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Date: Wed, 18 Oct 2006 14:49:39 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: Paul Mackerras <paulus@samba.org>
Subject: Re: kernel BUG in __cache_alloc_node at linux-2.6.git/mm/slab.c:3177!
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Here is patch to add some printk to try to figure out what is going on. 
Run with this and send me the console output leading up to the failure.


Index: linux-2.6.19-rc2-mm1/mm/slab.c
===================================================================
--- linux-2.6.19-rc2-mm1.orig/mm/slab.c	2006-10-17 18:43:47.000000000 -0500
+++ linux-2.6.19-rc2-mm1/mm/slab.c	2006-10-18 16:47:42.904912835 -0500
@@ -2005,6 +2005,7 @@ static int setup_cpu_cache(struct kmem_c
 		return enable_cpucache(cachep);
 
 	if (g_cpucache_up == NONE) {
+		printk(KERN_CRIT "setup_cpu_cache: NONE\n");
 		/*
 		 * Note: the first kmem_cache_create must create the cache
 		 * that's used by kmalloc(24), otherwise the creation of
@@ -2023,6 +2024,7 @@ static int setup_cpu_cache(struct kmem_c
 		else
 			g_cpucache_up = PARTIAL_AC;
 	} else {
+		printk(KERN_CRIT "setup_cpu_cache: PARTIAL\n");
 		cachep->array[smp_processor_id()] =
 			kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
 
@@ -2219,6 +2221,7 @@ kmem_cache_create (const char *name, siz
 	align = ralign;
 
 	/* Get cache's description obj. */
+	printk(KERN_CRIT "Get cache descritor\n");
 	cachep = kmem_cache_zalloc(&cache_cache, SLAB_KERNEL);
 	if (!cachep)
 		goto oops;
@@ -3082,6 +3085,7 @@ static inline void *____cache_alloc(stru
 	void *objp;
 	struct array_cache *ac;
 
+	printk(KERN_CRIT "__cache_alloc\n");
 	check_irq_off();
 	ac = cpu_cache_get(cachep);
 	if (likely(ac->avail)) {
@@ -3135,6 +3139,7 @@ static void *alternate_node_alloc(struct
 {
 	int nid_alloc, nid_here;
 
+	printk(KERN_CRIT "alternate_node_alloc\n");
 	if (in_interrupt() || (flags & __GFP_THISNODE))
 		return NULL;
 	nid_alloc = nid_here = numa_node_id();
@@ -3160,6 +3165,7 @@ void *fallback_alloc(struct kmem_cache *
 	struct zone **z;
 	void *obj = NULL;
 
+	printk(KERN_CRIT "fallback_alloc\n");
 	for (z = zonelist->zones; *z && !obj; z++)
 		if (zone_idx(*z) <= ZONE_NORMAL &&
 				cpuset_zone_allowed(*z, flags))
@@ -3181,6 +3187,8 @@ static void *__cache_alloc_node(struct k
 	void *obj;
 	int x;
 
+	printk("__cache_alloc_node %d\n", nodeid);
+
 	l3 = cachep->nodelists[nodeid];
 	BUG_ON(!l3);