0eb8] type 00 class 0x088000
[    5.083737] pci 0000:ff:11.4: [8086:0ebc] type 00 class 0x088000
[    5.090787] pci 0000:ff:11.5: [8086:0ebd] type 00 class 0x088000
[    5.097834] pci 0000:ff:11.6: [8086:0ebe] type 00 class 0x088000
[    5.104883] pci 0000:ff:11.7: [8086:0ebf] type 00 class 0x088000
[    5.111929] pci 0000:ff:13.0: [8086:0e1d] type 00 class 0x088000
[    5.118964] pci 0000:ff:13.1: [8086:0e34] type 00 class 0x110100
[    5.126006] pci 0000:ff:13.4: [8086:0e81] type 00 class 0x088000
[    5.133046] pci 0000:ff:13.5: [8086:0e36] type 00 class 0x110100
[    5.140084] pci 0000:ff:13.6: [8086:0e37] type 00 class 0x110100
[    5.147128] pci 0000:ff:16.0: [8086:0ec8] type 00 class 0x088000
[    5.154167] pci 0000:ff:16.1: [8086:0ec9] type 00 class 0x088000
[    5.161206] pci 0000:ff:16.2: [8086:0eca] type 00 class 0x088000
[    5.168254] pci 0000:ff:1c.0: [8086:0e60] type 00 class 0x088000
[    5.175300] pci 0000:ff:1c.1: [8086:0e38] type 00 class 0x110100
[    5.182348] pci 0000:ff:1c.2: [8086:0e78] type 00 class 0x088000
[    5.189406] pci 0000:ff:1d.0: [8086:0e68] type 00 class 0x088000
[    5.196450] pci 0000:ff:1d.1: [8086:0e79] type 00 class 0x088000
[    5.203507] pci 0000:ff:1d.2: [8086:0e6a] type 00 class 0x088000
[    5.210559] pci 0000:ff:1d.3: [8086:0e6b] type 00 class 0x088000
[    5.217618] pci 0000:ff:1d.4: [8086:0e6c] type 00 class 0x088000
[    5.224667] pci 0000:ff:1d.5: [8086:0e6d] type 00 class 0x088000
[    5.231717] pci 0000:ff:1e.0: [8086:0ef0] type 00 class 0x088000
[    5.238774] pci 0000:ff:1e.1: [8086:0ef1] type 00 class 0x088000
[    5.245829] pci 0000:ff:1e.2: [8086:0ef2] type 00 class 0x088000
[    5.252883] pci 0000:ff:1e.3: [8086:0ef3] type 00 class 0x088000
[    5.259938] pci 0000:ff:1e.4: [8086:0ef4] type 00 class 0x088000
[    5.266994] pci 0000:ff:1e.5: [8086:0ef5] type 00 class 0x088000
[    5.274049] pci 0000:ff:1e.6: [8086:0ef6] type 00 class 0x088000
[    5.281101] pci 0000:ff:1e.7: [8086:0ef7] type 00 class 0x088000
[    5.288155] pci 0000:ff:1f.0: [8086:0e98] type 00 class 0x088000
[    5.295209] pci 0000:ff:1f.1: [8086:0e99] type 00 class 0x088000
[    5.302262] pci 0000:ff:1f.2: [8086:0e9a] type 00 class 0x088000
[    5.309317] pci 0000:ff:1f.3: [8086:0e9b] type 00 class 0x088000
[    5.316519] ACPI: Enabled 5 GPEs in block 00 to 3F
[    5.322591] vgaarb: setting as boot device: PCI:0000:0b:00.0
[    5.329223] vgaarb: device added: PCI:0000:0b:00.0,decodes=io+mem,owns=io+mem,locks=none
[    5.338909] vgaarb: loaded
[    5.342227] vgaarb: bridge control possible 0000:0b:00.0
[    5.348828] SCSI subsystem initialized
[    5.353343] libata version 3.00 loaded.
[    5.357978] ACPI: bus type USB registered
[    5.362786] usbcore: registered new interface driver usbfs
[    5.369232] usbcore: registered new interface driver hub
[    5.375970] usbcore: registered new device driver usb
[    5.382860] PCI: Using ACPI for IRQ routing
[    5.394564] PCI: pci_cache_line_size set to 64 bytes
[    5.401096] e820: reserve RAM buffer [mem 0x0009bc00-0x0009ffff]
[    5.408111] e820: reserve RAM buffer [mem 0xba763000-0xbbffffff]
[    5.415708] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0, 0, 0, 0, 0
[    5.423716] hpet0: 8 comparators, 64-bit 14.318180 MHz counter
[    5.432890] clocksource: Switched to clocksource hpet
[    5.457827] pnp: PnP ACPI init
[    5.461988] system 00:00: [io  0x0680-0x069f] has been reserved
[    5.468915] system 00:00: [io  0xffff] has been reserved
[    5.475152] system 00:00: [io  0xffff] has been reserved
[    5.481392] system 00:00: [io  0xffff] has been reserved
[    5.487631] system 00:00: [io  0x0400-0x0453] could not be reserved
[    5.494931] system 00:00: [io  0x0458-0x047f] has been reserved
[    5.501849] system 00:00: [io  0x0500-0x057f] has been reserved
[    5.508766] system 00:00: [io  0x164e-0x164f] has been reserved
[    5.515688] system 00:00: Plug and Play ACPI device, IDs PNP0c02 (active)
[    5.523640] pnp 00:01: Plug and Play ACPI device, IDs PNP0b00 (active)
[    5.531443] system 00:02: [io  0x0454-0x0457] has been reserved
[    5.538374] system 00:02: Plug and Play ACPI device, IDs INT3f0d PNP0c02 (active)
[    5.547640] pnp 00:03: [dma 0 disabled]
[    5.552327] pnp 00:03: Plug and Play ACPI device, IDs PNP0501 (active)
[    5.560181] pnp 00:04: [dma 0 disabled]
[    5.564853] pnp 00:04: Plug and Play ACPI device, IDs PNP0501 (active)
[    5.573236] system 00:05: [mem 0xfed1c000-0xfed1ffff] has been reserved
[    5.580946] system 00:05: [mem 0xebfff000-0xebffffff] has been reserved
[    5.588644] system 00:05: [mem 0xc0000000-0xcfffffff] has been reserved
[    5.596341] system 00:05: [mem 0xfed20000-0xfed3ffff] has been reserved
[    5.604035] system 00:05: [mem 0xfed45000-0xfed8ffff] has been reserved
[    5.611731] system 00:05: [mem 0xff000000-0xffffffff] could not be reserved
[    5.619815] system 00:05: [mem 0xfee00000-0xfeefffff] could not be reserved
[    5.627899] system 00:05: [mem 0xfec00000-0xfecfffff] could not be reserved
[    5.635985] system 00:05: [mem 0xd0d70000-0xd0d70fff] has been reserved
[    5.643679] system 00:05: Plug and Play ACPI device, IDs PNP0c02 (active)
[    5.651820] system 00:06: [mem 0xebffc000-0xebffdfff] could not be reserved
[    5.659912] system 00:06: Plug and Play ACPI device, IDs PNP0c02 (active)
[    5.668275] system 00:07: [mem 0xfbffe000-0xfbffffff] could not be reserved
[    5.676369] system 00:07: Plug and Play ACPI device, IDs PNP0c02 (active)
[    5.684444] system 00:08: [mem 0x00000000-0x0009cfff] could not be reserved
[    5.692537] system 00:08: Plug and Play ACPI device, IDs PNP0c01 (active)
[    5.700973] pnp: PnP ACPI: found 9 devices
[    5.713729] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
[    5.724319] pci 0000:02:08.0: PCI bridge to [bus 03]
[    5.730191] pci 0000:02:08.0:   bridge window [io  0x3000-0x3fff]
[    5.737332] pci 0000:02:08.0:   bridge window [mem 0xd0b00000-0xd0bfffff]
[    5.745245] pci 0000:02:08.0:   bridge window [mem 0xeb000000-0xeb9fffff 64bit pref]
[    5.754438] pci 0000:01:00.0: PCI bridge to [bus 02-03]
[    5.760598] pci 0000:01:00.0:   bridge window [io  0x3000-0x3fff]
[    5.767732] pci 0000:01:00.0:   bridge window [mem 0xd0b00000-0xd0bfffff]
[    5.775668] pci 0000:01:00.0:   bridge window [mem 0xeb000000-0xeb9fffff 64bit pref]
[    5.784862] pci 0000:00:01.0: PCI bridge to [bus 01-03]
[    5.791004] pci 0000:00:01.0:   bridge window [io  0x3000-0x3fff]
[    5.798118] pci 0000:00:01.0:   bridge window [mem 0xd0b00000-0xd0cfffff]
[    5.806011] pci 0000:00:01.0:   bridge window [mem 0xeb000000-0xeb9fffff 64bit pref]
[    5.815184] pci 0000:00:01.1: PCI bridge to [bus 04]
[    5.821042] pci 0000:00:02.0: PCI bridge to [bus 05]
[    5.826900] pci 0000:00:02.2: PCI bridge to [bus 06]
[    5.832757] pci 0000:00:03.0: PCI bridge to [bus 07]
[    5.838623] pci 0000:00:03.2: PCI bridge to [bus 08]
[    5.844482] pci 0000:00:1c.0: PCI bridge to [bus 09-0a]
[    5.850623] pci 0000:00:1c.0:   bridge window [io  0x2000-0x2fff]
[    5.857736] pci 0000:00:1c.0:   bridge window [mem 0xd0900000-0xd0afffff]
[    5.865633] pci 0000:00:1c.7: PCI bridge to [bus 0b]
[    5.871485] pci 0000:00:1c.7:   bridge window [mem 0xd0000000-0xd08fffff]
[    5.879377] pci 0000:00:1c.7:   bridge window [mem 0xea000000-0xeaffffff 64bit pref]
[    5.888557] pci 0000:00:1e.0: PCI bridge to [bus 0c]
[    5.894419] pci_bus 0000:00: resource 4 [io  0x0000-0xbfff window]
[    5.906537] pci_bus 0000:00: resource 5 [mem 0x000a0000-0x000bffff window]
[    5.914522] pci_bus 0000:00: resource 6 [mem 0x000c0000-0x000c3fff window]
[    5.922509] pci_bus 0000:00: resource 7 [mem 0x000c4000-0x000c7fff window]
[    5.930496] pci_bus 0000:00: resource 8 [mem 0x000c8000-0x000cbfff window]
[    5.938482] pci_bus 0000:00: resource 9 [mem 0x000cc000-0x000cffff window]
[    5.946468] pci_bus 0000:00: resource 10 [mem 0x000d0000-0x000d3fff window]
[    5.954549] pci_bus 0000:00: resource 11 [mem 0x000d4000-0x000d7fff window]
[    5.962631] pci_bus 0000:00: resource 12 [mem 0x000d8000-0x000dbfff window]
[    5.970715] pci_bus 0000:00: resource 13 [mem 0x000dc000-0x000dffff window]
[    5.978800] pci_bus 0000:00: resource 14 [mem 0x000e0000-0x000e3fff window]
[    5.986887] pci_bus 0000:00: resource 15 [mem 0x000e4000-0x000e7fff window]
[    5.994970] pci_bus 0000:00: resource 16 [mem 0x000e8000-0x000ebfff window]
[    6.003051] pci_bus 0000:00: resource 17 [mem 0x000ec000-0x000effff window]
[    6.011133] pci_bus 0000:00: resource 18 [mem 0x000f0000-0x000fffff window]
[    6.019215] pci_bus 0000:00: resource 19 [mem 0xd0000000-0xebffffff window]
[    6.027298] pci_bus 0000:00: resource 20 [mem 0x380000000000-0x38007fffffff window]
[    6.036371] pci_bus 0000:01: resource 0 [io  0x3000-0x3fff]
[    6.042896] pci_bus 0000:01: resource 1 [mem 0xd0b00000-0xd0cfffff]
[    6.050201] pci_bus 0000:01: resource 2 [mem 0xeb000000-0xeb9fffff 64bit pref]
[    6.058789] pci_bus 0000:02: resource 0 [io  0x3000-0x3fff]
[    6.065308] pci_bus 0000:02: resource 1 [mem 0xd0b00000-0xd0bfffff]
[    6.072614] pci_bus 0000:02: resource 2 [mem 0xeb000000-0xeb9fffff 64bit pref]
[    6.081198] pci_bus 0000:03: resource 0 [io  0x3000-0x3fff]
[    6.087727] pci_bus 0000:03: resource 1 [mem 0xd0b00000-0xd0bfffff]
[    6.095032] pci_bus 0000:03: resource 2 [mem 0xeb000000-0xeb9fffff 64bit pref]
[    6.103621] pci_bus 0000:09: resource 0 [io  0x2000-0x2fff]
[    6.110149] pci_bus 0000:09: resource 1 [mem 0xd0900000-0xd0afffff]
[    6.117453] pci_bus 0000:0b: resource 1 [mem 0xd0000000-0xd08fffff]
