We have a race where we try to migrate an invalid page, resulting in hitting VM_BUG_ON_PAGE in isolate_huge_page(). queue_pages_hugetlb() is OK to fail, so let's check !PageHeadHuge to keep invalid hugepage from queuing. Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx> Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> --- mm/mempolicy.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git v3.14-rc7-mmotm-2014-03-18-16-37.orig/mm/mempolicy.c v3.14-rc7-mmotm-2014-03-18-16-37/mm/mempolicy.c index 9d2ef4111a4c..ae6e2d9dc855 100644 --- v3.14-rc7-mmotm-2014-03-18-16-37.orig/mm/mempolicy.c +++ v3.14-rc7-mmotm-2014-03-18-16-37/mm/mempolicy.c @@ -530,6 +530,17 @@ static int queue_pages_hugetlb(pte_t *pte, unsigned long addr, if (!pte_present(entry)) return 0; page = pte_page(entry); + + /* + * Trinity found that page could be a non-hugepage. This is an + * unexpected behavior, but it's not clear how this problem happens. + * So let's simply skip such corner case. Page migration can often + * fail for various reasons, so it's ok to just skip the address + * unsuitable to hugepage migration. + */ + if (!PageHeadHuge(page)) + return 0; + nid = page_to_nid(page); if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) return 0; -- 1.8.5.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>