linux-kernel - Re: Kernel 4.1.6 Panic due to slab corruption

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Message-ID: <55EEEB6F.2090302@kyup.com>
Date:	Tue, 8 Sep 2015 17:06:39 +0300
From:	Nikolay Borisov <kernel@...p.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Marian Marinov <mm@...com>,
	SiteGround Operations <operations@...eground.com>
Subject: Re: Kernel 4.1.6 Panic due to slab corruption



On 09/08/2015 04:58 PM, Christoph Lameter wrote:
> On Mon, 7 Sep 2015, Nikolay Borisov wrote:
> 
>> Did a bit more investigation and it turns out the
>> corruption is happening in slab_alloc_node, in the
>> 'else' branch when get_freepointer is being called:
> 
> Please reboot the system and specify
> 
> 	slub_debug
> 

Unfortunately I haven't found a way to reproduce it so the only option
would be to do this on a live server. However, the performance impact I
believe is going to be very prohibitive :(.  Alternatively what I could
do is probably leave merging on but enable debugging only for the
kmalloc-32 slab cache. Do you think this would provide enough
information to help track the corruption when it happens, without
impacting performance?

> on the kernel command line. This will enable additional diagnostics which
> will allow tracking down the issue to the subsystem causing it.
> 
> 
> Or rebuild with
> 
> CONFIG_SLUB_DEBUG_ON
> 
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