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Date: Wed, 16 Oct 2002 15:42:12 +0100 (BST)
From: Hugh Dickins <hugh@veritas.com>
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To: =?iso-8859-1?Q?Thomas_Lang=E5s?= <tlan@zet.no>
cc: linux-kernel@vger.kernel.org
Subject: Re: Kernel BUG at swap.c:62 [2.4.19 vanilla]
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On Wed, 16 Oct 2002, Thomas Lang?s wrote:
> kernel BUG at swap.c:62! 

Andrew Morton foresaw that race, and fixed it in 2.4.20-pre3:

--- 2.4.19/mm/swap.c	Wed Nov  7 06:44:20 2001
+++ 2.4.20-pre11/mm/swap.c	Wed Oct 16 11:18:44 2002
@@ -57,9 +57,10 @@
  */
 void lru_cache_add(struct page * page)
 {
-	if (!TestSetPageLRU(page)) {
+	if (!PageLRU(page)) {
 		spin_lock(&pagemap_lru_lock);
-		add_page_to_inactive_list(page);
+		if (!TestSetPageLRU(page))
+			add_page_to_inactive_list(page);
 		spin_unlock(&pagemap_lru_lock);
 	}
 }

-
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