In the error path that we fail to allocate new huge page, before try again, we have to check race since page_table_lock is re-acquired. If racing, our job is done. Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx> --- --- a/mm/hugetlb.c Fri Nov 18 21:38:30 2011 +++ b/mm/hugetlb.c Fri Nov 18 21:48:15 2011 @@ -2407,7 +2407,14 @@ retry_avoidcopy: BUG_ON(page_count(old_page) != 1); BUG_ON(huge_pte_none(pte)); spin_lock(&mm->page_table_lock); - goto retry_avoidcopy; + ptep = huge_pte_offset(mm, address & huge_page_mask(h)); + if (likely(pte_same(huge_ptep_get(ptep), pte))) + goto retry_avoidcopy; + /* + * race occurs while re-acquiring page_table_lock, and + * our job is done. + */ + return 0; } WARN_ON_ONCE(1); } -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>