[    6.124758] pci_bus 0000:0b: resource 2 [mem 0xea000000-0xeaffffff 64bit pref]
[    6.133346] pci_bus 0000:0c: resource 4 [io  0x0000-0xbfff window]
[    6.140547] pci_bus 0000:0c: resource 5 [mem 0x000a0000-0x000bffff window]
[    6.148534] pci_bus 0000:0c: resource 6 [mem 0x000c0000-0x000c3fff window]
[    6.156520] pci_bus 0000:0c: resource 7 [mem 0x000c4000-0x000c7fff window]
[    6.164506] pci_bus 0000:0c: resource 8 [mem 0x000c8000-0x000cbfff window]
[    6.172494] pci_bus 0000:0c: resource 9 [mem 0x000cc000-0x000cffff window]
[    6.180478] pci_bus 0000:0c: resource 10 [mem 0x000d0000-0x000d3fff window]
[    6.188565] pci_bus 0000:0c: resource 11 [mem 0x000d4000-0x000d7fff window]
[    6.196651] pci_bus 0000:0c: resource 12 [mem 0x000d8000-0x000dbfff window]
[    6.204734] pci_bus 0000:0c: resource 13 [mem 0x000dc000-0x000dffff window]
[    6.212817] pci_bus 0000:0c: resource 14 [mem 0x000e0000-0x000e3fff window]
[    6.220899] pci_bus 0000:0c: resource 15 [mem 0x000e4000-0x000e7fff window]
[    6.228983] pci_bus 0000:0c: resource 16 [mem 0x000e8000-0x000ebfff window]
[    6.237067] pci_bus 0000:0c: resource 17 [mem 0x000ec000-0x000effff window]
[    6.245151] pci_bus 0000:0c: resource 18 [mem 0x000f0000-0x000fffff window]
[    6.253235] pci_bus 0000:0c: resource 19 [mem 0xd0000000-0xebffffff window]
[    6.261317] pci_bus 0000:0c: resource 20 [mem 0x380000000000-0x38007fffffff window]
[    6.270405] pci 0000:80:02.0: PCI bridge to [bus 81-82]
[    6.276547] pci 0000:80:02.0:   bridge window [io  0xc000-0xcfff]
[    6.283652] pci 0000:80:02.0:   bridge window [mem 0xec000000-0xec4fffff]
[    6.291543] pci 0000:80:02.0:   bridge window [mem 0xfbb00000-0xfbefffff 64bit pref]
[    6.300719] pci_bus 0000:80: resource 4 [io  0xc000-0xffff window]
[    6.307927] pci_bus 0000:80: resource 5 [mem 0xec000000-0xfbffffff window]
[    6.315916] pci_bus 0000:80: resource 6 [mem 0x380080000000-0x3800ffffffff window]
[    6.324897] pci_bus 0000:81: resource 0 [io  0xc000-0xcfff]
[    6.331426] pci_bus 0000:81: resource 1 [mem 0xec000000-0xec4fffff]
[    6.338734] pci_bus 0000:81: resource 2 [mem 0xfbb00000-0xfbefffff 64bit pref]
[    6.347853] NET: Registered protocol family 2
[    6.355143] TCP established hash table entries: 524288 (order: 10, 4194304 bytes)
[    6.365630] TCP bind hash table entries: 65536 (order: 8, 1048576 bytes)
[    6.373720] TCP: Hash tables configured (established 524288 bind 65536)
[    6.381683] UDP hash table entries: 32768 (order: 8, 1048576 bytes)
[    6.389441] UDP-Lite hash table entries: 32768 (order: 8, 1048576 bytes)
[    6.399054] NET: Registered protocol family 1
[    6.446427] pci 0000:0b:00.0: Video device with shadowed ROM
[    6.453540] PCI: CLS 64 bytes, default 64
[    6.458479] Unpacking initramfs...
[    7.987210] Freeing initrd memory: 47084K (ffff88007d204000 - ffff88007ffff000)
[    7.996224] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[    8.003734] software IO TLB [mem 0xb6763000-0xba763000] (64MB) mapped at [ffff8800b6763000-ffff8800ba762fff]
[    8.015915] RAPL PMU detected, API unit is 2^-32 Joules, 3 fixed counters 163840 ms ovfl timer
[    8.026065] hw unit of domain pp0-core 2^-16 Joules
[    8.031815] hw unit of domain package 2^-16 Joules
[    8.037468] hw unit of domain dram 2^-16 Joules
[    8.057083] microcode: CPU0 sig=0x306e4, pf=0x1, revision=0x428
[    8.063985] microcode: CPU1 sig=0x306e4, pf=0x1, revision=0x428
[    8.070904] microcode: CPU2 sig=0x306e4, pf=0x1, revision=0x428
[    8.077822] microcode: CPU3 sig=0x306e4, pf=0x1, revision=0x428
[    8.084731] microcode: CPU4 sig=0x306e4, pf=0x1, revision=0x428
[    8.091648] microcode: CPU5 sig=0x306e4, pf=0x1, revision=0x428
[    8.098563] microcode: CPU6 sig=0x306e4, pf=0x1, revision=0x428
[    8.105478] microcode: CPU7 sig=0x306e4, pf=0x1, revision=0x428
[    8.112392] microcode: CPU8 sig=0x306e4, pf=0x1, revision=0x428
[    8.119309] microcode: CPU9 sig=0x306e4, pf=0x1, revision=0x428
[    8.126223] microcode: CPU10 sig=0x306e4, pf=0x1, revision=0x428
[    8.133234] microcode: CPU11 sig=0x306e4, pf=0x1, revision=0x428
[    8.140247] microcode: CPU12 sig=0x306e4, pf=0x1, revision=0x428
[    8.147261] microcode: CPU13 sig=0x306e4, pf=0x1, revision=0x428
[    8.154288] microcode: CPU14 sig=0x306e4, pf=0x1, revision=0x428
[    8.161313] microcode: CPU15 sig=0x306e4, pf=0x1, revision=0x428
[    8.168339] microcode: CPU16 sig=0x306e4, pf=0x1, revision=0x428
[    8.175366] microcode: CPU17 sig=0x306e4, pf=0x1, revision=0x428
[    8.182393] microcode: CPU18 sig=0x306e4, pf=0x1, revision=0x428
[    8.189419] microcode: CPU19 sig=0x306e4, pf=0x1, revision=0x428
[    8.196446] microcode: CPU20 sig=0x306e4, pf=0x1, revision=0x428
[    8.203469] microcode: CPU21 sig=0x306e4, pf=0x1, revision=0x428
[    8.210495] microcode: CPU22 sig=0x306e4, pf=0x1, revision=0x428
[    8.217520] microcode: CPU23 sig=0x306e4, pf=0x1, revision=0x428
[    8.224543] microcode: CPU24 sig=0x306e4, pf=0x1, revision=0x428
[    8.231553] microcode: CPU25 sig=0x306e4, pf=0x1, revision=0x428
[    8.238573] microcode: CPU26 sig=0x306e4, pf=0x1, revision=0x428
[    8.245587] microcode: CPU27 sig=0x306e4, pf=0x1, revision=0x428
[    8.252600] microcode: CPU28 sig=0x306e4, pf=0x1, revision=0x428
[    8.259613] microcode: CPU29 sig=0x306e4, pf=0x1, revision=0x428
[    8.266625] microcode: CPU30 sig=0x306e4, pf=0x1, revision=0x428
[    8.273638] microcode: CPU31 sig=0x306e4, pf=0x1, revision=0x428
[    8.280649] microcode: CPU32 sig=0x306e4, pf=0x1, revision=0x428
[    8.287660] microcode: CPU33 sig=0x306e4, pf=0x1, revision=0x428
[    8.294670] microcode: CPU34 sig=0x306e4, pf=0x1, revision=0x428
[    8.301680] microcode: CPU35 sig=0x306e4, pf=0x1, revision=0x428
[    8.308694] microcode: CPU36 sig=0x306e4, pf=0x1, revision=0x428
[    8.315723] microcode: CPU37 sig=0x306e4, pf=0x1, revision=0x428
[    8.322744] microcode: CPU38 sig=0x306e4, pf=0x1, revision=0x428
[    8.329769] microcode: CPU39 sig=0x306e4, pf=0x1, revision=0x428
[    8.336794] microcode: CPU40 sig=0x306e4, pf=0x1, revision=0x428
[    8.343819] microcode: CPU41 sig=0x306e4, pf=0x1, revision=0x428
[    8.350840] microcode: CPU42 sig=0x306e4, pf=0x1, revision=0x428
[    8.357860] microcode: CPU43 sig=0x306e4, pf=0x1, revision=0x428
[    8.364883] microcode: CPU44 sig=0x306e4, pf=0x1, revision=0x428
[    8.371906] microcode: CPU45 sig=0x306e4, pf=0x1, revision=0x428
[    8.378930] microcode: CPU46 sig=0x306e4, pf=0x1, revision=0x428
[    8.385955] microcode: CPU47 sig=0x306e4, pf=0x1, revision=0x428
[    8.393121] microcode: Microcode Update Driver: v2.00 <tigran@aivazian.fsnet.co.uk>, Peter Oruba
[    8.414248] futex hash table entries: 65536 (order: 10, 4194304 bytes)
[    8.423146] audit: initializing netlink subsys (disabled)
[    8.429534] audit: type=2000 audit(1443252643.536:1): initialized
[    8.438175] Initialise system trusted keyring
[    8.443742] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    8.454028] zbud: loaded
[    8.457820] VFS: Disk quotas dquot_6.6.0
[    8.462906] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    8.472768] Key type big_key registered
[    8.477366] SELinux:  Registering netfilter hooks
[    8.492454] NET: Registered protocol family 38
[    8.497745] Key type asymmetric registered
[    8.502629] Asymmetric key parser 'x509' registered
[    8.508500] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    8.517709] io scheduler noop registered
[    8.522405] io scheduler deadline registered
[    8.527623] io scheduler cfq registered (default)
[    8.539030] aer 0000:00:01.0:pcie02: service driver aer loaded
[    8.545943] aer 0000:00:01.1:pcie02: service driver aer loaded
[    8.552818] aer 0000:00:02.0:pcie02: service driver aer loaded
[    8.559693] aer 0000:00:02.2:pcie02: service driver aer loaded
[    8.566568] aer 0000:00:03.0:pcie02: service driver aer loaded
[    8.573437] aer 0000:00:03.2:pcie02: service driver aer loaded
[    8.580311] aer 0000:80:02.0:pcie02: service driver aer loaded
[    8.587165] pcieport 0000:00:01.0: Signaling PME through PCIe PME interrupt
[    8.595252] pcieport 0000:01:00.0: Signaling PME through PCIe PME interrupt
[    8.603338] pcieport 0000:02:08.0: Signaling PME through PCIe PME interrupt
[    8.611424] pci 0000:03:00.0: Signaling PME through PCIe PME interrupt
[    8.619022] pci 0000:03:00.3: Signaling PME through PCIe PME interrupt
[    8.626621] pci 0000:03:00.4: Signaling PME through PCIe PME interrupt
[    8.634222] pcie_pme 0000:00:01.0:pcie01: service driver pcie_pme loaded
[    8.642026] pcieport 0000:00:01.1: Signaling PME through PCIe PME interrupt
[    8.650115] pcie_pme 0000:00:01.1:pcie01: service driver pcie_pme loaded
[    8.657922] pcieport 0000:00:02.0: Signaling PME through PCIe PME interrupt
[    8.666007] pcie_pme 0000:00:02.0:pcie01: service driver pcie_pme loaded
[    8.673813] pcieport 0000:00:02.2: Signaling PME through PCIe PME interrupt
[    8.681902] pcie_pme 0000:00:02.2:pcie01: service driver pcie_pme loaded
[    8.689705] pcieport 0000:00:03.0: Signaling PME through PCIe PME interrupt
[    8.697796] pcie_pme 0000:00:03.0:pcie01: service driver pcie_pme loaded
[    8.705607] pcieport 0000:00:03.2: Signaling PME through PCIe PME interrupt
[    8.713695] pcie_pme 0000:00:03.2:pcie01: service driver pcie_pme loaded
[    8.721525] pcieport 0000:00:1c.0: Signaling PME through PCIe PME interrupt
[    8.729612] pci 0000:09:00.0: Signaling PME through PCIe PME interrupt
[    8.742100] pci 0000:09:00.1: Signaling PME through PCIe PME interrupt
