linux-kernel - Re: kernel BUG at mm/vmscan.c:1114

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Date:	Tue, 2 Aug 2011 00:22:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel <linux-kernel@...r.kernel.org>,
	mgorman@...e.de
Subject: Re: kernel BUG at mm/vmscan.c:1114

On Tue, 2 Aug 2011 15:09:57 +0800 Xiaotian Feng <xtfeng@...il.com> wrote:

> __ __I'm hitting the kernel BUG at mm/vmscan.c:1114 twice, each time I
> was trying to build my kernel. The photo of crash screen and my config
> is attached.

hm, now why has that started happening?

Perhaps you could apply this debug patch, see if we can narrow it down?

--- a/mm/vmscan.c~a
+++ a/mm/vmscan.c
@@ -54,6 +54,8 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/vmscan.h>
 
+#define D() do { printk("%s:%d\n", __FILE__, __LINE__); } while (0)
+
 /*
  * reclaim_mode determines how the inactive list is shrunk
  * RECLAIM_MODE_SINGLE: Reclaim only order-0 pages
@@ -1018,27 +1020,37 @@ int __isolate_lru_page(struct page *page
 	int ret = -EINVAL;
 
 	/* Only take pages on the LRU. */
-	if (!PageLRU(page))
+	if (!PageLRU(page)) {
+		D();
 		return ret;
+	}
 
 	/*
 	 * When checking the active state, we need to be sure we are
 	 * dealing with comparible boolean values.  Take the logical not
 	 * of each.
 	 */
-	if (mode != ISOLATE_BOTH && (!PageActive(page) != !mode))
+	if (mode != ISOLATE_BOTH && (!PageActive(page) != !mode)) {
+		printk("mode:%d\n", mode);
+		D();
 		return ret;
+	}
 
-	if (mode != ISOLATE_BOTH && page_is_file_cache(page) != file)
+	if (mode != ISOLATE_BOTH && page_is_file_cache(page) != file) {
+		printk("mode: %d, pifc: %d, file: %d\n", mode,
+					page_is_file_cache(page), file);
+		D();
 		return ret;
-
+	}
 	/*
 	 * When this function is being called for lumpy reclaim, we
 	 * initially look into all LRU pages, active, inactive and
 	 * unevictable; only give shrink_page_list evictable pages.
 	 */
-	if (PageUnevictable(page))
+	if (PageUnevictable(page)) {
+		D();
 		return ret;
+	}
 
 	ret = -EBUSY;
 
_

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