~/Examples/ROOT_Plot/FinalForGasCoe$ root -l ./MergePlot.C root [0] Processing ./MergePlot.C... *** Break *** segmentation violation =========================================================== There was a crash. This is the entire stack trace of all threads: =========================================================== #0 0x00007fba90eea45a in __GI___wait4 (pid=19875, stat_loc=stat_loc entry=0x7ffe13678818, options=options entry=0, usage=usage entry=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30 #1 0x00007fba90eea41b in __GI___waitpid (pid=, stat_loc=stat_loc entry=0x7ffe13678818, options=options entry=0) at ./posix/waitpid.c:38 #2 0x00007fba90e50bcb in do_system (line=) at ../sysdeps/posix/system.c:171 #3 0x00007fba91912344 in TUnixSystem::StackTrace() () from /home/msb/Music/root-6.26.06/obj/lib/libCore.so #4 0x00007fba9190f655 in TUnixSystem::DispatchSignals(ESignals) () from /home/msb/Music/root-6.26.06/obj/lib/libCore.so #5 #6 0x00007fba7b0e5988 in TMultiGraph::Add(TGraph*, char const*) () from /home/msb/Music/root-6.26.06/obj/lib/libHist.so #7 0x00007fba91b104a4 in ?? () #8 0x0000000000000015 in ?? () #9 0x00005624246ef5d0 in ?? () #10 0x00007fba8ce9ee60 in ?? () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #11 0x00000065ffffffff in ?? () #12 0x0000562426bc0b20 in ?? () #13 0x000000008cec0844 in ?? () #14 0x00007fba91b0f06a in ?? () #15 0x00007fba91b0f06a in ?? () #16 0x0000562426395770 in ?? () #17 0x00007fba91b10580 in ?? () #18 0x00007fba90b55ce0 in ?? () from /home/msb/Music/root-6.26.06/obj/lib/libRIO.so #19 0x00007fba8cf409a2 in cling::runtime::internal::setValueNoAlloc(void*, void*, void*, char) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #20 0x00007ffe1367bc20 in ?? () #21 0x00005624263f47c0 in ?? () #22 0x0000562425cd86f0 in ?? () #23 0x0000562425199cf0 in ?? () #24 0x00007fba8cf1b07e in cling::IncrementalExecutor::executeWrapper(llvm::StringRef, cling::Value*) const () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #25 0x00007fba8cea2de3 in cling::Interpreter::RunFunction(clang::FunctionDecl const*, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #26 0x00007fba8cea3523 in cling::Interpreter::EvaluateInternal(std::__cxx11::basic_string, std::allocator > const&, cling::CompilationOptions, cling::Value*, cling::Transaction**, unsigned long) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #27 0x00007fba8cf7281a in cling::MetaSema::actOnxCommand(llvm::StringRef, llvm::StringRef, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #28 0x00007fba8cf80fd5 in cling::MetaParser::isXCommand(cling::MetaSema::ActionResult&, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #29 0x00007fba8cf82a18 in cling::MetaParser::isCommand(cling::MetaSema::ActionResult&, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #30 0x00007fba8cf6b7b0 in cling::MetaProcessor::process(llvm::StringRef, cling::Interpreter::CompilationResult&, cling::Value*, bool) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #31 0x00007fba8cdb967c in HandleInterpreterException(cling::MetaProcessor*, char const*, cling::Interpreter::CompilationResult&, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #32 0x00007fba8cdd4e46 in TCling::ProcessLine(char const*, TInterpreter::EErrorCode*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #33 0x00007fba8cdd51db in TCling::ProcessLineSynch(char const*, TInterpreter::EErrorCode*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #34 0x00007fba917b2b05 in TApplication::ExecuteFile(char const*, int*, bool) () from /home/msb/Music/root-6.26.06/obj/lib/libCore.so #35 0x00007fba91c022e0 in TRint::ProcessLineNr(char const*, char const*, int*) () from /home/msb/Music/root-6.26.06/obj/lib/libRint.so #36 0x00007fba91c041ec in TRint::Run(bool) () from /home/msb/Music/root-6.26.06/obj/lib/libRint.so #37 0x0000562423bea2f3 in main () =========================================================== The lines below might hint at the cause of the crash. You may get help by asking at the ROOT forum https://root.cern/forum Only if you are really convinced it is a bug in ROOT then please submit a report at https://root.cern/bugs Please post the ENTIRE stack trace from above as an attachment in addition to anything else that might help us fixing this issue. =========================================================== #6 0x00007fba7b0e5988 in TMultiGraph::Add(TGraph*, char const*) () from /home/msb/Music/root-6.26.06/obj/lib/libHist.so #7 0x00007fba91b104a4 in ?? () #8 0x0000000000000015 in ?? () #9 0x00005624246ef5d0 in ?? () #10 0x00007fba8ce9ee60 in ?? () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #11 0x00000065ffffffff in ?? () #12 0x0000562426bc0b20 in ?? () #13 0x000000008cec0844 in ?? () #14 0x00007fba91b0f06a in ?? () #15 0x00007fba91b0f06a in ?? () #16 0x0000562426395770 in ?? () #17 0x00007fba91b10580 in ?? () #18 0x00007fba90b55ce0 in ?? () from /home/msb/Music/root-6.26.06/obj/lib/libRIO.so #19 0x00007fba8cf409a2 in cling::runtime::internal::setValueNoAlloc(void*, void*, void*, char) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #20 0x00007ffe1367bc20 in ?? () #21 0x00005624263f47c0 in ?? () #22 0x0000562425cd86f0 in ?? () #23 0x0000562425199cf0 in ?? () #24 0x00007fba8cf1b07e in cling::IncrementalExecutor::executeWrapper(llvm::StringRef, cling::Value*) const () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #25 0x00007fba8cea2de3 in cling::Interpreter::RunFunction(clang::FunctionDecl const*, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #26 0x00007fba8cea3523 in cling::Interpreter::EvaluateInternal(std::__cxx11::basic_string, std::allocator > const&, cling::CompilationOptions, cling::Value*, cling::Transaction**, unsigned long) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #27 0x00007fba8cf7281a in cling::MetaSema::actOnxCommand(llvm::StringRef, llvm::StringRef, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #28 0x00007fba8cf80fd5 in cling::MetaParser::isXCommand(cling::MetaSema::ActionResult&, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #29 0x00007fba8cf82a18 in cling::MetaParser::isCommand(cling::MetaSema::ActionResult&, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #30 0x00007fba8cf6b7b0 in cling::MetaProcessor::process(llvm::StringRef, cling::Interpreter::CompilationResult&, cling::Value*, bool) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so #31 0x00007fba8cdb967c in HandleInterpreterException(cling::MetaProcessor*, char const*, cling::Interpreter::CompilationResult&, cling::Value*) () from /home/msb/Music/root-6.26.06/obj/lib/libCling.so ===========================================================