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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <20200114185357.25819-1-maxime.coquelin@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: EaZGCI-uMtuwnWwd3RbGtw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-stable] [PATCH] vhost: fix deadlock on port deletion X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" On 1/14/20 7:53 PM, Maxime Coquelin wrote: > If the vhost-user application (e.g. OVS) deletes the vhost-user > port while Qemu sends a vhost-user request, a deadlock can > happen if the request handler tries to acquire vhost-user's > global mutex, which is also locked by the vhost-user port > deletion API (rte_vhost_driver_unregister). > > This patch prevents the deadlock by making > rte_vhost_driver_unregister() to release the mutex and try > again if a request is being handled to give a chance to > the request handler to complete. > > Fixes: 8b4b949144b8 ("vhost: fix dead lock on closing in server mode") > Fixes: 5fbb3941da9f ("vhost: introduce driver features related APIs") > Cc: stable@dpdk.org > > Signed-off-by: Maxime Coquelin > --- > lib/librte_vhost/socket.c | 20 +++++++++++++++----- > 1 file changed, 15 insertions(+), 5 deletions(-) Applied to dpdk-next-virtio/master Thanks to the reviewers, Maxime