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

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Date:	Tue, 2 Aug 2011 10:15:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Xiaotian Feng <xtfeng@...il.com>, linux-mm@...ck.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: kernel BUG at mm/vmscan.c:1114

On Tue, 2 Aug 2011 15:24:59 +0100 Mel Gorman <mgorman@...e.de> wrote:

> On Tue, Aug 02, 2011 at 03:09:57PM +0800, Xiaotian Feng wrote:
> > Hi,
> > __ __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. Thanks.
> > Regards
> > Xiaotian
> 
> I am obviously blind because in 3.0, I cannot see what BUG is at
> mm/vmscan.c:1114 :(. I see
> 
> 1109:			/*
> 1110:			 * If we don't have enough swap space, reclaiming of
> 1111:			 * anon page which don't already have a swap slot is
> 1112:			 * pointless.
> 1113:			 */
> 1114:			if (nr_swap_pages <= 0 && PageAnon(cursor_page) &&
> 1115:			    !PageSwapCache(cursor_page))
> 1116:				break;
> 1117:
> 1118:			if (__isolate_lru_page(cursor_page, mode, file) == 0) {
> 1119:				list_move(&cursor_page->lru, dst);
> 1120:				mem_cgroup_del_lru(cursor_page);
> 
> Is this 3.0 vanilla or are there some other patches applied?
> 

"3.0.0+": Current mainline.

static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
		struct list_head *src, struct list_head *dst,
		unsigned long *scanned, int order, int mode, int file)
{
	unsigned long nr_taken = 0;
	unsigned long nr_lumpy_taken = 0;
	unsigned long nr_lumpy_dirty = 0;
	unsigned long nr_lumpy_failed = 0;
	unsigned long scan;

	for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
		struct page *page;
		unsigned long pfn;
		unsigned long end_pfn;
		unsigned long page_pfn;
		int zone_id;

		page = lru_to_page(src);
		prefetchw_prev_lru_page(page, src, flags);

		VM_BUG_ON(!PageLRU(page));

		switch (__isolate_lru_page(page, mode, file)) {
		case 0:
			list_move(&page->lru, dst);
			mem_cgroup_del_lru(page);
			nr_taken += hpage_nr_pages(page);
			break;

		case -EBUSY:
			/* else it is being freed elsewhere */
			list_move(&page->lru, src);
			mem_cgroup_rotate_lru_list(page, page_lru(page));
			continue;

		default:
-->>			BUG();
		}

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