Re: [Qemu-devel] [PATCH] rdma: Fix block during rdma migration

["Michael R. Hines" <mrhines@linux.vnet.ibm.com>]

On 03/29/2014 03:39 PM, arei.gonglei@huawei.com wrote:
> From: Mo Yuxiang <Moyuxiang@huawei.com>
>
> If the networking break or there's something wrong with rdma
> device(ib0 with no IP) during rdma migration, the main_loop of
> qemu will be blocked in rdma_destroy_id. I add rdma_ack_cm_event
> to fix this bug.
>
> Signed-off-by: Mo Yuxiang <Moyuxiang@huawei.com>
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>
> ---
>   migration-rdma.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/migration-rdma.c b/migration-rdma.c
> index eeb4302..f60749b 100644
> --- a/migration-rdma.c
> +++ b/migration-rdma.c
> @@ -949,6 +949,7 @@ route:
>           ERROR(errp, "result not equal to event_addr_resolved %s",
>                   rdma_event_str(cm_event->event));
>           perror("rdma_resolve_addr");
> +        rdma_ack_cm_event(cm_event);
>           ret = -EINVAL;
>           goto err_resolve_get_addr;
>       }

Reviewed-by: Michael R. Hines <mrhines@us.ibm.com>

Good catch. =) That's an obvious bug. It looks like I need
to do a much better job of "kill -9" inside the regression
testing scripts - probably i should try killing the migration
prematurely at different periods just to be sure there are
no more places where the connection state is not getting
cleaned up......

- Michael