Re: [PATCH v2 2/2] migration/tls: add error handling in multifd_tls_handshake_thread

[Zheng Chuan]

Reviewed-by: Chuan Zheng <zhengchuan@huawei.com>

On 2021/2/9 18:42, Hao Wang wrote:
> If any error happens during multifd send thread creating (e.g. channel broke
> because new domain is destroyed by the dst), multifd_tls_handshake_thread
> may exit silently, leaving main migration thread hanging (ram_save_setup ->
> multifd_send_sync_main -> qemu_sem_wait(&p->sem_sync)).
> Fix that by adding error handling in multifd_tls_handshake_thread.
> 
> Signed-off-by: Hao Wang <wanghao232@huawei.com>
> ---
>  migration/multifd.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/migration/multifd.c b/migration/multifd.c
> index 2a1ea85ade..03527c564c 100644
> --- a/migration/multifd.c
> +++ b/migration/multifd.c
> @@ -739,7 +739,16 @@ static void multifd_tls_outgoing_handshake(QIOTask *task,
>      } else {
>          trace_multifd_tls_outgoing_handshake_complete(ioc);
>      }
> -    multifd_channel_connect(p, ioc, err);
> +
> +    if (!multifd_channel_connect(p, ioc, err)) {
> +        /*
> +         * Error happen, mark multifd_send_thread status as 'quit' although 
> it
> +         * is not created, and then tell who pay attention to me.
> +         */
> +        p->quit = true;
> +        qemu_sem_post(&multifd_send_state->channels_ready);
> +        qemu_sem_post(&p->sem_sync);
> +    }
>  }
>  
>  static void *multifd_tls_handshake_thread(void *opaque)
> 

-- 
Regards.
Chuan