diff --git a/Makefile.am b/Makefile.am
index 65dfe9d..5b60c5f 100755
--- a/Makefile.am
+++ b/Makefile.am
@@ -44,7 +44,11 @@
 
 # TODO: generate --server and --client switches from "--with(out)-..." build flags
 cross: precross
-	python test/test.py -s
+	$(PYTHON) test/test.py -s
+
+fail: precross
+	$(PYTHON) test/test.py
+	$(PYTHON) test/test.py --update-expected-failures=overwrite
 
 codespell_skip_files = \
 	*.jar \
diff --git a/test/README.md b/test/README.md
index ef874ac..91e4c26 100755
--- a/test/README.md
+++ b/test/README.md
@@ -101,6 +101,10 @@
     test/test.py --skip-known-failures
     test/test.py --update-expected-failures=merge
 
+to update the known failures, run
+
+    make fail
+
 ## Test executable specification
 
 ### Command line parameters
diff --git a/test/known_failures_Linux.json b/test/known_failures_Linux.json
index a83c111..6ed201b 100644
--- a/test/known_failures_Linux.json
+++ b/test/known_failures_Linux.json
@@ -1,21 +1,11 @@
 [
-  "c_glib-c_glib_binary_buffered-ip",
-  "c_glib-c_glib_binary_framed-ip",
-  "c_glib-cpp_binary_buffered-ip",
-  "c_glib-cpp_binary_framed-ip",
   "c_glib-csharp_binary_buffered-ip",
   "c_glib-csharp_binary_framed-ip",
   "c_glib-go_binary_buffered-ip",
   "c_glib-go_binary_framed-ip",
-  "c_glib-hs_binary_buffered-ip",
   "c_glib-hs_binary_framed-ip",
-  "c_glib-java_binary_buffered-ip",
-  "c_glib-java_binary_framed-fastframed-ip",
-  "c_glib-java_binary_framed-ip",
   "c_glib-nodejs_binary_buffered-ip",
   "c_glib-nodejs_binary_framed-ip",
-  "c_glib-perl_binary_buffered-ip",
-  "c_glib-php_binary_buffered-ip",
   "c_glib-php_binary_framed-ip",
   "c_glib-py_binary-accel_buffered-ip",
   "c_glib-py_binary-accel_framed-ip",
@@ -27,7 +17,6 @@
   "c_glib-rb_binary_framed-ip",
   "cpp-cpp_binary_http-domain",
   "cpp-cpp_binary_http-ip",
-  "cpp-cpp_compact_http-domain",
   "cpp-cpp_compact_http-ip",
   "cpp-cpp_json_http-domain",
   "cpp-cpp_json_http-ip",
@@ -76,8 +65,6 @@
   "cpp-java_compact_http-ip-ssl",
   "cpp-java_json_http-ip",
   "cpp-java_json_http-ip-ssl",
-  "cpp-nodejs_json_buffered-ip",
-  "cpp-nodejs_json_buffered-ip-ssl",
   "cpp-php_binary_framed-ip",
   "cpp-rb_binary-accel_buffered-ip",
   "cpp-rb_binary-accel_framed-ip",
@@ -439,12 +426,7 @@
   "nodejs-hs_json_framed-ip",
   "nodejs-hs_json_framed-ip-ssl",
   "nodejs-java_json_buffered-ip-ssl",
-  "nodejs-nodejs_json_buffered-ip-ssl",
   "nodejs-php_binary_framed-ip",
-  "nodejs-py_compact_buffered-ip",
-  "nodejs-py_compact_buffered-ip-ssl",
-  "nodejs-py_compact_framed-ip",
-  "nodejs-py_compact_framed-ip-ssl",
   "nodejs-py_json_buffered-ip",
   "nodejs-py_json_buffered-ip-ssl",
   "nodejs-py_json_framed-ip",