shim: set a non-zero return code if the wait process call failed.

Return code is an int32 type, so if an error occurred, the default value
may be zero, this value will be created as a normal exit code.

Set return code to 255 will let the caller(for example Kubernetes) know
that there are some problems with the pod/container.

Fixes: #4419

Signed-off-by: liubin <liubin0329@gmail.com>

src/runtime/pkg/containerd-shim-v2/wait.go

@@ -53,6 +53,11 @@ func wait(ctx context.Context, s *service, c *container, execID string) (int32,
 			"container": c.id,
 			"pid":       processID,
 		}).Error("Wait for process failed")
+
+		// set return code if wait failed
+		if ret == 0 {
+			ret = exitCode255
+		}
 	}
 
 	timeStamp := time.Now()

src/runtime/virtcontainers/sandbox.go

@@ -1590,7 +1590,7 @@ func (s *Sandbox) ResumeContainer(ctx context.Context, containerID string) error
 }
 
 // createContainers registers all containers, create the
-// containers in the guest and starts one shim per container.
+// containers in the guest.
 func (s *Sandbox) createContainers(ctx context.Context) error {
 	span, ctx := katatrace.Trace(ctx, s.Logger(), "createContainers", sandboxTracingTags, map[string]string{"sandbox_id": s.id})
 	defer span.End()