Fix executions hangs on finalisation exception (#5070)

Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>

modules/nextflow/src/main/groovy/nextflow/processor/TaskPollingMonitor.groovy

@@ -663,14 +663,24 @@ class TaskPollingMonitor implements TaskMonitor {
 
  // finalize the task asynchronously
  if( enableAsyncFinalizer ) {
- finalizerPool.submit( ()-> finalizeTask(handler) )
+ finalizerPool.submit( ()-> safeFinalizeTask(handler) )
  }
  else {
  finalizeTask(handler)
  }
  }
  }
 
+ protected void safeFinalizeTask(TaskHandler handler) {
+ try {
+ finalizeTask(handler)
+ }
+ catch (Throwable t) {
+ log.error "Unexpected error while finalizing task '${handler.task.name}' - cause: ${t.message}"
+ session.abort(t)
+ }
+ }
+
  protected void finalizeTask( TaskHandler handler ) {
  // finalize the task execution
  final fault = handler.task.processor.finalizeTask(handler.task)