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X-CSE-ConnectionGUID: 2lKZUBoTSTGujvpONsZoiw== X-CSE-MsgGUID: IR1q2HJ8TGe4uW7dRbgrEg== X-IronPort-AV: E=McAfee;i="6700,10204,11441"; a="72613252" X-IronPort-AV: E=Sophos;i="6.15,309,1739865600"; d="scan'208";a="72613252" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 May 2025 10:34:33 -0700 X-CSE-ConnectionGUID: //fP7w3GSM6zYYqb9pbf+A== X-CSE-MsgGUID: gONBF+j/RM2sHBgWIZf6zQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,309,1739865600"; d="scan'208";a="142249791" Received: from msatwood-mobl.amr.corp.intel.com (HELO [10.125.109.147]) ([10.125.109.147]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 May 2025 10:34:32 -0700 Message-ID: <0b864cd0-e763-4266-a80a-cfa69ad60ee1@intel.com> Date: Fri, 23 May 2025 10:34:31 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] RCU Detected Stall in sys_process_vm_writev To: Guoyu Yin , akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com References: Content-Language: en-US From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 39C7214000E X-Rspamd-Server: rspam09 X-Stat-Signature: manngmi13g8jh15az61dbew8j7jygysu X-HE-Tag: 1748021674-959816 X-HE-Meta: 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 icTnazUO HNDN400sVZFN4eRzLe6vqPom2n3Q5n1hU5UYUDmQVFUsVXAjLx07rthmI8zlOMtlO8lOyACzn7MgupIfH1UPCXO5Hj93lvMvpZVBybuqB1DqyqEZwuIhmJohOw1O0UIfz5EbgSeqGt6ddArZjX5BGNB8Rv6yMQ8NeK9i6I3smcWZZM7ZyUVhq0gc2R5ODJEoNtiaPAyTVXf7TwPhYgRojpf35RMcgmVhUsrx0IKjz3ZBmZkN5RaEndrf285T/2KscKwCr7EPURa6lL80n9Ki4G3pWEA== 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 5/18/25 22:19, Guoyu Yin wrote: > I discovered a kernel crash using the Syzkaller framework, described > as "INFO: rcu detected stall in sys_process_vm_writev". This issue > occurs during the execution of the sys_process_vm_writev system call, > where RCU detects a stall on CPU 0. Guoyu, Could you tell us a little more about the overall environment here? It seems like you're running syzkaller and just reporting whenever you see a splat. Is that about right? Could you tell us a little more about why you are doing this? What is your goal? I think Steve's advice he gave to en eerily similar report applies to this one as well: https://lore.kernel.org/all/20250521133137.1b2f2cac@gandalf.local.home/ Feel free to _run_ with KASAN enabled, but please don't report issues unless you can reproduce without KASAN. Unless it's an actual KASAN error report, of course. But, in general syzkaller produces a ton of noise. Unless you have a reproducer or a _clear_ bug, I'm not sure it's very worth sending these reports. There's honestly not much we can do with them.