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

[Eric Dumazet <eric.dumazet@gmail.com>]

Le lundi 21 novembre 2011 A  17:52 +0100, Eric Dumazet a A(C)crit :
> Le lundi 21 novembre 2011 A  17:10 +0100, Markus Trippelsdorf a A(C)crit :
> 
> > 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]);
> 


Also add "slub_max_order=0" to your boot command, since it will make the
pool larger...





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