From: Christoph Lameter Date: Sun, 30 Oct 2005 01:15:52 +0000 (-0700) Subject: [PATCH] slab: add additional debugging to detect slabs from the wrong node X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=09ad4bbc3a5c93316d7f4ffc0c310d9cbb28c2f0;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] slab: add additional debugging to detect slabs from the wrong node This patch adds some stack dumps if the slab logic is processing slab blocks from the wrong node. This is necessary in order to detect situations as encountered by Petr. Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/slab.c b/mm/slab.c index d30423f167a2..22bfb0b2ac8b 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2419,6 +2419,7 @@ retry: next = slab_bufctl(slabp)[slabp->free]; #if DEBUG slab_bufctl(slabp)[slabp->free] = BUFCTL_FREE; + WARN_ON(numa_node_id() != slabp->nodeid); #endif slabp->free = next; } @@ -2633,8 +2634,10 @@ static void free_block(kmem_cache_t *cachep, void **objpp, int nr_objects, int n check_spinlock_acquired_node(cachep, node); check_slabp(cachep, slabp); - #if DEBUG + /* Verify that the slab belongs to the intended node */ + WARN_ON(slabp->nodeid != node); + if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) { printk(KERN_ERR "slab: double free detected in cache " "'%s', objp %p\n", cachep->name, objp);