linux-kernel - Re: 2.6.18-rc3-mm2 [BUG at mm/vmscan.c:383!]

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Date:	Sun, 6 Aug 2006 15:55:43 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Mattia Dongili <malattia@...ux.it>
cc:	Andrew Morton <akpm@...l.org>, Nick Piggin <npiggin@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.18-rc3-mm2 [BUG at mm/vmscan.c:383!]

On Sun, 6 Aug 2006, Mattia Dongili wrote:
> [  781.988000] kernel BUG at mm/vmscan.c:383!
> [  781.988000] EIP is at remove_mapping+0xe8/0x120

You are so right: the minor fix below is needed.

> [  781.988000] DWARF2 unwinder stuck at kernel_thread_helper+0x5/0x10

Sorry, someone else will have to help with all that nuisance.


remove_mapping() must check against page_mapping(page):
&swapper_space is implicit, never actually stored in page->mapping.

Signed-off-by: Hugh Dickins <hugh@...itas.com>

--- 2.6.18-rc3-mm2/mm/vmscan.c	2006-08-06 12:25:40.000000000 +0100
+++ linux/mm/vmscan.c	2006-08-06 15:40:34.000000000 +0100
@@ -380,7 +380,7 @@ static pageout_t pageout(struct page *pa
 int remove_mapping(struct address_space *mapping, struct page *page)
 {
 	BUG_ON(!PageLocked(page));
-	BUG_ON(mapping != page->mapping);
+	BUG_ON(mapping != page_mapping(page));
 
 	write_lock_irq(&mapping->tree_lock);
 
-
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