> -----Original Message-----
> From: Maxime Coquelin <maxime.coque...@redhat.com>
> Sent: Monday, July 26, 2021 3:58 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo....@intel.com>; Wang, Yinan
> <yinan.w...@intel.com>; Ling, WeiX <weix.l...@intel.com>
> Cc: Maxime Coquelin <maxime.coque...@redhat.com>; sta...@dpdk.org
> Subject: [PATCH] vhost: fix crash on reconnect
>
> When the vhost-user frontend like Virtio-user tries to
> reconnect to the restarted Vhost backend, the Vhost backend
> segfaults when multiqueue is enabled.
>
> This is caused by VHOST_USER_GET_VRING_BASE being called for
> a virtqueue that has not been created before, causing a NULL
> pointer dereferencing.
>
> This patch adds the VHOST_USER_GET_VRING_BASE requests to
> the list of requests that trigger queue pair allocations.
>
> Fixes: 160cbc815b41 ("vhost: remove a hack on queue allocation")
> Cc: sta...@dpdk.org
>
> Reported-by: Yinan Wang <yinan.w...@intel.com>
> Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
> ---
> lib/vhost/vhost_user.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
> index 433f412fa8..29a4c9af60 100644
> --- a/lib/vhost/vhost_user.c
> +++ b/lib/vhost/vhost_user.c
> @@ -2796,6 +2796,7 @@ vhost_user_check_and_alloc_queue_pair(struct virtio_net
> *dev,
> break;
> case VHOST_USER_SET_VRING_NUM:
> case VHOST_USER_SET_VRING_BASE:
> + case VHOST_USER_GET_VRING_BASE:
> case VHOST_USER_SET_VRING_ENABLE:
> vring_idx = msg->payload.state.index;
> break;
> --
> 2.31.1
Reviewed-by: Chenbo Xia <chenbo....@intel.com>
