unable to handle paging request at resume (was: Re: [TuxOnIce-devel] Nigel's current for-rafael queue)

[Martin Steigerwald <Martin@lichtvoll.de>]

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Hi Nigel and Rafael,

Am Dienstag 28 September 2010 schrieb Martin Steigerwald:
> Am Samstag 25 September 2010 schrieb Nigel Cunningham:
> > Hi Rafael.
> > 
> > Please find attached a slightly updated version of the patchset I
> > sent a few months ago. The main change is that I've prepended and
> > additional patch which lets the user see the speed at which the
> > image is being read and written. This is accomplished by recording
> > the MB/s in a single byte in the image header, and using a couple of
> > __nosavedata variables to get the data back through the atomic
> > restore. I realise the char limits us to 255MB/s at the moment. In
> > future patches, I intend to address this by storing the data in a
> > 'proper' image header (it's a real problem - TuxOnIce reads and
> > writes on the same set up at speeds around 250MB/s).
> > 
> > Results on my Dell XPS M1530, which has an SSD hard drive are:
> > 
> > With just patch 1 applied:
> > Attempt 1: Write 74MB/s; Read 52MB/s
> > Attempt 2: Write 68MB/s; Read 52MB/s
> > Attempt 3: Write 73MB/s; Read 53MB/s
> > 
> > With the whole sequence:
> > Attempt 1: Write 181MB/s; Read 52MB/s
> > Attempt 2: Write 156MB/s; Read 53MB/s
> > Attempt 3: Write 160MB/s; Read 52MB/s
> 
> Is doesn't get much stabler than
> 
> shambhala:~> grep "PM: Image.*at " /var/log/syslog
> Sep 28 11:32:06 shambhala kernel: PM: Image written at 63 MB/s.
> Sep 28 11:32:06 shambhala kernel: PM: Image read at 32 MB/s.
> Sep 28 11:35:00 shambhala kernel: PM: Image written at 65 MB/s.
> Sep 28 11:35:00 shambhala kernel: PM: Image read at 32 MB/s.
> Sep 28 11:38:43 shambhala kernel: PM: Image written at 65 MB/s.
> Sep 28 11:38:43 shambhala kernel: PM: Image read at 33 MB/s.
> Sep 28 11:41:15 shambhala kernel: PM: Image written at 66 MB/s.
> Sep 28 11:41:15 shambhala kernel: PM: Image read at 33 MB/s.
> Sep 28 11:42:57 shambhala kernel: PM: Image written at 66 MB/s.
> Sep 28 11:42:57 shambhala kernel: PM: Image read at 34 MB/s.
> Sep 28 11:45:16 shambhala kernel: PM: Image written at 66 MB/s.
> Sep 28 11:45:16 shambhala kernel: PM: Image read at 34 MB/s.
> Sep 28 12:19:21 shambhala kernel: PM: Image written at 66 MB/s.
> Sep 28 12:19:21 shambhala kernel: PM: Image read at 35 MB/s.
> Sep 28 12:21:35 shambhala kernel: PM: Image written at 65 MB/s.
> Sep 28 12:21:35 shambhala kernel: PM: Image read at 35 MB/s.
> Sep 28 12:23:18 shambhala kernel: PM: Image written at 65 MB/s.
> Sep 28 12:23:18 shambhala kernel: PM: Image read at 35 MB/s.
> Sep 28 12:25:23 shambhala kernel: PM: Image written at 64 MB/s.
> Sep 28 12:25:23 shambhala kernel: PM: Image read at 36 MB/s.
> Sep 28 12:26:55 shambhala kernel: PM: Image written at 65 MB/s.
> Sep 28 12:26:55 shambhala kernel: PM: Image read at 37 MB/s.
> Sep 28 12:28:28 shambhala kernel: PM: Image written at 65 MB/s.
> Sep 28 12:28:28 shambhala kernel: PM: Image read at 37 MB/s.
> 
> many attempts.
> 
> So - without readahead patch for now -
> 
> Tested-By: Martin Steigerwald <Martin@Lichtvoll.de>
> 
> on 2.6.36-rc5.

Well probably it couldn't get more stable than that, but it was able to 
get more unstable:

This morning I got a unable to handle paging request after switching on my 
kernel suspended ThinkPad T42. With exactly that kernel with all of 
Nigel's patches except for the readahead one.

http://martin-steigerwald.de/tmp/suspend-patches/unable-to-handle-paging-
request-at-resume/

IMG_3897.JPG  is what I saw first. IMG_3900.JPG came after I pressed the 
power button to swich off the machine in order to cold reboot it. As I left 
the machine unattended during resume, I did not see what happened before 
this.

On the next attempt the laptop just rebootet instead of trying to resume 
from the saved image again.

