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Received: from viro by zeniv.linux.org.uk with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1uo4Yi-000000078b6-0d8k; Mon, 18 Aug 2025 18:26:16 +0000 Date: Mon, 18 Aug 2025 19:26:16 +0100 From: Al Viro To: syzbot Cc: andrii@kernel.org, ast@kernel.org, bigeasy@linutronix.de, bpf@vger.kernel.org, brauner@kernel.org, daniel@iogearbox.net, davem@davemloft.net, eddyz87@gmail.com, edumazet@google.com, haoluo@google.com, jack@suse.cz, jiri@resnulli.us, john.fastabend@gmail.com, jolsa@kernel.org, kerneljasonxing@gmail.com, kpsingh@kernel.org, kuba@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, martin.lau@linux.dev, netdev@vger.kernel.org, pabeni@redhat.com, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, yonghong.song@linux.dev Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_umount (3) Message-ID: <20250818182616.GB222315@ZenIV> References: <67555b72.050a0220.2477f.0026.GAE@google.com> <68a2f584.050a0220.e29e5.009d.GAE@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <68a2f584.050a0220.e29e5.009d.GAE@google.com> X-Rspamd-Queue-Id: 2C7FD2000F X-Rspam-User: X-Stat-Signature: ojzxwp7n4upne4trafh88xqk8ni33h7s X-Rspamd-Server: rspam09 X-HE-Tag: 1755541588-555324 X-HE-Meta: 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 SoRxFBlH 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 JT0425Zh Z452LFAkaT06aIb3VU8gHzbV2hCmixj+cXvOsttXF4Z39jrJjp5IOiUmEhEs8sykTigLmHLD8BfMdo5ZFcMn6h/7CdK9p4AfQpc/NZ07RUNz/doENv7K2U95Uo92KBCC+TN2Q4FKf/M= 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 Mon, Aug 18, 2025 at 02:42:28AM -0700, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 8f5ae30d69d7 Linux 6.17-rc1 > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > console output: https://syzkaller.appspot.com/x/log.txt?x=1321eba2580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb > dashboard link: https://syzkaller.appspot.com/bug?extid=1ec0f904ba50d06110b1 > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cba442580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10a1eba2580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz > kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/43186d9e448c/mount_0.gz > fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=174ba442580000) > > The issue was bisected to: > > commit d15121be7485655129101f3960ae6add40204463 > Author: Paolo Abeni > Date: Mon May 8 06:17:44 2023 +0000 > > Revert "softirq: Let ksoftirqd do its job" Would be interesting to see how it behaves on git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #fixes (cda250b0fc83)