linux-kernel - Re: [syzbot] [cgroups?] [mm?] WARNING in memcg1

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Message-Id: <20260121083526.81996ffd70ff4efc8484fd4d@linux-foundation.org>
Date: Wed, 21 Jan 2026 08:35:26 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Deepanshu Kartikey <kartikey406@...il.com>, syzbot
 <syzbot+079a3b213add54dd18a7@...kaller.appspotmail.com>,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 mhocko@...nel.org, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
 syzkaller-bugs@...glegroups.com, Muchun Song <muchun.song@...ux.dev>,
 Minchan Kim <minchan@...nel.org>, Kairui Song <ryncsn@...il.com>
Subject: Re: [syzbot] [cgroups?] [mm?] WARNING in memcg1_swapout

On Wed, 21 Jan 2026 09:58:42 -0500 Johannes Weiner <hannes@...xchg.org> wrote:

> > > I tested with the latest linux-next in sysbot. It is working fine
> > 
> > Great, thanks.  But we still don't have review for this one.
> 
> IOW, this is not necessary anymore. Kairui's (cc'd) fix which you
> picked up fixed the syzbot reported problem.
> 
> > For some reason I don't have cc:stable on this - could people
> > make a recommendation?
> 
> So this:
> 
> > From: Deepanshu Kartikey <kartikey406@...il.com>
> > Subject: mm/swap_cgroup: fix kernel BUG in swap_cgroup_record
> 
> can be dropped.
> 

OK, thanks, I'll drop Deepanshu's "mm/swap_cgroup: fix kernel BUG in
swap_cgroup_record".  I understand that Kairui's
mm-swap-use-swap-cache-as-the-swap-in-synchronize-layer-fix
(https://lkml.kernel.org/r/CAMgjq7CGUnzOVG7uSaYjzw9wD7w2dSKOHprJfaEp4CcGLgE3iw@mail.gmail.com)
has addressed this mm-unstable issue.


However Deepanshu's "mm/swap_cgroup: fix kernel BUG in
swap_cgroup_record" has

	Fixes: 1a4e58cce84e ("mm: introduce MADV_PAGEOUT")

Which I assume was mistaken?