linux-kernel - Re: 2.6.25-rc3-mm1 - BUG at system shutdown time

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Message-ID: <alpine.LFD.1.00.0803070931470.3099@apollo.tec.linutronix.de>
Date:	Fri, 7 Mar 2008 09:34:01 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Valdis.Kletnieks@...edu
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.25-rc3-mm1 - BUG at system shutdown time

On Fri, 7 Mar 2008, Valdis.Kletnieks@...edu wrote:

> On Fri, 07 Mar 2008 09:06:59 +0100, Thomas Gleixner said:
> > On Fri, 7 Mar 2008, Valdis.Kletnieks@...edu wrote:
> > > On Thu, 06 Mar 2008 22:16:02 PST, Andrew Morton said:
> > > > > [   74.254402] CPU 1 is now offline
> > > > > [   74.255395] SMP alternatives: switching to UP code
> > > > > [   74.256373] BUG: unable to handle kernel paging request at ffffffff8020a023
> > 
> > Can you decode ffffffff8020a023 via addr2line please ?
> 
> It's been a long day, and I couldn't get addr2line to work, it kept saying '??:0'.
> 
> However, this is in my System.map:
> 
> ffffffff8020a000 t poll_idle
> ffffffff8020a009 t do_nothing
> ffffffff8020a00f T set_personality_64bit
> ffffffff8020a041 T release_thread
> ffffffff8020a07d T arch_randomize_brk
> 
> so set_personality_64bit+0x14 or so?

Yeah. Sorry for making you do useless work. The meat is here:

> > [   74.256373] PGD 203067 PUD 207063 PMD 7e4cc163 PTE 20a161

----------------------------------------------------------^^^^^^

The PTE has the RW bit cleared, so the fault is not a big surprise.

Thanks,
	tglx
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