linux-kernel - Re: [PATCH 1/1] slab: ensure slab->obj_exts is clear in a newly allocated slab page

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Message-ID: <32eb2a11-2079-450b-a34c-ca432f416500@suse.cz>
Date: Mon, 14 Apr 2025 12:24:08 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev,
 roman.gushchin@...ux.dev, cl@...ux.com, rientjes@...gle.com,
 harry.yoo@...cle.com, souravpanda@...gle.com, pasha.tatashin@...een.com,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] slab: ensure slab->obj_exts is clear in a newly
 allocated slab page

On 4/11/25 19:45, Suren Baghdasaryan wrote:
> On Fri, Apr 11, 2025 at 9:59 AM Suren Baghdasaryan <surenb@...gle.com> wrote:
> 
> Kent asked me to forward this (his email is misbehaving for some reason):
> 
> Yes, ktest doesn't flip on CONFIG_MEMCG.
> 
> Those checks you're talking about are also behind CONFIG_DEBUG_VM,
> which isn't normally on. I did do some runs with it on and it didn't

Hm yes I forgot we moved them to be DEBUG_VM or debug_pagealloc only.

> fire - only additional asserts Suren and I added - so something's
> missing.
> 
> In the meantime, this needs to go in quickly as a hotfix because it's
> a 6.15-rc1 regression, and I've been getting distros to enable memory
> allocation profiling and I'd be shocked if it doesn't cause memcg
> crashes as well.

I'll send it this week so rc3.