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Date:   Sat, 16 Sep 2017 21:25:59 +0900
From:   Satoru Takeuchi <satoru.takeuchi@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org
Subject: Re: [FYI] GCC segfaults under heavy multithreaded compilation with
 AMD Ryzen

2017-08-11 19:07 GMT+09:00 Borislav Petkov <bp@...en8.de>:
> On Wed, Jul 26, 2017 at 06:54:01AM +0900, Satoru Takeuchi wrote:
>> # I'm a LKML subscriber, but not a x86 list subscriber
>>
>> I found the following new linux kernel bugzilla about Ryzen related problem.
>> Since many developers don't check this bugzilla and I've also
>> encountered this problem,
>> I decided to introduce this problem here.
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=196481:
>> > I am running Ubuntu and installed the mainline kernel from the mainline PPA.
>> > It seems like the Ryzen processor has some bug that leads to gcc crashing
>> > when compiling a very large program under heavy load. This is easily reproduced
>> > in my system using the script from
>> >
>> > https://github.com/suaefar/ryzen-test
>> >
>> > (It assumes that you are running Ubuntu, maybe Debian also works. Just clone it and run the > script kill_ryzen.sh. It downloads the gcc 7.1 code and start multiple compilations of it. If any
>> > compilations fails its warns the user giving the time to detect failure).
>> >
>> > There is already a bug report about this in the FreeBSD bugzilla
>> > (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219399#c89).
>> > There is also a thread on the subject in AMD community forum
>> > (https://community.amd.com/thread/215773?start=300&tstart=0)
>> > and Phoronix (https://www.phoronix.com/forums/forum/hardware/processors-memory/955368-some-ryzen-linux-users-are-facing-issues-with-heavy-compilation-loads).
>
> Apparently, you can RMA your CPU:
>
> https://www.phoronix.com/scan.php?page=news_item&px=Ryzen-Segv-Response
>

Sorry for late reply and thank you for letting me know. I've already RMA'ed my
CPU and the new one works fine. I have one more Ryzen which I got for
investigating
this problem and I'll RMA it soon.

Regards,
Satoru

> --
> Regards/Gruss,
>     Boris.
>
> ECO tip #101: Trim your mails when you reply.
> --

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