linux-kernel - Re: [patch] x86, pat: freeing invalid memtype messages

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Message-ID: <20100618175726.GA2785@joi.lan>
Date:	Fri, 18 Jun 2010 19:57:26 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	Dan Carpenter <error27@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Jack Steiner <steiner@....com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [patch] x86, pat: freeing invalid memtype messages

On Fri, Jun 18, 2010 at 02:47:45PM +0800, Xiaotian Feng wrote:
> On 06/18/2010 12:17 AM, Marcin Slusarz wrote:
> > On Thu, Jun 17, 2010 at 03:45:59PM +0200, Dan Carpenter wrote:
> >> Commit 20413f27163 "x86, pat: Fix memory leak in free_memtype" added an
> >> error message in free_memtype() if rbt_memtype_erase() returns NULL.
> >> The problem is that if CONFIG_X86_PAT is enabled, we use a different
> >> implimentation of rbt_memtype_erase() that always returns NULL.
> >>
> >> I've modified rbt_memtype_erase() to return an ERR_PTR() on errors and
> >> made free_memtype() check for that instead.
> >>
> >> Addresses:  https://bugzilla.kernel.org/show_bug.cgi?id=16205
> >>
> >> Signed-off-by: Dan Carpenter<error27@...il.com>
> >
> > This patch is probably ok, but it does not address my bug.
> > I have CONFIG_X86_PAT=y, so rbt_memtype_erase does not always return NULL.
> 
> Could you please try boot with kernel parameter "debugpat", and
> show me the output of reserve_memtype/free_memtype ?
> 

reserve_memtype added 0xfed00000-0xfed01000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf780000-0xbf78d000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf79a000-0xbf79d000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf780000-0xbf781000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf7dc000-0xbf7dd000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf780000-0xbf781000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf780000-0xbf781000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf78f000-0xbf790000, track uncached-minus, req uncached-minus, ret uncached-minus
reserve_memtype added 0xbf78f000-0xbf790000, track uncached-minus, req uncached-minus, ret uncached-minus
free_memtype request 0xbf798000-0xbf799000
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
free_memtype request 0xbf798000-0xbf799000
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
free_memtype request 0xbf798000-0xbf799000
reserve_memtype added 0xbf798000-0xbf799000, track uncached-minus, req uncached-minus, ret uncached-minus
free_memtype request 0xbf798000-0xbf799000
reserve_memtype added 0xbf799000-0xbf79a000, track uncached-minus, req uncached-minus, ret uncached-minus
free_memtype request 0xbf799000-0xbf79a000
reserve_memtype added 0xbf799000-0xbf79a000, track uncached-minus, req uncached-minus, ret uncached-minus
swapper:1 freeing invalid memtype bf799000-bf79a000


http://kadu.net/~joi/kernel/2010.06.09/2.6.35-rc3-debugpat.txt

Marcin
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