availability-recovery: move cpu burners in blocking tasks

node/core/approval-voting/src/lib.rs

@@ -2519,6 +2519,17 @@ async fn launch_approval<Context>(
 						// do nothing. we'll just be a no-show and that'll cause others to rise up.
 						metrics_guard.take().on_approval_unavailable();
 					},
+					&RecoveryError::ChannelClosed => {
+						gum::warn!(
+							target: LOG_TARGET,
+							?para_id,
+							?candidate_hash,
+							"Channel closed while recovering data for candidate {:?}",
+							(candidate_hash, candidate.descriptor.para_id),
+						);
+						// do nothing. we'll just be a no-show and that'll cause others to rise up.
+						metrics_guard.take().on_approval_unavailable();
+					},
 					&RecoveryError::Invalid => {
 						gum::warn!(
 							target: LOG_TARGET,

node/core/dispute-coordinator/src/participation/mod.rs

@@ -319,7 +319,7 @@ async fn participate(
 			send_result(&mut result_sender, req, ParticipationOutcome::Invalid).await;
 			return
 		},
-		Ok(Err(RecoveryError::Unavailable)) => {
+		Ok(Err(RecoveryError::Unavailable)) | Ok(Err(RecoveryError::ChannelClosed)) => {
 			send_result(&mut result_sender, req, ParticipationOutcome::Unavailable).await;
 			return
 		},