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Wed, 21 Jan 2026 09:01:26 -0800 (PST) Date: Wed, 21 Jan 2026 12:01:25 -0500 From: Johannes Weiner To: Andrew Morton Cc: Deepanshu Kartikey , syzbot , 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 , Minchan Kim , Kairui Song Subject: Re: [syzbot] [cgroups?] [mm?] WARNING in memcg1_swapout Message-ID: References: <696b56b1.050a0220.3390f1.0007.GAE@google.com> <20260117165722.6dc25d72fd58254cb89e711b@linux-foundation.org> <20260118125311.e1894f598e2a8ef626f47f25@linux-foundation.org> <20260121083526.81996ffd70ff4efc8484fd4d@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 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 > > > 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.