linux-kernel - Re: WARNING: kernel stack frame pointer at ffffffff82e03f40 in swapper:0 has bad value (null)

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Date:   Mon, 12 Dec 2016 12:10:25 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: kernel stack frame pointer at ffffffff82e03f40 in
 swapper:0 has bad value           (null)

On Mon, Dec 12, 2016 at 06:50:23PM +0100, Borislav Petkov wrote:
> [    0.000000] ffffffffbce03f40: 0000000000000000 ...
> [    0.000000] ffffffffbce03f48: ffffffffbc0001b5 (start_cpu+0x5/0x14)
> [    0.000000] ffffffffbce03f50: ffffffffbc0001b5 (start_cpu+0x5/0x14)
> [    0.000000] ffffffffbce03f58: 0000000000000000 ...
> [    0.000000] Linux version 4.9.0-rc8+ (root@...dor) (gcc version 6.2.0 20161109 (Debian 6.2.0-13) ) #2 SMP PREEMPT Mon Dec 12 18:36:48 CET 2016

Something funky is going on in the head code.  It looks like start_cpu
is getting executed twice somehow.  Need to do some more head
scratching...

-- 
Josh