My Kernel bug is celebrating 2 years. Can you help me fix it?

My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Senna Tschudin]

I have reported a bug more than two years ago and it is still
affecting me. The bug report gives some information:

https://bugzilla.redhat.com/show_bug.cgi?id=787299

I have tried basic debug instructions from:
https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt

And everything works as expected when:
# echo freeze > /sys/power/state
# echo disk > /sys/power/state

I have asked for help for fixing it:
https://lkml.org/lkml/2013/11/1/186

But I don't have a serial port. How can I debug this issue without a
"real" serial port? Or what else can I try? How can I explore the hint
about the problem only happening with VT-d enabled in BIOS? How can I
explore the hint about the problem not happening if the option
nox2apic is passed to the Kernel?

Thank you,

Peter

P.S Yes, it works on Windows.

-- 
Peter

My Kernel bug is celebrating 2 years. Can you help me fix it?

[walter harms]

Am 04.03.2014 22:26, schrieb Peter Senna Tschudin:
> I have reported a bug more than two years ago and it is still
> affecting me. The bug report gives some information:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=787299
> 
> I have tried basic debug instructions from:
> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
> 
> And everything works as expected when:
> # echo freeze > /sys/power/state
> # echo disk > /sys/power/state
> 
> I have asked for help for fixing it:
> https://lkml.org/lkml/2013/11/1/186
> 
> But I don't have a serial port. How can I debug this issue without a
> "real" serial port? Or what else can I try? 
You need to create a kernel with networksupport,
setup "netconsole" you need a second computer to receive the issues.


>How can I explore the hint
> about the problem only happening with VT-d enabled in BIOS? How can I
> explore the hint about the problem not happening if the option
> nox2apic is passed to the Kernel?

never heard about that until now, obviously there is a bug in several
acpi's that can be triggered. If your systems works with nox2apic
as bootparameter you should be happy since a workaround is available.
Information about it is used can be find here:
http://lxr.free-electrons.com/ident?a=microblaze;i=nox2apic

re,
 wh


> Thank you,
> 
> Peter
> 
> P.S Yes, it works on Windows.
> 

My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Senna Tschudin]

On Mar 5, 2014 9:27 AM, "walter harms" <wharms@bfs.de> wrote:
>
>
>
> Am 04.03.2014 22:26, schrieb Peter Senna Tschudin:
> > I have reported a bug more than two years ago and it is still
> > affecting me. The bug report gives some information:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=787299
> >
> > I have tried basic debug instructions from:
> > https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
> >
> > And everything works as expected when:
> > # echo freeze > /sys/power/state
> > # echo disk > /sys/power/state
> >
> > I have asked for help for fixing it:
> > https://lkml.org/lkml/2013/11/1/186
> >
> > But I don't have a serial port. How can I debug this issue without a
> > "real" serial port? Or what else can I try?
> You need to create a kernel with networksupport,
> setup "netconsole" you need a second computer to receive the issues.

I have tried, and it does not work. The kernel do not start running
properly after resume, so there is no network...

>
>
> >How can I explore the hint
> > about the problem only happening with VT-d enabled in BIOS? How can I
> > explore the hint about the problem not happening if the option
> > nox2apic is passed to the Kernel?
>
> never heard about that until now, obviously there is a bug in several
> acpi's that can be triggered. If your systems works with nox2apic
> as bootparameter you should be happy since a workaround is available.
> Information about it is used can be find here:
> http://lxr.free-electrons.com/ident?a=microblaze;i=nox2apic

Sorry, I'm not happy with the workaround, I want it to work. Thank you for
the link, I'll check it.

>
> re,
>  wh
>
>
> > Thank you,
> >
> > Peter
> >
> > P.S Yes, it works on Windows.
> >
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My Kernel bug is celebrating 2 years. Can you help me fix it?

[Thomas Petazzoni]

Dear Peter Senna Tschudin,

On Tue, 4 Mar 2014 22:26:37 +0100, Peter Senna Tschudin wrote:
> I have reported a bug more than two years ago and it is still
> affecting me. The bug report gives some information:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=787299
> 
> I have tried basic debug instructions from:
> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
> 
> And everything works as expected when:
> # echo freeze > /sys/power/state
> # echo disk > /sys/power/state
> 
> I have asked for help for fixing it:
> https://lkml.org/lkml/2013/11/1/186
> 
> But I don't have a serial port. How can I debug this issue without a
> "real" serial port? Or what else can I try? How can I explore the hint
> about the problem only happening with VT-d enabled in BIOS? How can I
> explore the hint about the problem not happening if the option
> nox2apic is passed to the Kernel?

