linux-kernel - Re: random insta-reboots on AMD Phenom II

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Message-ID: <20170930115302.ezvch7pdx7ws2k5h@pd.tnic>
Date:   Sat, 30 Sep 2017 13:53:02 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        x86-ml <x86@...nel.org>
Subject: Re: random insta-reboots on AMD Phenom II

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.

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.