On Mon, 3 Feb 2014, Vlastimil Babka wrote: > It seems to come from balloon_page_movable() and its test page_count(page) == > 1. > Hmm, I think it might be because compound_head() == NULL here. Holger, this looks like a race condition when allocating a compound page, did you only see it once or is it actually reproducible? I think this happens when a new compound page is allocated and PageBuddy is cleared before prep_compound_page() and then we see PageTail(p) set but p->first_page is not yet initialized. Is there any way to avoid memory barriers in compound_page()? -- 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>