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Re: [PATCH net] vhost_net: don't continue to call the recvmsg when meet errors

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On 2016年11月30日 20:10, Yunjian Wang wrote:
> When we meet an error(err=-EBADFD) recvmsg, the error handling in vhost
> handle_rx() will continue. This will cause a soft CPU lockup in vhost thread.
>
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> ---
>   drivers/vhost/net.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index 5dc128a..edc470b 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -717,6 +717,9 @@ static void handle_rx(struct vhost_net *net)
>   			pr_debug("Discarded rx packet: "
>   				 " len %d, expected %zd\n", err, sock_len);
>   			vhost_discard_vq_desc(vq, headcount);
> +			/* Don't continue to do, when meet errors. */
> +			if (err < 0)
> +				goto out;
>   			continue;
>   		}
>   		/* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */

Acked-by: Jason Wang <jasowang@redhat.com>

We may want to rename vhost_discard_vq_desc() in the future, since it 
does not discard the desc in fact.

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[PATCH net] vhost_net: don't continue to call the recvmsg when meet errors Yunjian Wang <wangyunjian@huawei.com> - 2016-11-30 13:20 +0100
  Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors Jason Wang <jasowang@redhat.com> - 2016-11-30 14:10 +0100
    Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors "Michael S. Tsirkin" <mst@redhat.com> - 2016-11-30 14:50 +0100
  Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors "Michael S. Tsirkin" <mst@redhat.com> - 2016-11-30 14:50 +0100
    RE: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors wangyunjian <wangyunjian@huawei.com> - 2016-12-01 03:50 +0100
      Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors Jason Wang <jasowang@redhat.com> - 2016-12-01 04:20 +0100
      Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors "Michael S. Tsirkin" <mst@redhat.com> - 2016-12-01 04:30 +0100
        Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors Jason Wang <jasowang@redhat.com> - 2016-12-01 04:30 +0100
          Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors Jason Wang <jasowang@redhat.com> - 2016-12-01 04:40 +0100
            RE: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors wangyunjian <wangyunjian@huawei.com> - 2016-12-01 05:50 +0100
              Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors "Michael S. Tsirkin" <mst@redhat.com> - 2016-12-01 06:00 +0100
          Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors "Michael S. Tsirkin" <mst@redhat.com> - 2016-12-01 04:40 +0100
    Re: [PATCH net] vhost_net: don't continue to call the recvmsg when  meet errors Jason Wang <jasowang@redhat.com> - 2016-12-01 04:20 +0100

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