Re: stable/linux-4.4.y boot: 124 boots: 3 failed, 117 passed with 2 offline, 1 untried/unknown, 1 conflict (v4.4.151)

[Guillaume Tucker <guillaume.tucker@collabora.com>]

On 24/08/18 18:41, Guenter Roeck wrote:
> On Fri, Aug 24, 2018 at 09:30:22AM -0700, Guenter Roeck wrote:
>> Hi Guillaume,
>>
>> On Fri, Aug 24, 2018 at 08:32:07AM +0100, Guillaume Tucker wrote:
>>> On 22/08/18 14:51, kernelci.org bot wrote:
>>>> stable/linux-4.4.y boot: 124 boots: 3 failed, 117 passed with 2 offline, 1 untried/unknown, 1 conflict (v4.4.151)
>>>>
>>>> Full Boot Summary: https://kernelci.org/boot/all/job/stable/branch/linux-4.4.y/kernel/v4.4.151/
>>>> Full Build Summary: https://kernelci.org/build/stable/branch/linux-4.4.y/kernel/v4.4.151/
>>>>
>>>> Tree: stable
>>>> Branch: linux-4.4.y
>>>> Git Describe: v4.4.151
>>>> Git Commit: 78f654f6cce3442937b8c7eb4b640357871363c1
>>>> Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>>>> Tested: 43 unique boards, 20 SoC families, 22 builds out of 191
>>>>
>>>> Boot Regressions Detected:
>>> [...]
>>>> x86:
>>>>
>>>>     defconfig+kvm_guest:
>>>>         x86-x5-z8350:
>>>>             lab-mhart: failing since 6 days (last pass: v4.4.147 - first fail: v4.4.148)
>>>>
>>>>     x86_64_defconfig:
>>>>         x86-x5-z8350:
>>>>             lab-mhart: failing since 6 days (last pass: v4.4.147 - first fail: v4.4.148)
>>>
>>> We've had a couple of automated boot bisections pointing at the
>>> same commit on an x86 Atom x5-Z8350 platform (AAEON UP-CHT01),
>>> please see details below.  The issue seems to have started with
>>> v4.4.148.
>>>
>>
>> Can you test if a backport of upstream commit d367cef0a7f0 ("x86/mm/pat:
>> Fix boot crash when 1GB pages are not supported by the CPU") fixes
>> the problem ? It doesn't apply cleanly, but the conflict is easy to
>> resolve.
>>
> 
> We also may have to reapply commit 87e2bd898d3a ("x86/mm/pat: Ensure cpa->pfn
> only contains page frame numbers") and fix whatever problems it had.

I've applied these 2 patches on top of v4.4.152:

  https://gitlab.collabora.com/gtucker/linux/commits/linux-4.4.152-bisect-atom-x5

Then I've run the tests using these 2 commits, but they both
still failed to boot on that platform:

  http://lava.streamtester.net/scheduler/job/145549
  http://lava.streamtester.net/scheduler/job/145548

For the record, here's the same test with v4.4.147 that works:

  http://lava.streamtester.net/scheduler/job/145547

Let me know if you have other fixes to apply, I can take another
look at some point next week.

Guillaume