linux-kernel - Re: [PATCH] mm/slub: Add slub_debug option to panic on memory corruption

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Date:   Tue, 9 Mar 2021 20:14:30 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        akpm@...ux-foundation.org, cl@...ux.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com
Cc:     corbet@....net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub: Add slub_debug option to panic on memory
 corruption

Hi Vlastimil,

Thanks for the comment!

On 3/9/21 17:09, Vlastimil Babka wrote:
> On 3/9/21 2:47 PM, Georgi Djakov wrote:
>> Being able to stop the system immediately when a memory corruption
>> is detected is crucial to finding the source of it. This is very
>> useful when the memory can be inspected with kdump or other tools.
> 
> Is this in some testing scenarios where you would also use e.g. panic_on_warn?
> We could hook to that. If not, we could introduce a new
> panic_on_memory_corruption that would apply also for debug_pagealloc and whatnot?

I would prefer that we not tie it with panic_on_warn - there might be lots of
new code in multiple subsystems, so hitting some WARNing while testing is not
something unexpected.

Introducing an additional panic_on_memory_corruption would work, but i noticed
that we already have slub_debug and thought to re-use that. But indeed, аdding
an option to panic in for example bad_page() sounds also useful, if that's what
you suggest.

Thanks,
Georgi