linux-kernel - Re: NULL pointer dereference BUG in check_preempt

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Date:   Tue, 6 Jun 2017 10:18:10 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Sowadski. Craig" <sowadski@...er.mst.edu>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: NULL pointer dereference BUG in check_preempt_wakeup

On Sat, Jun 03, 2017 at 12:45:08PM -0500, Sowadski. Craig wrote:
> Hello,
> 
> I have been having random lockups with my new Ryzen build. I have
> finally setup a serial console and received the Oops info below. I
> have had the problem with 4.10, 4.11, 4.11.2, and 4.11.3, but this is
> the only trap of info I have so I do not know that all my lockups are
> of the same nature. I'm not sure what to investigate to further help
> debug this. Please let me know if there is anything I can provide.

You can try to catch a couple more of those. Please use (it
probably won't matter but still) the tip's master branch here:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git

Also, each time, send the whole console output from boot to lockup.
Privately is fine too.

Thanks.

-- 
Regards/Gruss,
    Boris.

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