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From: Shakeel Butt To: syzbot Cc: akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, syzkaller-bugs@googlegroups.com, zhengqi.arch@bytedance.com, yosry@kernel.org Subject: Re: [syzbot] [mm?] [cgroups?] WARNING: bad unlock balance in lruvec_stat_mod_folio Message-ID: References: <69d54494.050a0220.3030df.0002.GAE@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <69d54494.050a0220.3030df.0002.GAE@google.com> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 5B78214000B X-Stat-Signature: cr5wkrm8asenor7zaw15wx5s3wp3pxy3 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1776119339-848534 X-HE-Meta: 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 bZ7x8Jgy 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: +Qi & Yosry On Tue, Apr 07, 2026 at 10:53:24AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: cc13002a9f98 Add linux-next specific files for 20260402 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10d8946a580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4e6c8be618ab359 > dashboard link: https://syzkaller.appspot.com/bug?extid=1a3353a77896e73a8f53 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. Let's wait for the reproducer. I can only think of cgroup_subsys_on_dfl() check returning different value in get_non_dying_memcg_start() and get_non_dying_memcg_end() to cause this uneven rcu unlock. However I can't think why and how that can happen.