roottest_root_tree_cloning_assertBranchCount fails sporadically

cd /Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/roottest/root/tree/cloning

/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/bin/root.exe -e '#define ClingWorkAroundMissingDynamicScope' -e '#define ClingWorkAroundUnnamedInclude' -e '#define ClingWorkAroundMissingSmartInclude' -e '#define ClingWorkAroundNoDotInclude' -e '#define ClingWorkAroundMissingAutoLoadingForTemplates' -e '#define ClingWorkAroundAutoParseUsingNamespace' -e '#define ClingWorkAroundTClassUpdateDouble32' -e '#define ClingWorkAroundAutoParseDeclaration' -e '#define ClingWorkAroundMissingUnloading' -e '#define ClingWorkAroundBrokenUnnamedReturn' -e '#define ClingWorkAroundUnnamedDetection2' -e 'gSystem->SetBuildDir("/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/roottest/root/tree/cloning",true)' -e 'gSystem->AddDynamicPath("/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/roottest/root/tree/cloning")' -e 'gROOT->SetMacroPath("/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/roottest/root/tree/cloning")' -e 'gSystem->AddIncludePath("-I/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/roottest/root/tree/cloning")' -e 'gSystem->Load("../test/libEvent")' -q -l -b /Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/roottest/root/tree/cloning/assertBranchCount.C

-- BEGIN TEST OUTPUT --

(int) 0

Processing /Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/roottest/root/tree/cloning/assertBranchCount.C...

[/usr/lib/system/libsystem_platform.dylib] _sigtramp (no debug info)

[<unknown binary>] (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCore.so] THashTable::FindObject(char const*) const (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCore.so] TPluginManager::LoadHandlersFromPluginDirs(char const*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCore.so] TPluginManager::FindHandler(char const*, char const*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libRIO.so] TFile::Open(char const*, char const*, char const*, int, int) (no debug info)

[<unknown binary>] (no debug info)

[<unknown binary>] (no debug info)

[<unknown binary>] (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::IncrementalExecutor::executeWrapper(llvm::StringRef, cling::Value*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::Interpreter::RunFunction(clang::FunctionDecl const*, cling::Value*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::Interpreter::EvaluateInternal(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cling::CompilationOptions, cling::Value*, cling::Transaction**, unsigned long) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::MetaSema::actOnxCommand(llvm::StringRef, llvm::StringRef, cling::Value*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::MetaParser::isXCommand(cling::MetaSema::ActionResult&, cling::Value*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::MetaParser::isCommand(cling::MetaSema::ActionResult&, cling::Value*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] cling::MetaProcessor::process(llvm::StringRef, cling::Interpreter::CompilationResult&, cling::Value*, bool) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] HandleInterpreterException(cling::MetaProcessor*, char const*, cling::Interpreter::CompilationResult&, cling::Value*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] TCling::ProcessLine(char const*, TInterpreter::EErrorCode*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCling.so] TCling::ProcessLineSynch(char const*, TInterpreter::EErrorCode*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libCore.so] TApplication::ExecuteFile(char const*, int*, bool) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libRint.so] TRint::ProcessLineNr(char const*, char const*, int*) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/lib/libRint.so] TRint::Run(bool) (no debug info)

[/Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/build/bin/root.exe] main (no debug info)

[/usr/lib/system/libdyld.dylib] start (no debug info)

[<unknown binary>] (no debug info)

-- END TEST OUTPUT --

-- BEGIN TEST ERROR --

 *** Break *** segmentation violation

-- END TEST ERROR --

CMake Error at /Volumes/HD2/build/jenkins/workspace/root-pullrequests-build/root/cmake/modules/RootTestDriver.cmake:179 (message):

  Unexpected error output