Something I would try in this situation is to boot with mem=<some value
smaller than the amount of RAM>, and then have the kernel write some
debugging informations manually at a fixed location in RAM that has
been reserved by lowering the amount of RAM using mem=. Then, when you
reboot, you can dump what has been left in this memory location. Of
course this requires that 1/ this memory location is not overwritten by
the BIOS/bootloader and 2/ that you can do a warm reset to not loose
the contents of the memory. Since I don't do much x86 kernel hacking,
I never had to do that on x86, but I've used this trick a few times on
ARM platforms.

If that works, then it means you can put some debugging details all
over the kernel to find where things hand exactly during the resume
process.

Another embedded trick is to find a LED that you can easily turn
on/off. It is very useful to see if you reach a given portion of code
or not.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

My Kernel bug is celebrating 2 years. Can you help me fix it?

[Bjorn Helgaas]

[+cc Stoney, Yinghai, Suresh, Joerg, Jiang, Pavel, Rafael, linux-pm]

Let's add some folks who know about x2apic and VT-d.  It's hard for
people to magically pick stuff out of the LKML firehose :)

On Tue, Mar 4, 2014 at 2:26 PM, Peter Senna Tschudin
<peter.senna@gmail.com> wrote:
> I have reported a bug more than two years ago and it is still
> affecting me. The bug report gives some information:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=787299
>
> I have tried basic debug instructions from:
> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
>
> And everything works as expected when:
> # echo freeze > /sys/power/state
> # echo disk > /sys/power/state
>
> I have asked for help for fixing it:
> https://lkml.org/lkml/2013/11/1/186
>
> But I don't have a serial port. How can I debug this issue without a
> "real" serial port? Or what else can I try? How can I explore the hint
> about the problem only happening with VT-d enabled in BIOS? How can I
> explore the hint about the problem not happening if the option
> nox2apic is passed to the Kernel?
>
> Thank you,
>
> Peter
>
> P.S Yes, it works on Windows.
>
> --
> Peter
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo at vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Hurley]

On 03/06/2014 01:27 PM, Bjorn Helgaas wrote:
> [+cc Stoney, Yinghai, Suresh, Joerg, Jiang, Pavel, Rafael, linux-pm]
>
> Let's add some folks who know about x2apic and VT-d.  It's hard for
> people to magically pick stuff out of the LKML firehose :)
>
> On Tue, Mar 4, 2014 at 2:26 PM, Peter Senna Tschudin
> <peter.senna@gmail.com> wrote:
>> I have reported a bug more than two years ago and it is still
>> affecting me. The bug report gives some information:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=787299
>>
>> I have tried basic debug instructions from:
>> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
>>
>> And everything works as expected when:
>> # echo freeze > /sys/power/state
>> # echo disk > /sys/power/state
>>
>> I have asked for help for fixing it:
>> https://lkml.org/lkml/2013/11/1/186
>>
>> But I don't have a serial port. How can I debug this issue without a
>> "real" serial port? Or what else can I try? How can I explore the hint
>> about the problem only happening with VT-d enabled in BIOS? How can I
>> explore the hint about the problem not happening if the option
>> nox2apic is passed to the Kernel?
>>
>> Thank you,
>>
>> Peter
>>
>> P.S Yes, it works on Windows.

Windows 7 doesn't use x2apic mode.
Windows 8 does and this same problem happened with this model: see
http://forums.toshiba.com/t5/Windows-8-8-1/Resume-from-standby-issue-on-R830-PT321A-01K002/td-p/330110

Seems like your model was recently added to Toshiba's Windows 8
compatibility list: http://support.toshiba-tie.co.jp/windows8/list_au.htm

Check for a more recent BIOS update that may fix this problem.

Regards,
Peter Hurley

PS - kernel bugs are better filed on the kernel bugzilla https://bugzilla.kernel.org/

My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Senna Tschudin]

