linux-kernel - [BUGFIX][PATCH 0/3] fix bug for /proc/kcore causes panic (Was: [Bugme-new] [Bug 13850] New: reading /proc/kcore causes oops

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Date:	Fri, 31 Jul 2009 16:07:48 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Mike Smith <scgtrp@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	Amerigo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [BUGFIX][PATCH 0/3] fix bug for /proc/kcore causes panic  (Was:
 [Bugme-new] [Bug 13850] New: reading /proc/kcore causes oops

On Wed, 29 Jul 2009 12:32:09 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Tue, 28 Jul 2009 22:46:56 -0400
> Mike Smith <scgtrp@...il.com> wrote:
> 
> > > What's layout of memory does your server have ?
> > The log I gave was from my desktop, so I'll assume you wanted that
> > instead of the server:
> > [mike: mike in ~]$ grep "System RAM" /proc/iomem
> > 00010000-0009efff : System RAM
> > 00100000-1dedffff : System RAM
> > 
> From this, your kernel's valid direct-map address range will be
> 
> c0010000-c009efff
> c0100000-ddedffff
> 
Ok, I reproduced the bug on x86-32 and here is a fix.

I reproduced the bug on x86-32 host with mem=512M boot option.

As I expected, the bug is from holes in vmalloc area.
(This hole means thera are a memory hole withing [start ...start+size-PAGE_SIZE) 
 of valid vm_struct.)

For review, I divided all into 3 patches. all series will be reply to this email.

Thanks,
-Kame

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