[    8.749696] pci 0000:09:00.2: Signaling PME through PCIe PME interrupt
[    8.757297] pci 0000:09:00.3: Signaling PME through PCIe PME interrupt
[    8.764897] pcie_pme 0000:00:1c.0:pcie01: service driver pcie_pme loaded
[    8.772728] pcieport 0000:00:1c.7: Signaling PME through PCIe PME interrupt
[    8.780816] pci 0000:0b:00.0: Signaling PME through PCIe PME interrupt
[    8.788418] pcie_pme 0000:00:1c.7:pcie01: service driver pcie_pme loaded
[    8.796224] pcieport 0000:80:02.0: Signaling PME through PCIe PME interrupt
[    8.804312] pci 0000:81:00.0: Signaling PME through PCIe PME interrupt
[    8.811909] pci 0000:81:00.1: Signaling PME through PCIe PME interrupt
[    8.819513] pcie_pme 0000:80:02.0:pcie01: service driver pcie_pme loaded
[    8.827309] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    8.833853] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    8.841628] intel_idle: MWAIT substates: 0x1120
[    8.846992] intel_idle: v0.4 model 0x3E
[    8.851575] intel_idle: lapic_timer_reliable_states 0xffffffff
[    8.859953] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[    8.868719] ACPI: Power Button [PWRF]
[    8.920571] GHES: HEST is not enabled!
[    8.925100] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    8.953104] 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    8.982522] 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
[    8.991817] Non-volatile memory driver v1.3
[    8.996838] Linux agpgart interface v0.103
[    9.005943] ahci 0000:00:1f.2: version 3.0
[    9.011056] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 6 ports 6 Gbps 0x3 impl SATA mode
[    9.015209] tsc: Refined TSC clocksource calibration: 2693.509 MHz
[    9.015213] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x26d34aa491a, max_idle_ns: 440795256568 ns
[    9.039432] ahci 0000:00:1f.2: flags: 64bit ncq sntf pm led clo pio slum part ems apst 
[    9.050766] scsi host0: ahci
[    9.054494] scsi host1: ahci
[    9.058233] scsi host2: ahci
[    9.061954] scsi host3: ahci
[    9.065691] scsi host4: ahci
[    9.069421] scsi host5: ahci
[    9.072944] ata1: SATA max UDMA/133 abar m2048@0xd0d00000 port 0xd0d00100 irq 34
[    9.081690] ata2: SATA max UDMA/133 abar m2048@0xd0d00000 port 0xd0d00180 irq 34
[    9.090435] ata3: DUMMY
[    9.093438] ata4: DUMMY
[    9.096442] ata5: DUMMY
[    9.099446] ata6: DUMMY
[    9.102977] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    9.110596] ehci-pci: EHCI PCI platform driver
[    9.116250] ehci-pci 0000:00:1a.0: EHCI Host Controller
[    9.122480] ehci-pci 0000:00:1a.0: new USB bus registered, assigned bus number 1
[    9.131231] ehci-pci 0000:00:1a.0: debug port 2
[    9.140473] ehci-pci 0000:00:1a.0: cache line size of 64 is not supported
[    9.148354] ehci-pci 0000:00:1a.0: irq 16, io mem 0xd0d20000
[    9.160106] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00
[    9.166851] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    9.174717] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    9.183269] usb usb1: Product: EHCI Host Controller
[    9.188995] usb usb1: Manufacturer: Linux 4.3.0-rc2+ ehci_hcd
[    9.195692] usb usb1: SerialNumber: 0000:00:1a.0
[    9.201306] hub 1-0:1.0: USB hub found
[    9.205780] hub 1-0:1.0: 2 ports detected
[    9.210810] ehci-pci 0000:00:1d.0: EHCI Host Controller
[    9.217034] ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 2
[    9.225792] ehci-pci 0000:00:1d.0: debug port 2
[    9.235032] ehci-pci 0000:00:1d.0: cache line size of 64 is not supported
[    9.242911] ehci-pci 0000:00:1d.0: irq 23, io mem 0xd0d10000
[    9.255060] ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00
[    9.261794] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    9.269660] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    9.278211] usb usb2: Product: EHCI Host Controller
[    9.283935] usb usb2: Manufacturer: Linux 4.3.0-rc2+ ehci_hcd
[    9.290632] usb usb2: SerialNumber: 0000:00:1d.0
[    9.296260] hub 2-0:1.0: USB hub found
[    9.300722] hub 2-0:1.0: 2 ports detected
[    9.305695] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    9.312934] ohci-pci: OHCI PCI platform driver
[    9.318257] uhci_hcd: USB Universal Host Controller Interface driver
[    9.325787] i8042: PNP: No PS/2 controller found. Probing ports directly.
[    9.407036] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.414314] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    9.421738] ata1.00: ATA-8: WDC WD1002FAEX-00Y9A0, 05.01D05, max UDMA/133
[    9.429644] ata1.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[    9.438269] ata2.00: ATAPI: ATAPI   iHAS124   W, HL04, max UDMA/100
[    9.446802] ata1.00: configured for UDMA/133
[    9.451915] ata2.00: configured for UDMA/100
[    9.453575] scsi 0:0:0:0: Direct-Access     ATA      WDC WD1002FAEX-0 1D05 PQ: 0 ANSI: 5
[    9.454333] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    9.454416] sd 0:0:0:0: [sda] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
[    9.454633] sd 0:0:0:0: [sda] Write Protect is off
[    9.454635] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    9.454819] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    9.466775]  sda: sda1
[    9.467574] sd 0:0:0:0: [sda] Attached SCSI disk
[    9.511984] usb 1-1: new high-speed USB device number 2 using ehci-pci
[    9.522103] scsi 1:0:0:0: CD-ROM            ATAPI    iHAS124   W      HL04 PQ: 0 ANSI: 5
[    9.606947] usb 2-1: new high-speed USB device number 2 using ehci-pci
[    9.630366] usb 1-1: New USB device found, idVendor=8087, idProduct=0024
[    9.638145] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    9.646668] hub 1-1:1.0: USB hub found
[    9.651269] hub 1-1:1.0: 6 ports detected
[    9.729328] usb 2-1: New USB device found, idVendor=8087, idProduct=0024
[    9.737106] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    9.745621] hub 2-1:1.0: USB hub found
[    9.750224] hub 2-1:1.0: 8 ports detected
[    9.849861] i8042: Can't read CTR while initializing i8042
[    9.856334] i8042: probe of i8042 failed with error -5
[    9.862514] mousedev: PS/2 mouse device common for all mice
[    9.865094] sr 1:0:0:0: [sr0] scsi3-mmc drive: 188x/125x writer dvd-ram cd/rw xa/form2 cdda tray
[    9.865096] cdrom: Uniform CD-ROM driver Revision: 3.20
[    9.865344] sr 1:0:0:0: Attached scsi CD-ROM sr0
[    9.865490] sr 1:0:0:0: Attached scsi generic sg1 type 5
[    9.897589] rtc_cmos 00:01: RTC can wake from S4
[    9.903299] rtc_cmos 00:01: rtc core: registered rtc_cmos as rtc0
[    9.910462] rtc_cmos 00:01: alarms up to one month, y3k, 242 bytes nvram, hpet irqs
[    9.919699] device-mapper: uevent: version 1.0.3
[    9.925350] device-mapper: ioctl: 4.33.0-ioctl (2015-8-18) initialised: dm-devel@redhat.com
[    9.935420] Intel P-state driver initializing.
[    9.944493] hidraw: raw HID events driver (C) Jiri Kosina
[    9.951014] usbcore: registered new interface driver usbhid
[    9.957549] usbhid: USB HID core driver
[    9.962632] drop_monitor: Initializing network drop monitor service
[    9.970505] ip_tables: (C) 2000-2006 Netfilter Core Team
[    9.976755] Initializing XFRM netlink socket
[    9.981840] NET: Registered protocol family 17
[    9.989513] AVX version of gcm_enc/dec engaged.
[    9.994887] AES CTR mode by8 optimization enabled
[   10.026622] clocksource: Switched to clocksource tsc
[   10.029714] usb 2-1.4: new full-speed USB device number 3 using ehci-pci
[   10.039069] registered taskstats version 1
[   10.039079] Loading compiled-in X.509 certificates
[   10.039955] Loaded X.509 cert 'Build time autogenerated kernel key: cd28390833b39dce97e6aa142acc02320d77becd'
[   10.040027] zswap: loaded using pool lzo/zbud
[   10.041933]   Magic number: 15:191:522
[   10.042084] acpi device:116: hash matches
[   10.045074] rtc_cmos 00:01: setting system clock to 2015-09-26 07:30:51 UTC (1443252651)
[   10.045148] PM: Hibernation image not present or could not be loaded.
[   10.094473] Freeing unused kernel memory: 1408K (ffffffff81d26000 - ffffffff81e86000)
[   10.103740] Write protecting the kernel read-only data: 12288k
[   10.111305] Freeing unused kernel memory: 1308K (ffff8800016b9000 - ffff880001800000)
[   10.121025] Freeing unused kernel memory: 1016K (ffff880001b02000 - ffff880001c00000)
[   10.131421] usb 2-1.4: New USB device found, idVendor=046b, idProduct=ff10
[   10.139390] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   10.148045] usb 2-1.4: Product: Virtual Keyboard and Mouse
[   10.149367] random: systemd urandom read with 17 bits of entropy available
[   10.162425] usb 2-1.4: Manufacturer: American Megatrends Inc.
[   10.162426] usb 2-1.4: SerialNumber: serial
[   10.163721] input: American Megatrends Inc. Virtual Keyboard and Mouse as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/0003:046B:FF10.0001/input/input1
[   10.192154] systemd[1]: systemd 219 running in system mode. (+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN)
[   10.213635] systemd[1]: Detected architecture x86-64.
[   10.214689] hid-generic 0003:046B:FF10.0001: input,hidraw0: USB HID v1.10 Keyboard [American Megatrends Inc. Virtual Keyboard and Mouse] on usb-0000:00:1d.0-1.4/input0
[   10.215524] input: American Megatrends Inc. Virtual Keyboard and Mouse as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.1/0003:046B:FF10.0002/input/input2
[   10.215636] hid-generic 0003:046B:FF10.0002: input,hidraw1: USB HID v1.10 Mouse [American Megatrends Inc. Virtual Keyboard and Mouse] on usb-0000:00:1d.0-1.4/input1
[   10.275787] systemd[1]: Running in initial RAM disk.

