Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

[Eric Dumazet]

Le lundi 21 novembre 2011 Ã 17:10 +0100, Markus Trippelsdorf a Ãcrit :

> 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]);


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