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Tue, 27 Oct 2026 00:10:04 -0700 (PDT) Received: from kernel.tail6741c6.ts.net ([185.220.238.37]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cd8ccc21274sm2277512a12.8.2026.10.27.00.09.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2026 00:10:03 -0700 (PDT) From: Kunwu Chan To: jiangshanlai@gmail.com, paulmck@kernel.org, josh@joshtriplett.org, work@onurozkan.dev, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, boqun@kernel.org, urezki@gmail.com Cc: rostedt@goodmis.org, mathieu.desnoyers@efficios.com, qiang.zhang@linux.dev, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, Kunwu Chan , Kunwu Chan Subject: [PATCH v2 01/10] srcu: Record callback registration stack for KASAN Date: Tue, 27 Oct 2026 15:09:14 +0800 Message-ID: <20261027070923.3054462-2-kunwu.chan@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261027070923.3054462-1-kunwu.chan@gmail.com> References: <20261027070923.3054462-1-kunwu.chan@gmail.com> X-Mailing-List: rcu@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Record the callback registration stack in __call_srcu() for KASAN diagnostics involving SRCU callbacks. Suggested-by: Zqiang Signed-off-by: Kunwu Chan --- kernel/rcu/srcutree.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index 2b0e2b2d2c18..46fe2f0cef85 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -1530,6 +1531,10 @@ static void __call_srcu(struct srcu_struct *ssp, struct rcu_head *rhp, { if (WARN_ON_ONCE(ssp->srcu_reader_flavor == SRCU_READ_FLAVOR_ATOMIC)) return; // Leak the callback rather than corrupt SRCU state. + + /* Record the caller: the irq_work's stack says nothing about it. */ + kasan_record_aux_stack(rhp); + if (should_rcu_defer()) { struct srcu_defer *sndp = this_cpu_ptr(&srcu_defer); struct srcu_data *sdp; -- 2.43.0