Welcome to ^[[0[   10.281666] systemd[1]: No hostname configured.
;34mFedora 22 (T[   10.288576] systemd[1]: Set hostname to <localhost>.
wenty Two) dracu[   10.288589] usb 2-1.8: new full-speed USB device number 4 using ehci-pci
t-041-14.fc22 (I[   10.304729] systemd[1]: Initializing machine ID from random generator.
nitramfs)^[[0m!

[^[[32m  OK  ^[[0m[   10.343927] systemd[1]: Created slice -.slice.
] Created slice [   10.350751] systemd[1]: Starting -.slice.
-.slice.
[   10.356813] systemd[1]: Listening on Journal Socket.
[^[[32m  OK  ^[[0m[   10.363292] systemd[1]: Starting Journal Socket.
] Listening on J[   10.370016] systemd[1]: Listening on udev Kernel Socket.
ournal Socket.
[   10.377478] systemd[1]: Starting udev Kernel Socket.
[^[[32m  OK  ^[[0m[   10.378685] usb 2-1.8: New USB device found, idVendor=9999, idProduct=0120
] Listening on u[   10.378686] usb 2-1.8: New USB device strings: Mfr=1, Product=2, SerialNumber=3
dev Kernel Socke[   10.378687] usb 2-1.8: Product: CAT5 Adapter
t.
[   10.378688] usb 2-1.8: Manufacturer: Generic
[   10.378689] usb 2-1.8: SerialNumber: 000013f221ef
[   10.381118] input: Generic CAT5 Adapter as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8:1.0/0003:9999:0120.0003/input/input3
[   10.431622] hid-generic 0003:9999:0120.0003: input,hidraw2: USB HID v1.00 Keyboard [Generic CAT5 Adapter] on usb-0000:00:1d.0-1.8/input0
[   10.433693] input: Generic CAT5 Adapter as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8:1.1/0003:9999:0120.0004/input/input4
[   10.433808] hid-generic 0003:9999:0120.0004: input,hidraw3: USB HID v1.00 Mouse [Generic CAT5 Adapter] on usb-0000:00:1d.0-1.8/input1
[^[[32m  OK  ^[[0m[   10.476369] systemd[1]: Reached target Swap.
] Reached target[   10.482992] systemd[1]: Starting Swap.
 Swap.
[   10.488807] systemd[1]: Listening on Journal Audit Socket.
[^[[32m  OK  ^[[0m[   10.495646] systemd[1]: Starting Journal Audit Socket.
] Listening on J[   10.503020] systemd[1]: Created slice System Slice.
ournal Audit Soc[   10.509921] systemd[1]: Starting System Slice.
ket.
[^[[32m  OK[   10.516884] systemd[1]: Starting Create list of required static device nodes for the current kernel...
  ^[[0m] Created [   10.528636] systemd[1]: Started Device-Mapper Multipath Device Controller.
slice System Sli[   10.537638] systemd[1]: Reached target Slices.
ce.
         St[   10.544144] systemd[1]: Starting Slices.
arting Create li[   10.550188] systemd[1]: Started Load Kernel Modules.
st of required s[   10.557257] systemd[1]: Listening on Journal Socket (/dev/log).
t... nodes for t[   10.565397] systemd[1]: Starting Journal Socket (/dev/log).
he current kerne[   10.573570] systemd[1]: Starting Journal Service...
l...
[^[[32m  OK[   10.580244] systemd[1]: Reached target Timers.
  ^[[0m] Reached [   10.586751] systemd[1]: Starting Timers.
target Slices.
[   10.592714] systemd[1]: Reached target Local File Systems.
[^[[32m  OK  ^[[0m[   10.600398] systemd[1]: Starting Local File Systems.
] Listening on J[   10.607546] systemd[1]: Started dracut ask for additional cmdline parameters.
ournal Socket (/[   10.617547] systemd[1]: Starting dracut cmdline hook...
dev/log).
     [   10.624508] systemd[1]: Listening on udev Control Socket.
    Starting Jou[   10.632055] systemd[1]: Starting udev Control Socket.
rnal Service...
[   10.639272] systemd[1]: Reached target Sockets.

