Merge branch 'master' into develop

Author: vkarak

docs/manpage.rst

@@ -1365,6 +1365,13 @@ Since the report file information is now kept in the results database, there is
 You can disable the report generation by turning off the :attr:`~config.general.generate_file_reports` configuration parameter.
 The file report of any session can be retrieved from the database with the :option:`--describe-stored-sessions` option.
 
+.. warning::
+
+    ReFrame uses file locking to coordinate storing of run session data in the database file.
+    Enabling the database storage on filesystems that do not support locking (e.g some networked filesystems) might lead to hangs at the end of a run session.
+    For this reason, you must make sure that the database file is located on a filesystem that supports locking.
+    You can set the database location through the :attr:`~config.storage.sqlite_db_file` configuration setting or the :envvar:`RFM_SQLITE_DB_FILE` environment variable.
+
 
 .. _querying-past-results:
 

reframe/frontend/printer.py

@@ -195,6 +195,9 @@ def failure_stats(self, report, global_stats=False):
                 info += f' @{tc["system"]}:{tc["partition"]}+{tc["environ"]}'
 
                 failed_stage = tc['fail_phase']
+                if not failed_stage:
+                    continue
+
                 failures.setdefault(failed_stage, [])
                 failures[failed_stage].append(info)