Re: [dpdk-stable] [PATCH] vhost: fix crash on unregistering in client mode

[Yongseok Koh <yskoh@mellanox.com>]

> On Sep 6, 2018, at 6:18 AM, Qiang Zhou <zhouqiang2633@gmail.com> wrote:
> 
> when rte_vhost_driver_unregister delete the connection fd,
> the fd lock will prevent the vsocket to be freed. But when vhost_user_msg_handler
> return error, it will delete vsocket conn_list. And then the fd lock will become
> invalid. So the vsocket will be freed in rte_vhost_drivere_unregister and the
> vhost_user_read_cb will reconnect.
> 
> To fix this:
> move delete vsocket conn after reconnect

I can't find this patch.
Please use standard "Fixes:" tag. E.g.,

	Fixes: 9c19c83bac54 ("app/testpmd: fix missing jump action in flow action")

> Cc: stable@dpdk.org

Which stable branch are you targeting?
We recommend you to send it with an appropriate prefix. E.g.,

	git send-email --subject-prefix='PATCH 16.11' ...

Please refer to "5.11.1. Backporting patches for Stable Releases"
in the contribution guideline [1]

[1] https://doc.dpdk.org/guides/contributing/patches.html

Thanks,
Yongseok

> Signed-off-by: Qiang Zhou <zhouqiang2633@gmail.com>
> ---
> lib/librte_vhost/socket.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c
> index d63031747..43da1c51b 100644
> --- a/lib/librte_vhost/socket.c
> +++ b/lib/librte_vhost/socket.c
> @@ -293,16 +293,16 @@ vhost_user_read_cb(int connfd, void *dat, int *remove)
> 		if (vsocket->notify_ops->destroy_connection)
> 			vsocket->notify_ops->destroy_connection(conn->vid);
> 
> +		if (vsocket->reconnect) {
> +			create_unix_socket(vsocket);
> +			vhost_user_start_client(vsocket);
> +		}
> +
> 		pthread_mutex_lock(&vsocket->conn_mutex);
> 		TAILQ_REMOVE(&vsocket->conn_list, conn, next);
> 		pthread_mutex_unlock(&vsocket->conn_mutex);
> 
> 		free(conn);
> -
> -		if (vsocket->reconnect) {
> -			create_unix_socket(vsocket);
> -			vhost_user_start_client(vsocket);
> -		}
> 	}
> }
> 
> -- 
> 2.14.3 (Apple Git-98)
>