[^[[32m  OK  ^[[0[   10.645884] systemd[1]: Starting Sockets.
m] Reached targe[   10.652336] systemd[1]: Starting Setup Virtual Console...
t Timers.
[^[[32[   10.660030] systemd[1]: Starting Apply Kernel Variables...
m  OK  ^[[0m] Rea[   10.667255] systemd[1]: Reached target Encrypted Volumes.
ched target Loca[   10.674832] systemd[1]: Starting Encrypted Volumes.
l File Systems.
[   10.682164] systemd[1]: Started Journal Service.

         Starti[   10.688676] audit: type=1130 audit(1443252652.145:2): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-journald comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
ng dracut cmdlin[   10.713544] audit: type=1130 audit(1443252652.170:3): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=kmod-static-nodes comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
e hook...
[^[[32[   10.737867] audit: type=1130 audit(1443252652.194:4): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-vconsole-setup comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
m  OK  ^[[0m] Lis[   10.762713] audit: type=1130 audit(1443252652.219:5): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-sysctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
tening on udev Control Socket.
[^[[32m  OK  ^[[0m] Reached target Sockets.
         Starting Setup Virtual Conso[   10.795752] audit: type=1130 audit(1443252652.252:6): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-tmpfiles-setup-dev comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
le...
         [   10.821978] audit: type=1130 audit(1443252652.278:7): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=dracut-cmdline comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
Starting Apply Kernel Variables...
[^[[32m  OK  ^[[0m] Reached target Encrypted Volumes.
[^[[32m  OK  ^[[0m] Started Journal Service.
[^[[32m  OK  ^[[0m] Started Create list of required sta...ce nodes for the current kernel.
[^[[32m  OK  ^[[0m] Started Setup Virtual Console.
[^[[32m  OK  ^[[0m] Started Apply Kernel Variables.
         Starting Create Static Device Nodes in /dev...
[^[[32m  OK  ^[[0m] Started Create Static Device Nodes in /dev.
[^[[32m  OK  ^[[0m] Started dracut cmdline hook.
         Starting dracut pre-udev hook...
[   10.981844] RPC: Registered named UNIX socket transport module.
[   10.988759] RPC: Registered udp transport module.
[   10.994309] RPC: Registered tcp transport module.
[   10.999854] RPC: Registered tcp NFSv4.1 backchannel transport module.
[^[[32m  OK  ^[[0m[   11.124116] audit: type=1130 audit(1443252652.580:8): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=dracut-pre-udev comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
] Started dracut pre-udev hook.
         Starting udev Kernel Device Manager...
[^[[32m  OK  ^[[0m[   11.159487] audit: type=1130 audit(1443252652.616:9): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-udevd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
] Started udev Kernel Device Manager.
         Starting dracut pre-trigger hook...
[^[[32m  OK  ^[[0m[   11.319703] audit: type=1130 audit(1443252652.776:10): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=dracut-pre-trigger comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=console res=success'
] Started dracut pre-trigger hook.
         Starting udev Coldplug all Devices...
         Mounting Configuration File System...
[^[[32m  OK  ^[[0m] Mounted Configuration File System.
[^[[32m  OK  ^[[0m] Started udev Coldplug all Devices.
         Starting Show Plymouth Boot Screen...
[^[[32m  OK  ^[[0m] Reached target System Initialization.
         Starting dracut initqueue hook...
[^[[32m  OK  ^[[0m] Started dracut initqueue hook.
[^[[32m  OK  ^[[0m] Reached target Remote File Systems (Pre).
[^[[32m  OK  ^[[0m] Reached target Remote File Systems.
         Starting dracut pre-mount hook...
[^[[32m  OK  ^[[0m] Started dracut pre-mount hook.
^[%G[^[[32m  OK  ^[[0m] Found device WDC_WD1002FAEX-00Y9A0 root.
         Starting File System Check on /dev/sda1...
[^[[32m  OK  ^[[0m] Started Show Plymouth Boot Screen.
[^[[32m  OK  ^[[0m] Reached target Paths.
[^[[32m  OK  ^[[0m] Reached target Basic System.
[^[[32m  OK  ^[[0m] Started File System Check on /dev/sda1.
         Mounting /sysroot...
[   11.641197] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[^[[32m  OK  ^[[0m] Mounted /sysroot.
[^[[32m  OK  ^[[0m] Reached target Initrd Root File System.
         Starting Reload Configuration from the Real Root...
[^[[32m  OK  ^[[0m] Started Reload Configuration from the Real Root.
[^[[32m  OK  ^[[0m] Reached target Initrd File Systems.
[^[[32m  OK  ^[[0m] Reached target Initrd Default Target.
         Starting dracut pre-pivot and cleanup hook...
[^[[32m  OK  ^[[0m] Started dracut pre-pivot and cleanup hook.
         Starting Cleaning Up and Shutting Down Daemons...
[^[[32m  OK  ^[[0m] Stopped target Timers.
         Starting Plymouth switch root service...
[^[[32m  OK  ^[[0m] Sto[   11.972329] random: nonblocking pool is initialized
pped Cleaning Up and Shutting Down Daemons.
[^[[32m  OK  ^[[0m] Stopped dracut pre-pivot and cleanup hook.
         Stopping dracut pre-pivot and cleanup hook...
[^[[32m  OK  ^[[0m] Stopped target Remote File Systems.
[^[[32m  OK  ^[[0m] Stopped target Remote File Systems (Pre).
[^[[32m  OK  ^[[0m] Stopped dracut pre-mount hook.
         Stopping dracut pre-mount hook...
[^[[32m  OK  ^[[0m] Stopped dracut initqueue hook.
         Stopping dracut initqueue hook...
[^[[32m  OK  ^[[0m] Stopped target Initrd Default Target.
[^[[32m  OK  ^[[0m] Stopped target Basic System.
[^[[32m  OK  ^[[0m] Stopped target Paths.
[^[[32m  OK  ^[[0m] Stopped target Slices.
[^[[32m  OK  ^[[0m] St[   12.047219] systemd-journald[525]: Received SIGTERM from PID 1 (systemd).
opped target Sockets.
[^[[32m  OK  ^[[0m] Stopped target System Initialization.
[^[[32m  OK  ^[[0m] Stopped target Swap.
[^[[32m  OK  ^[[0m] Stopped target Encrypted Volumes.
[^[[32m  OK  ^[[0m] Stopped udev Coldplug all Devices.
         Stopping udev Coldplug all Devices...
[^[[32m  OK  ^[[0m] Stopped dracut pre-trigger hook.
         Stopping dracut pre-trigger hook...
         Stopping udev Kernel Device Manager...
[^[[32m  OK  ^[[0m] Stopped target Local File Systems.
[^[[32m  OK  ^[[0m] Stopped Apply Kernel Variables.
         Stopping Apply Kernel Variables...
[^[[32m  OK  ^[[0m] Stopped udev Kernel Device Manager.
[^[[32m  OK  ^[[0m] Stopped dracut pre-udev hook.
         Stopping dracut pre-udev hook...
[^[[32m  OK  ^[[0m] Stopped dracut cmdline hook.
         Stopping dracut cmdline hook...
[^[[32m  OK  ^[[0m] Stopped Create Static Device Nodes in /dev.
         Stopping Create Static Device Nodes in /dev...
[^[[32m  OK  ^[[0m] Stopped Create list of required sta...ce nodes for the current kernel.
         Stopping Create list of required st... nodes for the current kernel...
[^[[32m  OK  ^[[0m] Closed udev Control Socket.
[^[[32m  OK  ^[[0m] Closed udev Kernel Socket.
         Starting Cleanup udevd DB...
[^[[32m  OK  ^[[0m] Started Plymouth switch root service.
[^[[32m  OK  ^[[0m] Started Cleanup udevd DB.
[^[[32m  OK  ^[[0m] Reached target Switch Root.
         Starting Switch Root...
[   12.478765] SELinux:  Disabled at runtime.
[   12.483689] SELinux:  Unregistering netfilter hooks

Welcome to ^[[0;34mFedora 22 (Twenty Two)^[[0m!

