linux-kernel - Re: [PATCH] Re: bad pmd ffff810000207238(9090909090909090).

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Message-ID: <20080528184006.GA14585@elte.hu>
Date:	Wed, 28 May 2008 20:40:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Fede <fedux@...men.org.ar>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jan Engelhardt <jengelh@...ozas.de>, Willy Tarreau <w@....eu>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] Re: bad pmd ffff810000207238(9090909090909090).


* Hugh Dickins <hugh@...itas.com> wrote:

> [PATCH] x86: fix bad pmd ffff810000207xxx(9090909090909090)
> 
> OGAWA Hirofumi and Fede have reported rare pmd_ERROR messages: 
> mm/memory.c:127: bad pmd ffff810000207xxx(9090909090909090).
> 
> Initialization's cleanup_highmap was leaving alignment filler behind 
> in the pmd for MODULES_VADDR: when vmalloc's guard page would occupy a 
> new page table, it's not allocated, and then module unload's vfree 
> hits the bad 9090 pmd entry left over.

applied, nice catch!

	Ingo
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