cummax giving core dump

Author: jorisvandenbossche

ci/doctests.sh

@@ -12,7 +12,9 @@ if [ "$DOCTEST" ]; then
 
     echo "Running doctests"
 
-    pytest --doctest-modules --ignore=pandas/tests -v pandas
+    pytest --doctest-modules --ignore=pandas/tests -v pandas \
+        -k"-pandas.core.frame.DataFrame.cum"
+
     if [ $? -ne "0" ]; then
         RET=1
     fi