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Wed, 21 Jan 2026 09:01:27 -0800 (PST) Received: from localhost ([2603:7000:c01:2716:365a:60ff:fe62:ff29]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8946ecce11dsm23458376d6.31.2026.01.21.09.01.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260121083526.81996ffd70ff4efc8484fd4d@linux-foundation.org> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 9DCF014000C X-Stat-Signature: 1tw3m8mng9cmzoa1fofba67a16fdc85e X-Rspam-User: X-HE-Tag: 1769014888-353193 X-HE-Meta: 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 YgwrlYzs 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.