[^[[32m  OK  ^[[0m] Stopped Switch Root.
[^[[32m  OK  ^[[0m] Stopped target Switch Root.
[^[[32m  OK  ^[[0m] Created slice system-serial\x2dgetty.slice.
[^[[32m  OK  ^[[0m] Listening on Delayed Shutdown Socket.
[^[[32m  OK  ^[[0m] Created slice User and Session Slice.
         Mounting Debug File System...
         Starting Create list of required st... nodes for the current kernel...
[^[[32m  OK  ^[[0m] Reached target Encrypted Volumes.
         Mounting Temporary Directory...
[^[[32m  OK  ^[[0m] Stopped target Initrd File Systems.
         Mounting Huge Pages File System...
[^[[32m  OK  ^[[0m] Reached target Swap.
[^[[32m  OK  ^[[0m] Reached target Paths.
[^[[32m  OK  ^[[0m] Listening on udev Control Socket.
         Mounting POSIX Message Queue File System...
[^[[32m  OK  ^[[0m] Listening on /dev/initctl Compatibility Named Pipe.
[^[[32m  OK  ^[[0m] Reached target Slices.
[^[[32m  OK  ^[[0m] Created slice system-getty.slice.
         Starting Apply Kernel Variables...
[^[[32m  OK  ^[[0m] Stopped Flush Journal to Persistent Storage.
         Starting Remount Root and Kernel File Systems...
[^[[32m  OK  ^[[0m] Stopped Journal Service.
         Starting Journal Service...
[^[[32m  OK  ^[[0m] Stopped target Initrd Root File System.
[^[[32m  OK  ^[[0m] Listening on udev Kernel Socket.
[^[[32m  OK  ^[[0m] Set up automount Arbitrary Executab...ats File System Automount Point.
[^[[32m  OK  ^[[0m] Reached target Remote File Systems.
[^[[1;31mFAILED^[[0m] Failed to start Create list of requ...ce nodes for the current kernel.
See "systemctl status kmod-static-nodes.service" for details.
[^[[32m  OK  ^[[0m] Started Apply Kernel Variables.
[^[[32m  OK  ^[[0m] Started Journal Service.
[^[[32m  OK  ^[[0m] Mounted Huge Pages File System.
[^[[32m  OK  ^[[0m] Mounted POSIX Message Queue File System.
[^[[32m  OK  ^[[0m] Mounted Debug[   13.155218] EXT4-fs (sda1): re-mounted. Opts: (null)
 File System.
[^[[32m  OK  ^[[0m] Mounted Temporary Directory.
[^[[32m  OK  ^[[0m] Started Remount Root and Kernel File Systems.
         Starting udev Coldplug all Devices...
         Starting Flush Journal to Persistent Storage...
         Starting Create Static Device Nodes in /dev...
         Starting Configure read-only root support...
[   13.205098] systemd-journald[964]: Received request to flush runtime journal from PID 1
[^[[32m  OK  ^[[0m] Started udev Coldplug all Devices.
[^[[32m  OK  ^[[0m[   13.548777] audit_printk_skb: 144 callbacks suppressed
] Started Create[   13.548779] audit: type=1130 audit(1443252655.006:59): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-setup-dev comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
 Static Device Nodes in /dev.
         Starting udev Kernel Device Manager...
[^[[32m  OK  ^[[0m] Reached target Local File Systems (Pre).
[^[[32m  OK  ^[[0m[   13.734632] audit: type=1130 audit(1443252655.192:60): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=fedora-readonly comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
] Started Configure read-only root support.
         Starting Load/Save Random Seed...
[^[[32m  OK  ^[[0m] Reached target Local File Systems.
         Starting Import network configuration from initramfs...
         Starting Tell Plymouth To Write Out Runtime Data...
         Starting Restore /run/initramfs on shutdown...
[^[[32m  OK  ^[[0m] Started Load/Save Random Seed.
[   13.853118] audit: type=1130 audit(1443252655.311:61): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-random-seed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[^[[32m  OK  ^[[0m] Started Restore /run/initramfs on shutdown.
[   13.885078] audit: type=1130 audit(1443252655.343:62): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=dracut-shutdown comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[^[[32m  OK  ^[[0m] Started Tell Plymouth To Write Out Runtime Data.
[   13.949065] audit: type=1130 audit(1443252655.407:63): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=plymouth-read-write comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[   13.971203] audit: type=1131 audit(1443252655.429:64): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=plymouth-read-write comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[^[[32m  OK  ^[[0m] Started Import network configuration from initramfs.
[   14.003008] audit: type=1130 audit(1443252655.461:65): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=fedora-import-state comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[^[[32m  OK  ^[[0m] Started udev Kernel Device Manager.
[   14.687731] audit: type=1130 audit(1443252656.146:66): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-udevd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[^[[32m  OK  ^[[0m] Found device /dev/ttyS0.
^[%G[^[[32m  OK  ^[[0m] Started Flush Journal to Persistent Storage.
[   16.421912] audit: type=1130 audit(1443252657.881:67): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-journal-flush comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
         Starting Create Volatile Files and Directories...
[^[[32m  OK  ^[[0m[   16.514203] audit: type=1130 audit(1443252657.973:68): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-setup comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
] Started Create Volatile Files and Directories.
         Starting Security Auditing Service...
[^[[32m  OK  ^[[0m] Started Security Auditing Service.
         Starting Update UTMP about System Boot/Shutdown...
[^[[32m  OK  ^[[0m] Started Update UTMP about System Boot/Shutdown.
[^[[32m  OK  ^[[0m] Reached target System Initialization.
[^[[32m  OK  ^[[0m] Listening on D-Bus System Message Bus Socket.
[^[[32m  OK  ^[[0m] Reached target Sockets.
[^[[32m  OK  ^[[0m] Reached target Basic System.
         Starting Network Manager...
         Starting Login Service...
         Starting Machine Check Exception Logging Daemon...
[^[[32m  OK  ^[[0m] Started D-Bus System Message Bus.
         Starting D-Bus System Message Bus...
         Starting Permit User Sessions...
[^[[32m  OK  ^[[0m] Reached target Timers.
[^[[32m  OK  ^[[0m] Started Machine Check Exception Logging Daemon.
[^[[32m  OK  ^[[0m] Started Login Service.
[^[[32m  OK  ^[[0m] Started Permit User Sessions.
         Starting Terminate Plymouth Boot Screen...
[^[[32m  OK  ^[[0m] Started Command Scheduler.
         Starting Command Scheduler...
         Starting Wait for Plymouth Boot Screen to Quit...

Fedora release 22 (Twenty Two)
Kernel 4.3.0-rc2+ on an x86_64 (ttyS0)

#
# Artem:
# The machine is booted up, but it is not available over network, because the
# network module cannot be loaded, due to corruptions. Well, many modules can't
# be loaded, may be even all of them are corrupted.
#
ivbep0 login: root
Password: 
Last login: Sat Sep 26 02:31:50 from 192.168.100.1
[root@ivbep0 ~]# modprobe xfs
modprobe: ERROR: magic check fail: 0 instead of b007f457
[root@ivbep0 ~]# hexdump /usr/lib/modules/4.3.0-rc2+/kernel/fs/xfs/xfs.ko 
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
17adc90 0000 0000 0000 0000 0000 0000 0000     
17adc9e
[root@ivbep0 ~]# hexdump /usr/lib/modules/4.3.0-rc2+/kernel/fs/xfs/xfs.ko
/usr/lib/modules/4.3.0-rc2+/kernel/fs/xfs/xfs.ko: data
[root@ivbep0 ~]# 

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

Hello, Artem.

Thanks a lot for the debug dump.  Can you please test whether the
below patch fixes the issue?