On Thu, Mar 6, 2014 at 8:08 PM, Peter Hurley <peter@hurleysoftware.com> wrote:
> On 03/06/2014 01:27 PM, Bjorn Helgaas wrote:
>>
>> [+cc Stoney, Yinghai, Suresh, Joerg, Jiang, Pavel, Rafael, linux-pm]
>>
>> Let's add some folks who know about x2apic and VT-d.  It's hard for
>> people to magically pick stuff out of the LKML firehose :)
>>
>> On Tue, Mar 4, 2014 at 2:26 PM, Peter Senna Tschudin
>> <peter.senna@gmail.com> wrote:
>>>
>>> I have reported a bug more than two years ago and it is still
>>> affecting me. The bug report gives some information:
>>>
>>> https://bugzilla.redhat.com/show_bug.cgi?id=787299
>>>
>>> I have tried basic debug instructions from:
>>> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
>>>
>>> And everything works as expected when:
>>> # echo freeze > /sys/power/state
>>> # echo disk > /sys/power/state
>>>
>>> I have asked for help for fixing it:
>>> https://lkml.org/lkml/2013/11/1/186
>>>
>>> But I don't have a serial port. How can I debug this issue without a
>>> "real" serial port? Or what else can I try? How can I explore the hint
>>> about the problem only happening with VT-d enabled in BIOS? How can I
>>> explore the hint about the problem not happening if the option
>>> nox2apic is passed to the Kernel?
>>>
>>> Thank you,
>>>
>>> Peter
>>>
>>> P.S Yes, it works on Windows.
>
>
> Windows 7 doesn't use x2apic mode.
> Windows 8 does and this same problem happened with this model: see
> http://forums.toshiba.com/t5/Windows-8-8-1/Resume-from-standby-issue-on-R830-PT321A-01K002/td-p/330110
Thank you for the information. The model is similar to mine, probably
the same motherboard. My tests were with Windows 7.

>
> Seems like your model was recently added to Toshiba's Windows 8
> compatibility list: http://support.toshiba-tie.co.jp/windows8/list_au.htm
>
> Check for a more recent BIOS update that may fix this problem.
I do that weekly since February last year, and there are no updates
available. The bad news is that the model was discontinued, so it is
possible that there will be no more BIOS updates. I'll write to
Toshiba Europe GmbH asking for a fix, by my hopes in getting an answer
are low.

>
> Regards,
> Peter Hurley
>
> PS - kernel bugs are better filed on the kernel bugzilla
> https://bugzilla.kernel.org/
Thank you!


-- 
Peter

My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Hurley]

[ +cc linux-acpi ]

On 03/07/2014 10:01 AM, Peter Senna Tschudin wrote:
> On Thu, Mar 6, 2014 at 8:08 PM, Peter Hurley <peter@hurleysoftware.com> wrote:
>> On 03/06/2014 01:27 PM, Bjorn Helgaas wrote:
>>>
>>> [+cc Stoney, Yinghai, Suresh, Joerg, Jiang, Pavel, Rafael, linux-pm]
>>>
>>> Let's add some folks who know about x2apic and VT-d.  It's hard for
>>> people to magically pick stuff out of the LKML firehose :)
>>>
>>> On Tue, Mar 4, 2014 at 2:26 PM, Peter Senna Tschudin
>>> <peter.senna@gmail.com> wrote:
>>>>
>>>> I have reported a bug more than two years ago and it is still
>>>> affecting me. The bug report gives some information:
>>>>
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=787299
>>>>
>>>> I have tried basic debug instructions from:
>>>> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
>>>>
>>>> And everything works as expected when:
>>>> # echo freeze > /sys/power/state
>>>> # echo disk > /sys/power/state
>>>>
>>>> I have asked for help for fixing it:
>>>> https://lkml.org/lkml/2013/11/1/186
>>>>
>>>> But I don't have a serial port. How can I debug this issue without a
>>>> "real" serial port? Or what else can I try? How can I explore the hint
>>>> about the problem only happening with VT-d enabled in BIOS? How can I
>>>> explore the hint about the problem not happening if the option
>>>> nox2apic is passed to the Kernel?
>>>>
>>>> Thank you,
>>>>
>>>> Peter
>>>>
>>>> P.S Yes, it works on Windows.
>>
>>
>> Windows 7 doesn't use x2apic mode.
>> Windows 8 does and this same problem happened with this model: see
>> http://forums.toshiba.com/t5/Windows-8-8-1/Resume-from-standby-issue-on-R830-PT321A-01K002/td-p/330110
> Thank you for the information. The model is similar to mine, probably
> the same motherboard. My tests were with Windows 7.

And more importantly, probably the same system firmware.


>> Seems like your model was recently added to Toshiba's Windows 8
>> compatibility list: http://support.toshiba-tie.co.jp/windows8/list_au.htm
>>
>> Check for a more recent BIOS update that may fix this problem.
> I do that weekly since February last year, and there are no updates
> available.  The bad news is that the model was discontinued, so it is
> possible that there will be no more BIOS updates. I'll write to
> Toshiba Europe GmbH asking for a fix, by my hopes in getting an answer
> are low.

Ok.

>>
>> Regards,
>> Peter Hurley
>>
>> PS - kernel bugs are better filed on the kernel bugzilla
>> https://bugzilla.kernel.org/
> Thank you!

I would file it under ACPI; perhaps a simple means of determining this
system firmware does not reliably support x2apic can be found (or perhaps not).

Please read REPORTING-BUGS; the latest is here
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/REPORTING-BUGS?id=refs/tags/v3.14-rc5

Good luck,
Peter Hurley