On Wed, Feb 09, 2011 at 03:52:46PM +0900, KAMEZAWA Hiroyuki wrote:

On Wed, 9 Feb 2011 15:50:01 +0900
Daisuke Nishimura [off-list ref] wrote:

quoted

quoted

In hex, pc->flags was 7A00000000004 and this means PCG_USED bit is set.
This implies page_remove_rmap() may not be called but ->mapping is NULL. Hmm?
(7A is encoding of section number.)

Sigh.. it seems another freed-but-not-uncharged problem..

Ah, ok, this is maybe caused by this. I'm sorry that I missed this.
==
static inline int free_pages_check(struct page *page)
{
        if (unlikely(page_mapcount(page) |
                (page->mapping != NULL)  |
                (atomic_read(&page->_count) != 0) |
                (page->flags & PAGE_FLAGS_CHECK_AT_FREE) |
                (mem_cgroup_bad_page_check(page)))) {    <==========(*)
                bad_page(page);
                return 1;
==

Then, ok, this is a memcgroup and hugepage issue.

I'll look into.

Yes, the rest of the info on the page looked ok and shouldn't have
triggered a bad_page call. Thanks so much for looking into it.

Andrea

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