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SubjectRe: kernel BUG at mm/vmscan.c:1114
On Tue, 2 Aug 2011 15:09:57 +0800 Xiaotian Feng <xtfeng@gmail.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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