From: Johannes Weiner <hannes@cmpxchg.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Deepanshu Kartikey <kartikey406@gmail.com>,
syzbot <syzbot+079a3b213add54dd18a7@syzkaller.appspotmail.com>,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, mhocko@kernel.org, roman.gushchin@linux.dev,
shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com,
Muchun Song <muchun.song@linux.dev>,
Minchan Kim <minchan@kernel.org>, Kairui Song <ryncsn@gmail.com>
Subject: Re: [syzbot] [cgroups?] [mm?] WARNING in memcg1_swapout
Date: Wed, 21 Jan 2026 12:01:25 -0500 [thread overview]
Message-ID: <aXEGZUb4TkuIUsvT@cmpxchg.org> (raw)
In-Reply-To: <20260121083526.81996ffd70ff4efc8484fd4d@linux-foundation.org>
On Wed, Jan 21, 2026 at 08:35:26AM -0800, Andrew Morton wrote:
> On Wed, 21 Jan 2026 09:58:42 -0500 Johannes Weiner <hannes@cmpxchg.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@gmail.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.
Yes.
> 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?
Yes, this appeared to be a misdiagnosis of the bug sequence.
MADV_PAGEOUT was in the stacktrace, but not the culprit.
next prev parent reply other threads:[~2026-01-21 17:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-17 9:30 [syzbot] [cgroups?] [mm?] WARNING in memcg1_swapout syzbot
2026-01-18 0:57 ` Andrew Morton
2026-01-18 4:21 ` Deepanshu Kartikey
2026-01-18 7:01 ` Deepanshu Kartikey
2026-01-18 20:53 ` Andrew Morton
2026-01-20 21:20 ` Shakeel Butt
2026-01-21 14:58 ` Johannes Weiner
2026-01-21 16:35 ` Andrew Morton
2026-01-21 17:01 ` Johannes Weiner [this message]
2026-01-18 5:02 ` Forwarded: [PATCH] mm/vmscan: test build to verify VM_WARN_ON_ONCE fix syzbot
[not found] <20260118050237.1262510-1-kartikey406@gmail.com>
2026-01-18 6:39 ` [syzbot] [cgroups?] [mm?] WARNING in memcg1_swapout syzbot
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