diff --git a/common/copr_common/subprocess_live_output.py b/common/copr_common/subprocess_live_output.py
index 5c212e5e9..2b668d37e 100644
--- a/common/copr_common/subprocess_live_output.py
+++ b/common/copr_common/subprocess_live_output.py
@@ -150,8 +150,7 @@ def _kill():
                 return
             self.killed = True
             process.kill()
-            while process.poll():
-                pass
+            assert not process.poll()
             # at least EL7 needs this
             process.stdout.close()
             process.stderr.close()
diff --git a/pylintrc b/pylintrc
index 717d11c85..8a417d76d 100644
--- a/pylintrc
+++ b/pylintrc
@@ -51,7 +51,10 @@ load-plugins=pylint_copr_plugin
 # cyclic-import
 #     Seems like cyclic-import is just a style check which is not going to be
 #     fixed: https://github.com/PyCQA/pylint/issues/6983
-disable=import-error,too-few-public-methods,consider-using-f-string,cyclic-import
+# too-many-instance-attributes
+#     Local variables are often pretty hard to avoid, yet switching to
+#     dataclasses almost never makes sense.
+disable=import-error,too-few-public-methods,consider-using-f-string,cyclic-import,too-many-instance-attributes
 
 [VARIABLES]
 # A regular expression matching names used for dummy variables (i.e. not used).
diff --git a/pylintrc_clients b/pylintrc_clients
index 594f6001d..c10455331 100644
--- a/pylintrc_clients
+++ b/pylintrc_clients
@@ -29,7 +29,10 @@ load-plugins=pylint_copr_plugin
 #     We still support Python 2.7 (EL7) for clients.
 # unspecified-encoding
 #     Python2.7: TypeError: 'encoding' is an invalid keyword argument for this function
-disable=import-error,useless-object-inheritance,super-with-arguments,consider-using-f-string,unspecified-encoding
+# too-many-instance-attributes
+#     Local variables are often pretty hard to avoid, yet switching to
+#     dataclasses almost never makes sense.
+disable=import-error,useless-object-inheritance,super-with-arguments,consider-using-f-string,unspecified-encoding,too-many-instance-attributes
 
 [VARIABLES]
 # A regular expression matching names used for dummy variables (i.e. not used).