linux-kernel - Re: WARNING: at kernel/cpu/idle.c:96

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Date:	Thu, 2 May 2013 13:30:11 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: WARNING: at kernel/cpu/idle.c:96

On 2013.05.02 at 12:43 +0200, Thomas Gleixner wrote:
> On Tue, 30 Apr 2013, Markus Trippelsdorf wrote:
> 
> > Just booted todays git tree and got the following warning:
> > 
> > ------------[ cut here ]------------
> > WARNING: at kernel/cpu/idle.c:96 cpu_startup_entry+0x14d/0x160()
> > Hardware name: System Product Name
> > Pid: 0, comm: swapper/2 Not tainted 3.9.0-03462-gab86e97-dirty #424
> > Call Trace:
> > smpboot: Booting Node   0, Processors  #1 #2
> >  [<ffffffff8105b7c0>] ? warn_slowpath_common+0x60/0xa0
> >  [<ffffffff8108c26d>] ? cpu_startup_entry+0x14d/0x160
> > ---[ end trace 40a24a5550891913 ]---
> 
> Fix below.

Unfortunately the fix doesn't work:

------------[ cut here ]------------
WARNING: at kernel/cpu/idle.c:96 cpu_startup_entry+0x14d/0x160()
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 3.9.0-07391-g20b4fb4-dirty #432
Hardware name: System manufacturer System Product Name/M4A78T-E, BIOS 3503    04/13/2011
 ffffffff81528e8b ffffffff8105b791 ffff8802168b1fd8 ffff8802168b1fd8
 ffff8802168b1fd8 ffff8802168b1fd8 ffff8802168b1fd8 ffffffff8108cc8d
 0000000010001b76 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff81528e8b>] ? dump_stack+0xc/0x15
 [<ffffffff8105b791>] ? warn_slowpath_common+0x51/0x80
 [<ffffffff8108cc8d>] ? cpu_startup_entry+0x14d/0x160
---[ end trace 35da8e4b222a0736 ]---

BTW another issue is that "perf top" shows the following on an otherwise idle
machine:

 67.76%  [kernel]                    [k] cpu_startup_entry
 12.90%  [kernel]                    [k] amd_e400_idle

-- 
Markus
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