Subject: [v3.19 Regression] x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

Hello Jiang,

A kernel bug report was opened against Ubuntu [0]. It was found that
reverting the following commit resolves this bug:

commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
Author: Jiang Liu [off-list ref]
Date:   Mon Oct 27 16:11:52 2014 +0800

    x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

The regression was introduced as of v3.19-rc1.
    
I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?
    
    
Thanks,

Joe


[0] http://pad.lv/1440072

On 2015/7/14 3:36, Joseph Salisbury wrote:

Hello Jiang,

A kernel bug report was opened against Ubuntu [0]. It was found that
reverting the following commit resolves this bug:

commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
Author: Jiang Liu [off-list ref]
Date:   Mon Oct 27 16:11:52 2014 +0800

    x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

The regression was introduced as of v3.19-rc1.
    
I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?

Hi Joseph,
	Sorry for the trouble. It would be great if we could get
more information about the bug, such as bug report info, dmesg and
acpidump from the reporting system.
Thanks!
Gerry

On 07/13/2015 10:42 PM, Jiang Liu wrote:

On 2015/7/14 3:36, Joseph Salisbury wrote:

quoted

Hello Jiang,

A kernel bug report was opened against Ubuntu [0]. It was found that
reverting the following commit resolves this bug:

commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
Author: Jiang Liu [off-list ref]
Date:   Mon Oct 27 16:11:52 2014 +0800

    x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

The regression was introduced as of v3.19-rc1.
    
I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?

Hi Joseph,
	Sorry for the trouble. It would be great if we could get
more information about the bug, such as bug report info, dmesg and
acpidump from the reporting system.
Thanks!
Gerry

Hi Gerry,

Thanks for the response!  The full bug report can be seen here:
http://pad.lv/1440072

A bug was also opened on bugzilla.kernel.org(I see you already responded
there):
https://bugzilla.kernel.org/show_bug.cgi?id=101301

The dmesg output can be found here:
https://launchpadlibrarian.net/205757938/CurrentDmesg.txt

I'll request an acpidump from the reporting system.

Thanks again,

Joe

On 07/13/2015 10:42 PM, Jiang Liu wrote:

On 2015/7/14 3:36, Joseph Salisbury wrote:

quoted

Hello Jiang,

A kernel bug report was opened against Ubuntu [0]. It was found that
reverting the following commit resolves this bug:

commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
Author: Jiang Liu [off-list ref]
Date:   Mon Oct 27 16:11:52 2014 +0800

    x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

The regression was introduced as of v3.19-rc1.
    
I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?

Hi Joseph,
	Sorry for the trouble. It would be great if we could get
more information about the bug, such as bug report info, dmesg and
acpidump from the reporting system.
Thanks!
Gerry

Comments 3 and 4 have the requested information in the bugzilla bug:
https://bugzilla.kernel.org/show_bug.cgi?id=101301

Thanks again for the help!

Joe

On 2015/7/15 1:22, Joseph Salisbury wrote:

On 07/13/2015 10:42 PM, Jiang Liu wrote:

quoted

On 2015/7/14 3:36, Joseph Salisbury wrote:

quoted

Hello Jiang,

A kernel bug report was opened against Ubuntu [0]. It was found that
reverting the following commit resolves this bug:

commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
Author: Jiang Liu [off-list ref]
Date:   Mon Oct 27 16:11:52 2014 +0800

    x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

The regression was introduced as of v3.19-rc1.
    
I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?

Hi Joseph,
	Sorry for the trouble. It would be great if we could get
more information about the bug, such as bug report info, dmesg and
acpidump from the reporting system.
Thanks!
Gerry

Comments 3 and 4 have the requested information in the bugzilla bug:
https://bugzilla.kernel.org/show_bug.cgi?id=101301

Thanks again for the help!

Hi Joseph,
	According to my investigation, it's an ACPI BIOS issue instead
of a kernel bug. But it's actually a regression. Now we enforce stricter
check for ACPI SCI interrupt, which exposes an implementation flaw in
the virtual BIOS.

I have posted the analysis at
https://bugzilla.kernel.org/show_bug.cgi?id=101301
But I have no account at launchpad, so could you please help to copy
the message to launchpad?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072

Thanks!
Gerry

On 07/14/2015 11:17 PM, Jiang Liu wrote:

On 2015/7/15 1:22, Joseph Salisbury wrote:

quoted

On 07/13/2015 10:42 PM, Jiang Liu wrote:

quoted

On 2015/7/14 3:36, Joseph Salisbury wrote:

quoted

Hello Jiang,

A kernel bug report was opened against Ubuntu [0]. It was found that
reverting the following commit resolves this bug:

commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
Author: Jiang Liu [off-list ref]
Date:   Mon Oct 27 16:11:52 2014 +0800

    x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

The regression was introduced as of v3.19-rc1.
    
I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?

Hi Joseph,
	Sorry for the trouble. It would be great if we could get
more information about the bug, such as bug report info, dmesg and
acpidump from the reporting system.
Thanks!
Gerry

Comments 3 and 4 have the requested information in the bugzilla bug:
https://bugzilla.kernel.org/show_bug.cgi?id=101301

Thanks again for the help!

Hi Joseph,
	According to my investigation, it's an ACPI BIOS issue instead
of a kernel bug. But it's actually a regression. Now we enforce stricter
check for ACPI SCI interrupt, which exposes an implementation flaw in
the virtual BIOS.

I have posted the analysis at
https://bugzilla.kernel.org/show_bug.cgi?id=101301
But I have no account at launchpad, so could you please help to copy
the message to launchpad?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072

Thanks!
Gerry

Thanks for the analysis and feedback, Gerry.  I'll update the launchpad
bug with your info.

Thanks,

Joe