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Date: Wed, 28 May 2008 20:40:06 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Hugh Dickins <hugh@veritas.com>
Cc: Fede <fedux@lugmen.org.ar>, Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
       Jan Engelhardt <jengelh@medozas.de>, Willy Tarreau <w@1wt.eu>,
       Arjan van de Ven <arjan@infradead.org>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org
Subject: Re: [PATCH] Re: bad pmd ffff810000207238(9090909090909090).
Message-ID: <20080528184006.GA14585@elte.hu>
References: <483CBCDD.10401@lugmen.org.ar> <Pine.LNX.4.64.0805281922530.7959@blonde.site>
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* Hugh Dickins <hugh@veritas.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