Looking through the emails it seems that there is an issue with alias
strings. That can be solved by duping the name of the slab earlier in
kmem_cache_create().
Does this patch fix the issue?
Subject: slub: Dup name earlier in kmem_cache_create
Dup the name earlier in kmem_cache_create so that alias
processing is done using the copy of the string and not
the string itself.
Signed-off-by: Christoph Lameter <c...@linux.com>
---
mm/slub.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-06-11 08:49:56.000000000 -0500
+++ linux-2.6/mm/slub.c 2012-07-03 15:17:37.000000000 -0500
@@ -3933,8 +3933,12 @@ struct kmem_cache *kmem_cache_create(con
if (WARN_ON(!name))
return NULL;
+ n = kstrdup(name, GFP_KERNEL);
+ if (!n)
+ goto out;
+
down_write(&slub_lock);
- s = find_mergeable(size, align, flags, name, ctor);
+ s = find_mergeable(size, align, flags, n, ctor);
if (s) {
s->refcount++;
/*
@@ -3944,7 +3948,7 @@ struct kmem_cache *kmem_cache_create(con
s->objsize = max(s->objsize, (int)size);
s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
- if (sysfs_slab_alias(s, name)) {
+ if (sysfs_slab_alias(s, n)) {
s->refcount--;
goto err;
}
@@ -3952,31 +3956,26 @@ struct kmem_cache *kmem_cache_create(con
return s;
}
- n = kstrdup(name, GFP_KERNEL);
- if (!n)
- goto err;
-
s = kmalloc(kmem_size, GFP_KERNEL);
if (s) {
if (kmem_cache_open(s, n,
size, align, flags, ctor)) {
list_add(&s->list, &slab_caches);
up_write(&slub_lock);
- if (sysfs_slab_add(s)) {
- down_write(&slub_lock);
- list_del(&s->list);
- kfree(n);
- kfree(s);
- goto err;
- }
- return s;
+ if (!sysfs_slab_add(s))
+ return s;
+
+ down_write(&slub_lock);
+ list_del(&s->list);
}
kfree(s);
}
- kfree(n);
+
err:
+ kfree(n);
up_write(&slub_lock);
+out:
if (flags & SLAB_PANIC)
panic("Cannot create slabcache %s\n", name);
else
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