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Cota" , peterx@redhat.com Subject: [PATCH 3/3] rcu: Avoid double rcu frees Date: Mon, 29 Sep 2025 15:08:01 -0400 Message-ID: <20250929190801.931989-4-peterx@redhat.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250929190801.931989-1-peterx@redhat.com> References: <20250929190801.931989-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.513, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1759172931057116600 Content-Type: text/plain; charset="utf-8" Trap call_rcu1() to make sure it won't be invoked twice for one rcu head. Suggested-by: Peter Maydell Signed-off-by: Peter Xu --- util/rcu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/util/rcu.c b/util/rcu.c index b703c86f15..9272fe5796 100644 --- a/util/rcu.c +++ b/util/rcu.c @@ -307,6 +307,8 @@ static void *call_rcu_thread(void *opaque) =20 void call_rcu1(struct rcu_head *node, void (*func)(struct rcu_head *node)) { + /* Avoid double rcu frees */ + assert(node->func =3D=3D NULL); node->func =3D func; enqueue(node); qatomic_inc(&rcu_call_count); --=20 2.50.1