Le lundi 21 novembre 2011 à 17:10 +0100, Markus Trippelsdorf a écrit : > Sure. This one happend with CONFIG_DEBUG_PAGEALLOC=y: > > [drm] Initialized radeon 2.11.0 20080528 for 0000:01:05.0 on minor 0 > loop: module loaded > ahci 0000:00:11.0: version 3.0 > ahci 0000:00:11.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 > ahci 0000:00:11.0: AHCI 0001.0100 32 slots 6 ports 3 Gbps 0x3f impl SATA mode > ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part ccc > scsi0 : ahci > scsi1 : ahci > ============================================================================= > BUG task_struct: Poison overwritten > ----------------------------------------------------------------------------- Unfortunately thats the same problem, not catched by DEBUG_PAGEALLOC because freed page is immediately reused. We should keep pages in free list longer, to have a bigger window. Hmm... Please try following patch : diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9dd443d..b8932a6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1196,7 +1196,7 @@ void free_hot_cold_page(struct page *page, int cold) } pcp = &this_cpu_ptr(zone->pageset)->pcp; - if (cold) + if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) || cold) list_add_tail(&page->lru, &pcp->lists[migratetype]); else list_add(&page->lru, &pcp->lists[migratetype]); -- 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>