linux-kernel - Re: WARNING: CPU: 1 PID: 495 at mm/slab_common.c:69 kmem_cache

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Date:	Fri, 18 Jul 2014 23:32:51 +0200
From:	poma <pomidorabelisima@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Christoph Hellwig <hch@....de>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Mailing-List fedora-kernel <kernel@...ts.fedoraproject.org>,
	Paolo Bonzini <pbonzini@...hat.com>, linux-scsi@...r.kernel.org
Subject: Re: WARNING: CPU: 1 PID: 495 at mm/slab_common.c:69 kmem_cache_create+0x1a9/0x330()

On 18.07.2014 22:16, poma wrote:
> On 18.07.2014 22:07, James Bottomley wrote:
>> 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;
>>
>>
>
> Man, I just now read it correctly - "So, if hostt->name contains spaces".
> Thanks.
>
> I'll be back.
>

Yea, I can confirm it works! :)
No warnings.


poma


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