After upgrade to 1.373 our matrix build stop working. Even creating of a new job did not work. The job executes a shell script on multiple nodes in parallel. Configuration changes are simply lost. A NPE option was thrown :

Caused by: java.lang.NullPointerException
at java.util.ArrayList.<init>(ArrayList.java:133)
at hudson.matrix.Axis.<init>(Axis.java:74)
at hudson.matrix.LabelAxis.<init>(LabelAxis.java:40)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:409)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:355)
at hudson.model.Descriptor.newInstance(Descriptor.java:466)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:743)
at hudson.util.DescribableList.rebuildHetero(DescribableList.java:172)
at hudson.matrix.MatrixProject.submit(MatrixProject.java:561)
at hudson.model.Job.doConfigSubmit(Job.java:1086)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:571)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:259)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:126)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:65)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:79)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)

a roll back to 1.372 fixed the issue.