Merge pull request #28802 from Fedespring/from-CMSSW_11_1_X_2020-01-2…

…7-1100 bug-fix for infinite loop in MuonSimClassifier.cc
cms-sw · Feb 3, 2020 · e4c6faa · e4c6faa
2 parents 60e4c46 + 52c69d7
commit e4c6faa
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/SimMuon/MCTruth/plugins/MuonSimClassifier.cc b/SimMuon/MCTruth/plugins/MuonSimClassifier.cc
@@ -320,7 +320,11 @@ void MuonSimClassifier::produce(edm::Event &iEvent, const edm::EventSetup &iSetu
               jm++;
               if (mMom->numberOfMothers() > 0) {
                 mMom = mMom->motherRef();
+              } else {
+                LogTrace("MuonSimClassifier") << "\t No Mother is found ";
+                break;
               }
+
               LogTrace("MuonSimClassifier") << "\t\t backtracking mother " << jm << ", pdgId = " << mMom->pdgId()
                                             << ", status= " << mMom->status();
             }