[PATCH] network: Fix a race condition when shutdown & start vm at the same time

Daniel Henrique Barboza danielhb413 at gmail.com
Mon Jun 15 18:36:14 UTC 2020



On 6/11/20 6:58 AM, Bingsong Si wrote:
> when shutdown vm, the qemuProcessStop cleanup virtual interface in two steps:

s/when/When

> 1. qemuProcessKill kill qemu process, and vif disappeared
> 2. ovs-vsctl del-port from the brige
> 
> if start a vm in the middle of the two steps, the new vm will reused the vif,

s/if/If

> but removed from bridge by step 2
> 
> Signed-off-by: Bingsong Si <owen.si at ucloud.cn>
> ---
>   src/qemu/qemu_process.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
> index d36088ba98..706248815a 100644
> --- a/src/qemu/qemu_process.c
> +++ b/src/qemu/qemu_process.c
> @@ -7483,9 +7483,11 @@ void qemuProcessStop(virQEMUDriverPtr driver,
>               if (vport->virtPortType == VIR_NETDEV_VPORT_PROFILE_MIDONET) {
>                   ignore_value(virNetDevMidonetUnbindPort(vport));
>               } else if (vport->virtPortType == VIR_NETDEV_VPORT_PROFILE_OPENVSWITCH) {
> -                ignore_value(virNetDevOpenvswitchRemovePort(
> -                                 virDomainNetGetActualBridgeName(net),
> -                                 net->ifname));
> +                virMacAddr mac;
> +                if (virNetDevGetMAC(net->ifname, &mac) < 0 ||  !virMacAddrCmp(&mac, &net->mac))

Extra space between "||" and "!virMacAddrCmp(.."


With these nits fixed:


Reviewed-by: Daniel Henrique Barboza <danielhb413 at gmail.com>


> +                    ignore_value(virNetDevOpenvswitchRemovePort(
> +                                     virDomainNetGetActualBridgeName(net),
> +                                     net->ifname));
>               }
>           }
>   
> 




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