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Wed, 08 Jul 2026 11:28:43 -0700 (PDT) From: Serhat Kumral To: yanjun.zhu@linux.dev Cc: dsahern@kernel.org, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, serhatkumral1@gmail.com, syzbot+8c9eede336e3a843750e@syzkaller.appspotmail.com, zyjzyj2000@gmail.com Subject: Re: [PATCH v3] RDMA/rxe: rework per-net tunnel socket lifetime to fix refcount underflow Date: Wed, 8 Jul 2026 21:10:07 +0300 Message-ID: <20260708181007.24280-1-serhatkumral1@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <6ced0145-30ab-4af5-9005-9da024933fff@linux.dev> References: <6ced0145-30ab-4af5-9005-9da024933fff@linux.dev> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Yanjun, > However, after the network namespace teardown, the associated netdevice > is still unregistered, which > triggers the NETDEV_UNREGISTER notifier. In rxe_notify(), this event > eventually calls rxe_net_del() to > remove the RDMA link. Isn't the ordering the other way around? The netdevices of a dying netns are unregistered by default_device_exit_batch(), a pernet device op, while rxe_net_ops is a pernet subsys, and subsys exits run after all device exits. So NETDEV_UNREGISTER (and the notifier's rxe_net_del()) should have already completed before rxe_ns_exit() destroys the mutex. Am I missing a path where rxe_net_del() can run after rxe_ns_exit()? Thanks, Serhat