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    SubjectRe: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
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    Le lundi 21 novembre 2011 à 17:52 +0100, Eric Dumazet a écrit :
    > 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]);
    >


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





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