I grepped stuff in syslog and found that it seemed to have been able to 
write some stuff into syslog prior to the trace:

Sep 30 00:00:34 shambhala kernel: PM: Marking nosave pages: 
000000000009f000 - 0000000000100000
Sep 30 00:00:34 shambhala kernel: PM: Basic memory bitmaps created
Sep 30 00:00:34 shambhala kernel: PM: Syncing filesystems ... done.
Sep 30 09:13:34 shambhala kernel: Freezing user space processes ... 
00:02:00.0: restoring config space at offset
 0x1 (was 0x2100107, writing 0x2100007)
Sep 30 09:13:34 shambhala kernel: yenta_cardbus 0000:02:00.1: restoring 
config space at offset 0xf (was 0x3c0020
b, writing 0x5c0020b)
Sep 30 09:13:34 shambhala kernel: yenta_cardbus 0000:02:00.1: restoring 
config space at offset 0x3 (was 0x824008
, writing 0x82a810)
Sep 30 09:13:34 shambhala kernel: yenta_cardbus 0000:02:00.1: restoring 
config space at offset 0x1 (was 0x210010
7, writing 0x2100007)
Sep 30 09:13:34 shambhala kernel: e1000 0000:02:01.0: BAR 0: set to [mem 
0xc0220000-0xc023ffff] (PCI address [0x
c0220000-0xc023ffff]
Sep 30 09:13:34 shambhala kernel: e1000 0000:02:01.0: BAR 1: set to [mem 
0xc0200000-0xc020ffff] (PCI address [0x
c0200000-0xc020ffff]
Sep 30 09:13:34 shambhala kernel: e1000 0000:02:01.0: BAR 2: set to [io  
0x8000-0x803f] (PCI address [0x8000-0x8
03f]
Sep 30 09:13:34 shambhala kernel: e1000 0000:02:01.0: restoring config 
space at offset 0xf (was 0xff0100, writin
g 0xff010b)
Sep 30 09:13:34 shambhala kernel: e1000 0000:02:01.0: restoring config 
space at offset 0x3 (was 0x0, writing 0x4
008)
Sep 30 09:13:34 shambhala kernel: e1000 0000:02:01.0: restoring config 
space at offset 0x1 (was 0x2300000, writi
ng 0x2300117)
Sep 30 09:13:34 shambhala kernel: PM: early restore of devices complete 
after 31.408 msecs
Sep 30 09:13:34 shambhala kernel: BUG: Bad page state in process echo  
pfn:73302
Sep 30 09:13:34 shambhala kernel: page:c24d8040 count:0 mapcount:1 
mapping:(null) index:0x9bf5
Sep 30 09:13:34 shambhala kernel: page flags: 0x80100078(uptodate|dirty|
lru|active|swapbacked)
Sep 30 09:13:34 shambhala kernel: Pid: 18599, comm: echo Not tainted 
2.6.36-rc5-tp42-hiber-wri-accel-vmembase-0-
00133-g3394a84-dirty #1
Sep 30 09:13:34 shambhala kernel: Call Trace:
Sep 30 09:13:34 shambhala kernel: [<c10ac8d3>] bad_page+0x83/0xd0
Sep 30 09:13:34 shambhala kernel: [<c10ad541>] 
free_pages_prepare+0x131/0x170
Sep 30 09:13:34 shambhala kernel: [<c10aef98>] 
free_hot_cold_page+0x28/0x140
Sep 30 09:13:34 shambhala kernel: [<c10af0e5>] __free_pages+0x35/0x40
Sep 30 09:13:34 shambhala kernel: [<c10727e6>] swsusp_free+0xa6/0x100
Sep 30 09:13:34 shambhala kernel: [<c10719f3>] 
hibernation_snapshot+0x123/0x290
Sep 30 09:13:34 shambhala kernel: [<c1070b76>] ? 
freeze_processes+0x56/0xa0
Sep 30 09:13:34 shambhala kernel: [<c1071c45>] hibernate+0xe5/0x210
Sep 30 09:13:34 shambhala kernel: [<c10704f0>] ? state_store+0x0/0xb0
Sep 30 09:13:34 shambhala kernel: [<c1070596>] state_store+0xa6/0xb0
Sep 30 09:13:34 shambhala kernSep 30 09:25:08 shambhala kernel: imklog 
4.6.4, log source = /proc/kmsg started.

Maybe this is a 2.6.36-rc5 bug instead of a bug in your patches, I can't 
tell.

Hope this helps. Topmost priority has finally finishing my tax returns for 
now, so I don't like to invest much time into it in the next two days.

After that I might try a new kernel, so if you have any suggestions on 
what to try, feel free to share them with me.

Please tell me when you like to have this reported into 
bugzilla.kernel.org! I'd prefer to report stuff there, instead of storing 
attachment on a temporary location onto my server.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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