linux-kernel - Re: BUG() on apm resume in 2.6.18-rc2

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Message-ID: <20060727073838.GA12586@leiferikson.gentoo>
Date:	Thu, 27 Jul 2006 09:38:38 +0200
From:	Johannes Weiner <hnazfoo@...glemail.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: BUG() on apm resume in 2.6.18-rc2

Hi,

On Thu, Jul 27, 2006 at 12:08:56AM -0700, Andrew Morton wrote:
> (please always do reply-to-all)

Oh, sorry. Sometimes mutt doesn't recognize mails belonging to a list.

> That was an easy one - it crashed at
> 
> EIP is at mcheck_init+0x4/0x80
> 
> right at the start of mcheck_init(), so it had to be the access of
> mce_disabled.
> 
> It accessed the address c0729c38:
> 
> BUG: unable to handle kernel paging request at virtual address c0729c38
> 
> and the code dump shows an access to that address.
> 
> And the only way in which an access to a global variable of this nature can
> oops is if that variable has been unmapped from the kenrel address space. 
> We unmap (and reuse) the __init memory, so it had to be a sectioning bug.

The fix was clear to me, though. After seeing it, I could imagine what
went wrong.

Hannes
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