Re: random insta-reboots on AMD Phenom II

From	Adam Borowski <kilobyte@angband.pl>
Newsgroups	linux.kernel
Subject	Re: random insta-reboots on AMD Phenom II
Date	2017-10-01 15:10 +0200
Message-ID	<uvMam-2AV-7@gated-at.bofh.it> (permalink)
References	<uvfo5-69K-3@gated-at.bofh.it> <uvnYl-3oZ-7@gated-at.bofh.it> <uvo81-3sE-9@gated-at.bofh.it> <uvoB5-3DX-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Sat, Sep 30, 2017 at 01:53:02PM +0200, Borislav Petkov 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:

> Boot into -rc2+ and do as root:
> 
> # wrmsr -a 0xc0010015 0x1000018

Seems to help, thus it's indeed this issue.  I failed to mention that "once
per day" meant a day of regular use, of which heavy loads were only a tiny
fraction.  I've applied this register setting, then kept the machine busy
(mostly with randconfig kernel builds) for a day, no explosions yet -- so
there's a good chance the problem would have triggered.

> 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.

I have no clue about these matters so I'll leave it to you guys.  But, as
the other report I see gives different effects (frequent segfaults vs rare
insta-reboots), you do want to include my machine in testing.

Thanks for the workaround!

Meow!
-- 
⢀⣴⠾⠻⢶⣦⠀ We domesticated dogs 36000 years ago; together we chased
⣾⠁⢰⠒⠀⣿⡁ animals, hung out and licked or scratched our private parts.
⢿⡄⠘⠷⠚⠋⠀ Cats domesticated us 9500 years ago, and immediately we got
⠈⠳⣄⠀⠀⠀⠀ agriculture, towns then cities.     -- whitroth on /.

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

random insta-reboots on AMD Phenom II Adam Borowski <kilobyte@angband.pl> - 2017-09-30 04:10 +0200
  Re: random insta-reboots on AMD Phenom II Borislav Petkov <bp@alien8.de> - 2017-09-30 13:20 +0200
    Re: random insta-reboots on AMD Phenom II Adam Borowski <kilobyte@angband.pl> - 2017-09-30 13:30 +0200
      Re: random insta-reboots on AMD Phenom II Borislav Petkov <bp@alien8.de> - 2017-09-30 14:00 +0200
        Re: random insta-reboots on AMD Phenom II Markus Trippelsdorf <markus@trippelsdorf.de> - 2017-09-30 14:50 +0200
          Re: random insta-reboots on AMD Phenom II Brian Gerst <brgerst@gmail.com> - 2017-09-30 16:30 +0200
            Re: random insta-reboots on AMD Phenom II Markus Trippelsdorf <markus@trippelsdorf.de> - 2017-09-30 17:30 +0200
          Re: random insta-reboots on AMD Phenom II Borislav Petkov <bp@alien8.de> - 2017-09-30 18:00 +0200
            Re: random insta-reboots on AMD Phenom II Andy Lutomirski <luto@kernel.org> - 2017-09-30 18:10 +0200
        Re: random insta-reboots on AMD Phenom II Andy Lutomirski <luto@amacapital.net> - 2017-09-30 17:20 +0200
          Re: random insta-reboots on AMD Phenom II Borislav Petkov <bp@alien8.de> - 2017-09-30 17:50 +0200
        Re: random insta-reboots on AMD Phenom II Adam Borowski <kilobyte@angband.pl> - 2017-10-01 15:10 +0200

csiph-web