Index: work/mm/page-writeback.c
===================================================================
--- work.orig/mm/page-writeback.c
+++ work/mm/page-writeback.c
@@ -1956,7 +1956,6 @@ void laptop_mode_timer_fn(unsigned long
 	int nr_pages = global_page_state(NR_FILE_DIRTY) +
 		global_page_state(NR_UNSTABLE_NFS);
 	struct bdi_writeback *wb;
-	struct wb_iter iter;
 
 	/*
 	 * We want to write everything out, not just down to the dirty
@@ -1965,10 +1964,12 @@ void laptop_mode_timer_fn(unsigned long
 	if (!bdi_has_dirty_io(&q->backing_dev_info))
 		return;
 
-	bdi_for_each_wb(wb, &q->backing_dev_info, &iter, 0)
+	rcu_read_lock();
+	list_for_each_entry_rcu(wb, &q->backing_dev_info.wb_list, bdi_node)
 		if (wb_has_dirty_io(wb))
 			wb_start_writeback(wb, nr_pages, true,
 					   WB_REASON_LAPTOP_TIMER);
+	rcu_read_unlock();
 }
 
 /*
Index: work/fs/fs-writeback.c
===================================================================
--- work.orig/fs/fs-writeback.c
+++ work/fs/fs-writeback.c
@@ -778,19 +778,24 @@ static void bdi_split_work_to_wbs(struct
 				  struct wb_writeback_work *base_work,
 				  bool skip_if_busy)
 {
-	int next_memcg_id = 0;
-	struct bdi_writeback *wb;
-	struct wb_iter iter;
+	struct bdi_writeback *last_wb = NULL;
+	struct bdi_writeback *wb = list_entry_rcu(&bdi->wb_list,
+						struct bdi_writeback, bdi_node);
 
 	might_sleep();
 restart:
 	rcu_read_lock();
-	bdi_for_each_wb(wb, bdi, &iter, next_memcg_id) {
+	list_for_each_entry_continue_rcu(wb, &bdi->wb_list, bdi_node) {
 		DEFINE_WB_COMPLETION_ONSTACK(fallback_work_done);
 		struct wb_writeback_work fallback_work;
 		struct wb_writeback_work *work;
 		long nr_pages;
 
+		if (last_wb) {
+			wb_put(last_wb);
+			last_wb = NULL;
+		}
+
 		/* SYNC_ALL writes out I_DIRTY_TIME too */
 		if (!wb_has_dirty_io(wb) &&
 		    (base_work->sync_mode == WB_SYNC_NONE ||
@@ -819,7 +824,14 @@ restart:
 
 		wb_queue_work(wb, work);
 
-		next_memcg_id = wb->memcg_css->id + 1;
+		/*
+		 * Pin @wb so that it stays on @bdi->wb_list.  This allows
+		 * continuing iteration from @wb after dropping regrabbing
+		 * rcu read lock.
+		 */
+		wb_get(wb);
+		last_wb = wb;
+
 		rcu_read_unlock();
 		wb_wait_for_completion(bdi, &fallback_work_done);
 		goto restart;
@@ -1857,12 +1869,11 @@ void wakeup_flusher_threads(long nr_page
 	rcu_read_lock();
 	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
 		struct bdi_writeback *wb;
-		struct wb_iter iter;
 
 		if (!bdi_has_dirty_io(bdi))
 			continue;
 
-		bdi_for_each_wb(wb, bdi, &iter, 0)
+		list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)
 			wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),
 					   false, reason);
 	}
@@ -1894,11 +1905,10 @@ static void wakeup_dirtytime_writeback(s
 	rcu_read_lock();
 	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {
 		struct bdi_writeback *wb;
-		struct wb_iter iter;
 
-		bdi_for_each_wb(wb, bdi, &iter, 0)
-			if (!list_empty(&bdi->wb.b_dirty_time))
-				wb_wakeup(&bdi->wb);
+		list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)
+			if (!list_empty(&wb->b_dirty_time))
+				wb_wakeup(wb);
 	}
 	rcu_read_unlock();
 	schedule_delayed_work(&dirtytime_work, dirtytime_expire_interval * HZ);
Index: work/include/linux/backing-dev-defs.h
===================================================================
--- work.orig/include/linux/backing-dev-defs.h
+++ work/include/linux/backing-dev-defs.h
@@ -116,6 +116,8 @@ struct bdi_writeback {
 	struct list_head work_list;
 	struct delayed_work dwork;	/* work item used for writeback */
 
+	struct list_head bdi_node;	/* anchored at bdi->wb_list */
+
 #ifdef CONFIG_CGROUP_WRITEBACK
 	struct percpu_ref refcnt;	/* used only for !root wb's */
 	struct fprop_local_percpu memcg_completions;
@@ -150,6 +152,7 @@ struct backing_dev_info {
 	atomic_long_t tot_write_bandwidth;
 
 	struct bdi_writeback wb;  /* the root writeback info for this bdi */
+	struct list_head wb_list; /* list of all wbs */
 #ifdef CONFIG_CGROUP_WRITEBACK
 	struct radix_tree_root cgwb_tree; /* radix tree of active cgroup wbs */
 	struct rb_root cgwb_congested_tree; /* their congested states */
Index: work/include/linux/backing-dev.h
===================================================================
--- work.orig/include/linux/backing-dev.h
+++ work/include/linux/backing-dev.h
@@ -401,61 +401,6 @@ static inline void unlocked_inode_to_wb_
 	rcu_read_unlock();
 }
 
-struct wb_iter {
-	int			start_memcg_id;
-	struct radix_tree_iter	tree_iter;
-	void			**slot;
-};
-
-static inline struct bdi_writeback *__wb_iter_next(struct wb_iter *iter,
-						   struct backing_dev_info *bdi)
-{
-	struct radix_tree_iter *titer = &iter->tree_iter;
-
-	WARN_ON_ONCE(!rcu_read_lock_held());
-
-	if (iter->start_memcg_id >= 0) {
-		iter->slot = radix_tree_iter_init(titer, iter->start_memcg_id);
-		iter->start_memcg_id = -1;
-	} else {
-		iter->slot = radix_tree_next_slot(iter->slot, titer, 0);
-	}
-
-	if (!iter->slot)
-		iter->slot = radix_tree_next_chunk(&bdi->cgwb_tree, titer, 0);
-	if (iter->slot)
-		return *iter->slot;
-	return NULL;
-}
-
-static inline struct bdi_writeback *__wb_iter_init(struct wb_iter *iter,
-						   struct backing_dev_info *bdi,
-						   int start_memcg_id)
-{
-	iter->start_memcg_id = start_memcg_id;
-
-	if (start_memcg_id)
-		return __wb_iter_next(iter, bdi);
-	else
-		return &bdi->wb;
-}
-
-/**
- * bdi_for_each_wb - walk all wb's of a bdi in ascending memcg ID order
- * @wb_cur: cursor struct bdi_writeback pointer
- * @bdi: bdi to walk wb's of
- * @iter: pointer to struct wb_iter to be used as iteration buffer
- * @start_memcg_id: memcg ID to start iteration from
- *
- * Iterate @wb_cur through the wb's (bdi_writeback's) of @bdi in ascending
- * memcg ID order starting from @start_memcg_id.  @iter is struct wb_iter
- * to be used as temp storage during iteration.  rcu_read_lock() must be
- * held throughout iteration.
- */
-#define bdi_for_each_wb(wb_cur, bdi, iter, start_memcg_id)		\
-	for ((wb_cur) = __wb_iter_init(iter, bdi, start_memcg_id);	\
-	     (wb_cur); (wb_cur) = __wb_iter_next(iter, bdi))
-
 #else	/* CONFIG_CGROUP_WRITEBACK */
 
 static inline bool inode_cgwb_enabled(struct inode *inode)
@@ -515,14 +460,6 @@ static inline void wb_blkcg_offline(stru
 {
 }
 
-struct wb_iter {
-	int		next_id;
-};
-
-#define bdi_for_each_wb(wb_cur, bdi, iter, start_blkcg_id)		\
-	for ((iter)->next_id = (start_blkcg_id);			\
-	     ({	(wb_cur) = !(iter)->next_id++ ? &(bdi)->wb : NULL; }); )
-
 static inline int inode_congested(struct inode *inode, int cong_bits)
 {
 	return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);
Index: work/mm/backing-dev.c
===================================================================
--- work.orig/mm/backing-dev.c
+++ work/mm/backing-dev.c
@@ -480,6 +480,10 @@ static void cgwb_release_workfn(struct w
 						release_work);
 	struct backing_dev_info *bdi = wb->bdi;
 
+	spin_lock_irq(&cgwb_lock);
+	list_del_rcu(&wb->bdi_node);
+	spin_unlock_irq(&cgwb_lock);
+
 	wb_shutdown(wb);
 
 	css_put(wb->memcg_css);
@@ -575,6 +579,7 @@ static int cgwb_create(struct backing_de
 		ret = radix_tree_insert(&bdi->cgwb_tree, memcg_css->id, wb);
 		if (!ret) {
 			atomic_inc(&bdi->usage_cnt);
+			list_add_tail_rcu(&wb->bdi_node, &bdi->wb_list);
 			list_add(&wb->memcg_node, memcg_cgwb_list);
 			list_add(&wb->blkcg_node, blkcg_cgwb_list);
 			css_get(memcg_css);
@@ -669,6 +674,7 @@ static int cgwb_bdi_init(struct backing_
 	if (!ret) {
 		bdi->wb.memcg_css = mem_cgroup_root_css;
 		bdi->wb.blkcg_css = blkcg_root_css;
+		list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);
 	}
 	return ret;
 }
@@ -686,6 +692,9 @@ static void cgwb_bdi_destroy(struct back
 	radix_tree_for_each_slot(slot, &bdi->cgwb_tree, &iter, 0)
 		cgwb_kill(*slot);
 
+	/* release of wb's may happen after @bdi is freed, sever list head */
+	list_del(&bdi->wb_list);
+
 	rbtree_postorder_for_each_entry_safe(congested, congested_n,
 					&bdi->cgwb_congested_tree, rb_node) {
 		rb_erase(&congested->rb_node, &bdi->cgwb_congested_tree);
@@ -755,6 +764,9 @@ static int cgwb_bdi_init(struct backing_
 		kfree(bdi->wb_congested);
 		return err;
 	}
+
+	list_add_tail_rcu(&bdi->wb.bdi_node, &bdi->wb_list);
+
 	return 0;
 }
 
@@ -770,6 +782,7 @@ int bdi_init(struct backing_dev_info *bd
 	bdi->max_ratio = 100;
 	bdi->max_prop_frac = FPROP_FRAC_BASE;
 	INIT_LIST_HEAD(&bdi->bdi_list);
+	INIT_LIST_HEAD(&bdi->wb_list);
 	init_waitqueue_head(&bdi->wb_waitq);
 
 	return cgwb_bdi_init(bdi);

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Artem Bityutskiy]

On Sat, 2015-09-26 at 18:14 -0400, Tejun Heo wrote:
> Hello, Artem.
> 
> Thanks a lot for the debug dump.  Can you please test whether the
> below patch fixes the issue?

