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Regression introduced in v3.2.12 stable

DISCUSSION Joseph Salisbury 2 participants 6 messages Mar 22, 2012 PCI

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Joseph Salisbury

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#0 lore raw

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Hello,

I figured I'd send a heads up regarding a possible regression in v3.2.12 stable. The issue prevents systems from booting.

There have been a few bugs[0] reported against the Ubuntu kernel, which was recently rebased to 3.2.12. We're in the process of bisecting now and will post an update..

Thanks,

Joe

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/961482
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author
#1 lore raw
Quoted 11 lines · Joseph Salisbury

Hello,

I figured I'd send a heads up regarding a possible regression in v3.2.12 stable. The issue prevents systems from booting.

There have been a few bugs[0] reported against the Ubuntu kernel, which was recently rebased to 3.2.12. We're in the process of bisecting now and will post an update..

Thanks,

Quoted 8 lines

Joe

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/961482
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It's also been noted that this bug happens in the latest version of v3.3.

#2 lore raw
In reply to Joseph Salisbury
Quoted 6 lines · Joseph Salisbury

I figured I'd send a heads up regarding a possible regression in v3.2.12 stable. The issue prevents systems from booting.

There have been a few bugs[0] reported against the Ubuntu kernel, which was recently rebased to 3.2.12. We're in the process of bisecting now and will post an update..

What specifically happens here when the system does not boot? Any error message? Are you sure this isn't the known pci express issue showing up here?

Can you run 'git bisect' to trace it down to a specific patch please?

thanks,

greg k-h

author
#3 lore raw

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Quoted 12 lines · Greg KH
Quoted 6 lines · Joseph Salisbury

I figured I'd send a heads up regarding a possible regression in v3.2.12 stable. The issue prevents systems from booting.

There have been a few bugs[0] reported against the Ubuntu kernel, which was recently rebased to 3.2.12. We're in the process of bisecting now and will post an update..

What specifically happens here when the system does not boot? Any error message? Are you sure this isn't the known pci express issue showing up here?

Quoted 5 lines

Can you run 'git bisect' to trace it down to a specific patch please?

thanks,

greg k-h

Hi Greg,

Thanks for the response.

We did some bisecting/testing and identified the bad commit in 3.2.12 as the following:

f043ddb60c84ea64a23b755004572afe922e653c PCI: ignore pre-1.1 ASPM quirking when ASPM is disabled

drivers/pci/pcie/aspm.c +0 -0
index 1cfbf22..24f049e 100644

- --- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -500,6 +500,9 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)

        int pos;
        u32 reg32;

+ if (aspm_disabled)
+ return 0;
+
/*
* Some functions in a slot might not all be PCIe functions,
* very strange. Disable ASPM for the whole slot

Building a test kernel with this commit reverted allows the machines to boot. I see there has already been some discussion on this commit[0]

Thanks,

Joe

[0] https://lkml.org/lkml/2012/3/19/408
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#4 lore raw
Quoted 21 lines · Joseph Salisbury
Quoted 12 lines · Greg KH
Quoted 6 lines · Joseph Salisbury

I figured I'd send a heads up regarding a possible regression in v3.2.12 stable. The issue prevents systems from booting.

There have been a few bugs[0] reported against the Ubuntu kernel, which was recently rebased to 3.2.12. We're in the process of bisecting now and will post an update..

What specifically happens here when the system does not boot? Any error message? Are you sure this isn't the known pci express issue showing up here?

Quoted 5 lines

Can you run 'git bisect' to trace it down to a specific patch please?

thanks,

greg k-h

Hi Greg,

Quoted 7 lines

Thanks for the response.

We did some bisecting/testing and identified the bad commit in 3.2.12 as the following:

f043ddb60c84ea64a23b755004572afe922e653c PCI: ignore pre-1.1 ASPM quirking when ASPM is disabled

Yup, that's the known problem one. But, note that it does solve other people's problems at the moment, so you can't just ignore it :)

greg k-h

author
#5 lore raw

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Quoted 29 lines · Greg KH
Quoted 28 lines · Joseph Salisbury
Quoted 13 lines · Greg KH
Quoted 6 lines · Joseph Salisbury

I figured I'd send a heads up regarding a possible regression in v3.2.12 stable. The issue prevents systems from booting.

There have been a few bugs[0] reported against the Ubuntu kernel, which was recently rebased to 3.2.12. We're in the process of bisecting now and will post an update..

What specifically happens here when the system does not boot? Any error message? Are you sure this isn't the known pci express issue showing up here?

Quoted 6 lines

Can you run 'git bisect' to trace it down to a specific patch please?

thanks,

greg k-h

Hi Greg,

Thanks for the response.

We did some bisecting/testing and identified the bad commit in 3.2.12 as the following:

Quoted 8 lines
Quoted 2 lines

f043ddb60c84ea64a23b755004572afe922e653c PCI: ignore pre-1.1 ASPM quirking when ASPM is disabled

Yup, that's the known problem one. But, note that it does solve other people's problems at the moment, so you can't just ignore it :)

greg k-h

Thanks for the info, Greg. I'll keep up to date on the other thread. -----BEGIN PGP SIGNATURE-----
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