Re: WARNING: CPU: 1 PID: 495 at mm/slab_common.c:69 kmem_cache_create+0x1a9/0x330()

James Bottomley
2014-07-18T20:07:29Z

On Fri, 2014-07-18 at 22:01 +0200, poma wrote:
> On 18.07.2014 16:17, Christoph Hellwig wrote:
> > On Fri, Jul 18, 2014 at 05:21:04PM +0400, Vladimir Davydov wrote:
> >> Slab warns, because the name of the cache being created contains spaces.
> >> The "bad" cache is created by scsi_get_host_cmd_pool. Its name
> >> (pool->cmd_name) is initialized by scsi_alloc_host_cmd_pool as follows:
> >>
> >> pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->name);
> >>
> >> So, if hostt->name contains spaces, the cache name will also contain
> >> spaces and we'll get the warning. And hostt->name can contain spaces,
> >> e.g. virtscsi_host_template_single.name="Virtio SCSI HBA".
> >
> > Or might not even be present. I'll send a patch to replace it with
> > ->proc_name, which must not contain spaces and is generally shorter
> > as well.
> >
>
> Is this what you thought?

No, he means this, if you want to try it.

James

---

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 88d46fe..eb07a9b 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -368,8 +368,8 @@ scsi_alloc_host_cmd_pool(struct Scsi_Host *shost)
if (!pool)
return NULL;

- pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->name);
- pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->name);
+ pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->proc_name);
+ pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->proc_name);
if (!pool->cmd_name || !pool->sense_name) {
scsi_free_host_cmd_pool(pool);
return NULL;