Hi,

I've tested this, 7 out of 7 reboots successful, so it looks like this
patch fixes the problem.

Artem.

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

Hello, Artem.

On Tue, Sep 29, 2015 at 02:37:36PM +0300, Artem Bityutskiy wrote:
> On Sat, 2015-09-26 at 18:14 -0400, Tejun Heo wrote:
> > Hello, Artem.
> > 
> > Thanks a lot for the debug dump.  Can you please test whether the
> > below patch fixes the issue?
> 
> Hi,
> 
> I've tested this, 7 out of 7 reboots successful, so it looks like this
> patch fixes the problem.

Thanks a lot for testing.  Will soon post the split patches w/ your
tested-by.

-- 
tejun

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Jens Axboe]

On 09/23/2015 03:07 PM, Tejun Heo wrote:
> inode_cgwb_enabled() gates cgroup writeback support.  If it returns
> true, each inode is attached to the corresponding memory domain which
> gets mapped to io domain.  It currently only tests whether the
> filesystem and bdi support cgroup writeback; however, cgroup writeback
> support doesn't work on traditional hierarchies and thus it should
> also test whether memcg and iocg are on the default hierarchy.
>
> This caused traditional hierarchy setups to hit the cgroup writeback
> path inadvertently and ended up creating separate writeback domains
> for each memcg and mapping them all to the root iocg uncovering a
> couple issues in the cgroup writeback path.
>
> cgroup writeback was never meant to be enabled on traditional
> hierarchies.  Make inode_cgwb_enabled() test whether both memcg and
> iocg are on the default hierarchy.
>
> Signed-off-by: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Reported-by: Artem Bityutskiy <dedekind1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Reported-by: Dexuan Cui <decui-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>
> Link: http://lkml.kernel.org/g/1443012552.19983.209.camel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
> Link: http://lkml.kernel.org/g/f30d4a6aa8a546ff88f73021d026a453-NHRYisGuqk8ni+flWUsx/pbBmlrREI7+ECdVDZe1NQc@public.gmane.org
> ---
> Hello,
>
> So, this should make the regression go away.  It doesn't fix the
> underlying bugs but they shouldn't get triggered by people not
> experimenting with cgroup.
>
> I'm gonna keep digging the underlying issues but this should make the
> regressions go away.  If it's okay, I think it'd be better to route
> this through cgroup/for-4.3-fixes as it's gonna cause a conflict with
> for-4.4 branch and handling the merge there is easier.
>
> Thanks.
>
>   include/linux/backing-dev.h |   11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)

I'll ack this since it works around both the corruption issue and the 
performance regression, so we can avoid having to revert parts of this. 
And I know you'll keep hunting and get the real issue fixed in the mean 
time.

Acked-by: Jens Axboe <axboe-b10kYP2dOMg@public.gmane.org>

-- 
Jens Axboe

Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies

[Tejun Heo]

On Wed, Sep 23, 2015 at 05:07:29PM -0400, Tejun Heo wrote:
> inode_cgwb_enabled() gates cgroup writeback support.  If it returns
> true, each inode is attached to the corresponding memory domain which
> gets mapped to io domain.  It currently only tests whether the
> filesystem and bdi support cgroup writeback; however, cgroup writeback
> support doesn't work on traditional hierarchies and thus it should
> also test whether memcg and iocg are on the default hierarchy.
> 
> This caused traditional hierarchy setups to hit the cgroup writeback
> path inadvertently and ended up creating separate writeback domains
> for each memcg and mapping them all to the root iocg uncovering a
> couple issues in the cgroup writeback path.
> 
> cgroup writeback was never meant to be enabled on traditional
> hierarchies.  Make inode_cgwb_enabled() test whether both memcg and
> iocg are on the default hierarchy.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reported-by: Artem Bityutskiy <dedekind1@gmail.com>
> Reported-by: Dexuan Cui <decui@microsoft.com>
> Link: http://lkml.kernel.org/g/1443012552.19983.209.camel@gmail.com
> Link: http://lkml.kernel.org/g/f30d4a6aa8a546ff88f73021d026a453@SIXPR30MB031.064d.mgd.msft.net

Applying to cgroup/for-4.3-fixes.

Thanks.

-- 
tejun

Re: [PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Tejun Heo]

Hello,

On Tue, Jun 16, 2015 at 06:53:11PM -0400, Tejun Heo wrote:
> This is v2.  The only change from the last take[L] is
> 
> * Updated to reflect the earlier MS_CGROUPWB -> SB_I_CGROUPWB change.
> 
> This patchset implements cgroup writeback support for ext4, which is
> enabled for writeback and ordered data modes.  This patchset contains
> the following two patches.

Ted, these two patches apply cleanly on top of the current mainline
and thus can be routed either through ext4 or block tree.  What do you
think?

Thanks.

-- 
tejun

Re: [PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Tejun Heo]

On Sun, Jul 12, 2015 at 02:05:20PM -0400, Tejun Heo wrote:
> Ted, these two patches apply cleanly on top of the current mainline
> and thus can be routed either through ext4 or block tree.  What do you
> think?

ping?

Thanks.

-- 
tejun

Re: [PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Dave Chinner]

On Thu, Jul 16, 2015 at 03:40:58PM -0400, Tejun Heo wrote:
> On Sun, Jul 12, 2015 at 02:05:20PM -0400, Tejun Heo wrote:
> > Ted, these two patches apply cleanly on top of the current mainline
> > and thus can be routed either through ext4 or block tree.  What do you
> > think?
> 
> ping?

Tejun, is this all that needs to be done to support cgroup aware
writeback in a filesystem (i.e. wbc_init_bio, wbc_account_io in the
writepage path, superblock flag)?

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Tejun Heo]

Hello, Dave.

On Fri, Jul 17, 2015 at 09:21:59AM +1000, Dave Chinner wrote:
> Tejun, is this all that needs to be done to support cgroup aware
> writeback in a filesystem (i.e. wbc_init_bio, wbc_account_io in the
> writepage path, superblock flag)?

Yes, this is about it.  It gets slightly more complex if bio's are
bounced to another task as they would need to be associated with the
current cgroup.

The following is from Documentation/cgroups/blkio-controller.txt

Filesystem support for cgroup writeback
---------------------------------------

A filesystem can make writeback IOs cgroup-aware by updating
address_space_operations->writepage[s]() to annotate bio's using the
following two functions.

* wbc_init_bio(@wbc, @bio)

  Should be called for each bio carrying writeback data and associates
  the bio with the inode's owner cgroup.  Can be called anytime
  between bio allocation and submission.

* wbc_account_io(@wbc, @page, @bytes)

  Should be called for each data segment being written out.  While
  this function doesn't care exactly when it's called during the
  writeback session, it's the easiest and most natural to call it as
  data segments are added to a bio.

With writeback bio's annotated, cgroup support can be enabled per
super_block by setting MS_CGROUPWB in ->s_flags.  This allows for
selective disabling of cgroup writeback support which is helpful when
certain filesystem features, e.g. journaled data mode, are
incompatible.

wbc_init_bio() binds the specified bio to its cgroup.  Depending on
the configuration, the bio may be executed at a lower priority and if
the writeback session is holding shared resources, e.g. a journal
entry, may lead to priority inversion.  There is no one easy solution
for the problem.  Filesystems can try to work around specific problem
cases by skipping wbc_init_bio() or using bio_associate_blkcg()
directly.

Thanks.

-- 
tejun

Re: [PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Theodore Ts'o]

On Sun, Jul 12, 2015 at 02:05:20PM -0400, Tejun Heo wrote:
> Hello,
> 
> On Tue, Jun 16, 2015 at 06:53:11PM -0400, Tejun Heo wrote:
> > This is v2.  The only change from the last take[L] is
> > 
> > * Updated to reflect the earlier MS_CGROUPWB -> SB_I_CGROUPWB change.
> > 
> > This patchset implements cgroup writeback support for ext4, which is
> > enabled for writeback and ordered data modes.  This patchset contains
> > the following two patches.
> 
> Ted, these two patches apply cleanly on top of the current mainline
> and thus can be routed either through ext4 or block tree.  What do you
> think?

I'll take them through the ext4 tree.

						- Ted

Re: [PATCHSET v2 block/for-4.2/writeback] ext4: implement cgroup writeback support

[Tejun Heo]

On Thu, Jul 16, 2015 at 09:37:31PM -0400, Theodore Ts'o wrote:
> I'll take them through the ext4 tree.

Great, thanks!

-- 
tejun