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Wed, 21 Oct 2026 09:45:12 -0700 (PDT) Received: from localhost ([153.61.198.247]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cd6b8645bf7sm265815a12.28.2026.10.21.09.45.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 09:45:11 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Wed, 21 Oct 2026 16:45:10 +0000 Message-Id: Cc: , Subject: Re: [PATCH bpf] bpf, sockmap: use READ_ONCE/WRITE_ONCE for saved_data_ready in the verdict path From: "Alexei Starovoitov" To: "Dudu Lu" , , , In-Reply-To: <20261021155629.68813-1-phx0fer@gmail.com> References: <20261021155629.68813-1-phx0fer@gmail.com> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Wed, Oct 21, 2026 at 08:56 AM Dudu Lu wrote: > sk_psock_stop_strp() uses WRITE_ONCE for the same field. sock_map_link() > / sock_map_unref() touch the same psock from another CPU without the > lock, so KCSAN reports the race: > > BUG: KCSAN: data-race in sock_map_link / sock_map_unref > BUG: KCSAN: data-race in sk_psock_start_verdict / sock_map_unref sashiko is right. KCSAN will print both with this patch applied. pw-bot: cr