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Date: Fri, 24 Aug 2018 09:30:22 -0700
From: Guenter Roeck <linux@roeck-us.net>
To: Guillaume Tucker <guillaume.tucker@collabora.com>
Cc: Andi Kleen <ak@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        David Woodhouse <dwmw@amazon.co.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        kernel-build-reports@lists.linaro.org, stable@vger.kernel.org,
        Matt Hart <matthew.hart@linaro.org>
Subject: Re: stable/linux-4.4.y boot: 124 boots: 3 failed, 117 passed with 2
 offline, 1 untried/unknown, 1 conflict (v4.4.151)
Message-ID: <20180824163022.GA5551@roeck-us.net>
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 <d119ece0-7cb8-cfbe-1806-4f49cecdd516@collabora.com>
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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.

Thanks,
Guenter