RE: Crash in LoadTree

From: Philippe Canal <pcanal_at_fnal.gov>
Date: Thu, 28 Jul 2005 14:03:48 -0500

Hi Antonio,

It is hard to tell what actually happened. Most likely an object on the stack or already deleted, is being delete by the TFile (so the culprit is likely to be a TTree or an histogram).

Your best bet is to run you program with valgrind --tool=memcheck (see http://valgrind.kde.org) which should be able to tell which object is the problem.

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch [mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Antonio Sidoti(Roma)
Sent: Thursday, July 28, 2005 11:59 AM
To: roottalk_at_pcroot.cern.ch
Subject: [ROOT] Crash in LoadTree

Hello,
I have a problem looping on a TChain containing two or more root files. My macro is a test macro (not very different from the one obtained from the MakeClass function with just some cout added). Everything is almost OK if I run on a TChain made with just one file. "Almost" because I get a segmentation violation when I quit root (root> .q). If I run on a TChain that contains two or more files I get a segmentation violation while I finish to read the first file. It doesn't seem to me that these root files are corrupted (I can load them, draw variables from TTree, etc...). I attach a piece of log file. I am using root 4.04/02. What should I do to fix that ? I attach also my script code (test.C). Best Regards,
Thanks a lot,
Antonio

(...)
Entry:18937
Loading Tree
PIPPO Load Tree
PIPPO 1  

• Break *** segmentation violation Generating stack trace... 0x005ac0e3 in THashList::Delete(char const*) + 0x35 from
  /usr/local/root/lib/libCore.so
  0x00524e79 in TDirectory::~TDirectory() + 0x55 from
  /usr/local/root/lib/libCore.so
  0x005b23e7 in TObjectTable::Delete(char const*) + 0x27 from
  /usr/local/root/lib/libCore.so
  0x0059fad5 in TCollection::EmptyGarbageCollection() + 0x87 from
  /usr/local/root/lib/libCore.so
  0x0052f489 in TFile::Close(char const*) + 0x37d from
  /usr/local/root/lib/libCore.so
  0x0052e0cc in TFile::~TFile() + 0x3c from /usr/local/root/lib/libCore.so 0x00ff3f6a in TChain::LoadTree(long long) + 0x608 from
  /usr/local/root/lib/libTree.so
  0x04184a77 in lut::LoadTree(long long) + 0xa3 from
  /home/sidoti/atlas/mufast/./test_C.so
  0x04186e10 in lut::FitAll(int, int, int, bool, float, float) + 0x126 from /home/sidoti/atlas/mufast/./test_C.so 0x041889de in <unknown> from /home/sidoti/atlas/mufast/./test_C.so 0x0017fd5f in G__call_cppfunc + 0x2ad from /usr/local/root/lib/libCint.so 0x0016f204 in G__interpret_func + 0x70d from /usr/local/root/lib/libCint.so 0x00156b03 in G__getfunction + 0x1334 from /usr/local/root/lib/libCint.so 0x001e1f9b in G__getstructmem + 0x82a from /usr/local/root/lib/libCint.so 0x001db2e3 in G__getvariable + 0x4d6 from /usr/local/root/lib/libCint.so 0x0014ddd0 in G__getitem + 0x4ea from /usr/local/root/lib/libCint.so 0x0014caf9 in G__getexpr + 0x7065 from /usr/local/root/lib/libCint.so 0x00196de2 in G__exec_function + 0x1d5 from /usr/local/root/lib/libCint.so 0x0019daae in G__exec_statement + 0x23eb from
  /usr/local/root/lib/libCint.so
  0x00135c6b in G__exec_tempfile_core + 0x2ce from
  /usr/local/root/lib/libCint.so
  0x00135e48 in G__exec_tempfile_fp + 0x22 from
  /usr/local/root/lib/libCint.so
  0x001a5daa in G__process_cmd + 0x45f0 from /usr/local/root/lib/libCint.so 0x005b7b89 in TCint::ProcessLine(char const*, TInterpreter::EErrorCode*) + 0xa9 from /usr/local/root/lib/libCore.so 0x005114a5 in TApplication::ProcessLine(char const*, bool, int*) + 0x66b from /usr/local/root/lib/libCore.so 0x003ce2e9 in TRint::HandleTermInput() + 0x1dd from
  /usr/local/root/lib/libRint.so
  0x003cd0ce in TTermInputHandler::Notify() + 0x24 from
  /usr/local/root/lib/libRint.so
  0x003ceb9e in TTermInputHandler::ReadNotify() + 0x12 from
  /usr/local/root/lib/libRint.so
  0x0064b005 in TUnixSystem::CheckDescriptors() + 0x143 from
  /usr/local/root/lib/libCore.so
  0x00649efb in TUnixSystem::DispatchOneEvent(bool) + 0x151 from
  /usr/local/root/lib/libCore.so
  0x00579774 in TSystem::InnerLoop() + 0x18 from
  /usr/local/root/lib/libCore.so
  0x00579719 in TSystem::Run() + 0x6f from /usr/local/root/lib/libCore.so 0x00511f86 in TApplication::Run(bool) + 0x32 from
  /usr/local/root/lib/libCore.so
  0x003cdde4 in TRint::Run(bool) + 0x3b2 from /usr/local/root/lib/libRint.so 0x080488dd in main + 0x71 from /usr/local/root/bin/root.exe 0x055e278a in __libc_start_main + 0xda from /lib/tls/libc.so.6 0x080487e1 in _Unwind_Resume + 0x31 from /usr/local/root/bin/root.exe

cat test.C

#define lut_cxx
#include "test.h"
#define DEBUG

using namespace std;
//#define M_PI 3.14592654

void lut::FitAll(Int_t stphi, Int_t steta, Int_t iadd, Bool_t verb, Float_t muphi, Float_t mueta){
  if (fChain == 0) return;
  Long64_t nentries = fChain->GetEntriesFast();   Int_t nbytes = 0, nb = 0;
  cout << "Total of " << nentries << " entries" << endl;   for (Long64_t jentry=0; jentry<nentries;jentry++) { // 1st loop on events     cout << "Loading Tree" << endl;
    Long64_t ientry = LoadTree(jentry);
    if (ientry < 0) break;
    nb = fChain->GetEntry(jentry); nbytes += nb;     cout << "file Name:" << endl;
    //fChain->GetCurrentFile()->Print();

    cout << "file Name:" << fChain->GetCurrentFile()->GetName() << endl;
    cout << endl;
    cout << "Entry:" << jentry << endl;
    cout << "CICCIO " << fChain->GetTree()->GetEntries() << endl;
  

  cout << "End first loop on events" << endl; } Received on Thu Jul 28 2005 - 21:32:42 MEST