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Subject: Re: random insta-reboots on AMD Phenom II
From: Andy Lutomirski <luto@amacapital.net>
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In-Reply-To: <20170930115302.ezvch7pdx7ws2k5h@pd.tnic>
Date: Sat, 30 Sep 2017 08:11:51 -0700
Cc: Adam Borowski <kilobyte@angband.pl>, linux-kernel@vger.kernel.org,
        Andy Lutomirski <luto@kernel.org>, x86-ml <x86@kernel.org>
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To: Borislav Petkov <bp@alien8.de>
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> On Sep 30, 2017, at 4:53 AM, Borislav Petkov <bp@alien8.de> wrote:
> 
>> On Sat, Sep 30, 2017 at 01:29:03PM +0200, Adam Borowski wrote:
>>> On Sat, Sep 30, 2017 at 01:11:37PM +0200, Borislav Petkov wrote:
>>>> On Sat, Sep 30, 2017 at 04:05:16AM +0200, Adam Borowski wrote:
>>>> Any hints how to debug this?
>>> 
>>> Do
>>> rdmsr -a 0xc0010015
>>> as root and paste it here.
>> 
>> 1000010
>> 1000010
>> 1000010
>> 1000010
>> 1000010
>> 1000010
>> 
>> on both 4.13.4 and 4.14-rc2+.
> 
> Boot into -rc2+ and do as root:
> 
> # wrmsr -a 0xc0010015 0x1000018
> 
> If the issue gets fixed then Mr. Luto better revert the new lazy TLB
> flushing fun'n'games for 4.14 before it is too late and that kernel
> releases b0rked.

Yeah, working on it.  It's not a straightforward revert.

> 
> Thx.
> 
> -- 
> Regards/Gruss,
>    Boris.
> 
> Good mailing practices for 400: avoid top-posting and trim the reply.