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From: Andy Lutomirski <luto@amacapital.net>
Date: Tue, 26 Apr 2016 08:12:02 -0700
Message-ID: <CALCETrV6ZKLxKACkYVHrsAaZ8mFVZ_wr=DcsNYNxxsS3qnR1pQ@mail.gmail.com>
Subject: Re: Bisected: spontaneous reboot in early boot on x86-64 in 4.6-rc
To: Meelis Roos <mroos@linux.ee>
Cc: Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Linux Kernel list <linux-kernel@vger.kernel.org>
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On Tue, Apr 26, 2016 at 12:30 AM, Meelis Roos <mroos@linux.ee> wrote:
> Today I finished bisecting a boot problem on my IBM X346 (with 64-bit P4
> Xeons). 4.5.0 worked fine but I saw the spontaneous reboots during early
> boot in 4.6-rc4 and bisected it down to the commit below.
>
> The server does not seem to have NX - dmesg has this:
>
> Notice: NX (Execute Disable) protection missing in CPU!

I reproduced a failure under KVM, which might be your failure.
Digging around now.

--Andy