linux-kernel - Re: [PATCH] fix double unlock_page() in 2.6.26-rc5-mm3 kernel BUG at mm/filemap.c:575!

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Date:	Fri, 13 Jun 2008 00:34:33 -0400
From:	Valdis.Kletnieks@...edu
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	linux-mm@...ck.org, Nick Piggin <npiggin@...e.de>,
	Andy Whitcroft <apw@...dowen.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"Lee.Schermerhorn@...com" <Lee.Schermerhorn@...com>
Subject: Re: [PATCH] fix double unlock_page() in 2.6.26-rc5-mm3 kernel BUG at mm/filemap.c:575!

On Fri, 13 Jun 2008 10:44:44 +0900, KAMEZAWA Hiroyuki said:

> quick fix for double unlock_page();
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamewzawa.hiroyu@...fujitsu.com>
> Index: linux-2.6.26-rc5-mm3/mm/truncate.c
> ===================================================================
> --- linux-2.6.26-rc5-mm3.orig/mm/truncate.c
> +++ linux-2.6.26-rc5-mm3/mm/truncate.c
> @@ -104,8 +104,8 @@ truncate_complete_page(struct address_sp
>  
>  	cancel_dirty_page(page, PAGE_CACHE_SIZE);
>  
> -	remove_from_page_cache(page);
>  	clear_page_mlock(page);
> +	remove_from_page_cache(page);
>  	ClearPageUptodate(page);
>  	ClearPageMappedToDisk(page);
>  	page_cache_release(page);	/* pagecache ref */

Confirming this quick fix works on my laptop that was hitting this crash -
am now up and running on -rc5-mm3.

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