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Sun, 18 May 2025 21:39:55 -0700 (PDT) MIME-Version: 1.0 From: Guoyu Yin Date: Mon, 19 May 2025 12:39:44 +0800 X-Gm-Features: AX0GCFvcV0P9cCPFB1RYcgX8fK2UXRBnjjRIB5m2manzO5ZCnHuk61OyvNPeX2U Message-ID: Subject: [BUG] INFO: rcu detected stall in sys_io_submit To: anna-maria@linutronix.de Cc: frederic@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 976DA120003 X-Rspamd-Server: rspam09 X-Stat-Signature: ci1wiximgeki6yk3wmjxpm6hxxmbt8kg X-HE-Tag: 1747629596-639192 X-HE-Meta: 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 gx3cO9T7 rAqiBuyGWJ7M1w1TXXqTGq830hw53GtCLSNI623ZspJ0q2kzuaMajLp1vzqXwloV8OGEcr1ZyCF7fAy6MgLgiUpxptHcUKR2JImw6JfS/3ykPoSN6tiMKUCxK6GdAxq++om425KwjCHw9cA2tEn4dvxIAJqtWOcgjK2sTCpPIHS1H+POUC3kJeVvvTpFBkop+UWj32PQLSD2b/snQfJncNmXeBaSSuj2Eu1mCe2tEsJxfmfbMRm3LZbuDtWo45DJyF4nE+aHEirECbMILYjKcKj2FVDYjRyo4vs2uouYhcgTCp0t6VcckrzwECV1tEQI6XSNaigQRF7ndlaRGfb2iuwSdu1obfNednR5VTt7pZDF84xESR4i6RL70PrUexZJqR890 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: Hi, I discovered a kernel crash using the Syzkaller framework, described as "INFO: rcu detected stall in sys_io_submit". This issue occurs during the execution of the sys_io_submit system call, where RCU detects a stall on CPU 3. >From the dmesg log, CPU 3 is stuck in the enqueue_hrtimer function (kernel/time/hrtimer.c:1085) while handling an hrtimer interrupt. Meanwhile, the task syz-executor.1 is stuck in memory management functions (e.g., unmap_mapping_pages, mm/memory.c:3849) during sys_io_submit execution. This likely causes the RCU stall. I suspect this is due to delays in hrtimer processing or prolonged blocking in memory management operations. I recommend reviewing the enqueue_hrtimer implementation and the interaction between sys_io_submit, AIO, and the EXT4 filesystem. The full dmesg log is attached. Please feel free to contact me for additional information or reproduction steps. This can be reproduced on: HEAD commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 report: https://pastebin.com/raw/D6PmW878 console output : https://pastebin.com/raw/qeLqJsRF kernel config: https://pastebin.com/raw/zrj9jd1V C reproducer : https://pastebin.com/raw/EprKHENh Best regards, Guoyu