Merge branch 'truthdec_infloop' into 'main'

Fix infinite recursion loop in truth helpers where truthparticle == truthparticle->parent()

See merge request atlas/athena!70131

PhysicsAnalysis/JetTagging/FlavorTagDiscriminants/src/TruthDecoratorHelpers.cxx

@@ -65,6 +65,7 @@ namespace FlavorTagDiscriminants {
             }
             for (unsigned int p = 0; p < truth_particle->nParents(); p++) {
                 const auto parent = truth_particle->parent(p);
+		if(parent == truth_particle) continue;// avoid infinite recursion
                 const auto parent_hadron = get_parent_hadron(parent, false);
                 if ( parent_hadron != nullptr ) {
                     return parent_hadron;
@@ -147,4 +148,4 @@ namespace FlavorTagDiscriminants {
             return seen_vertices.size();
         }
     }
-}
\ No newline at end of file
+}

PhysicsAnalysis/TrackingID/InDetTrackSystematicsTools/Root/InDetTrackTruthOriginTool.cxx

@@ -202,8 +202,10 @@ namespace InDet {
 
     if( flav == 15 && abs(truth->pdgId()) == 15 ) return true;
 
+
     for(unsigned int p=0; p<truth->nParents(); p++) {
       const xAOD::TruthParticle* parent = truth->parent(p);
+      if(parent == truth ) continue ; // avoid infinite recursion
       if( isFrom(parent, flav) ) return true;
     }