Compiled program with libNew.so crash

[gabigong]

Description of the bug

In order to use TMapFile I link the application with "-lNew"
For example if test.cpp is the root program to compile I will use

g++  -o test  test.cpp `root-config --new --cflags --glibs`

The program work without any issue with rootn.exe.
Using the compiled program, Immediately it breaks:

*** Break *** segmentation violation
===========================================================
There was a crash.
This is the entire stack trace of all threads:
===========================================================
#0  0x00007f9ece411e8a in waitpid () from /lib64/libc.so.6
#1  0x00007f9ece38d757 in do_system () from /lib64/libc.so.6
#2  0x00007f9ed00a44f5 in TUnixSystem::StackTrace() () from /home/root-6.26.04/builddir/lib/libCore.so
#3  0x00007f9ed00a1cc5 in TUnixSystem::DispatchSignals(ESignals) () from /home/root-6.26.04/builddir/lib/libCore.so
#4  <signal handler called>
#5  0x00007f9ec9b38d5b in TClingCallFunc::SetArg(long) () from /home/root-6.26.04/builddir/lib/libCling.so
#6  0x00007f9ecff6d683 in TApplication::LoadGraphicsLibs() () from /home/root-6.26.04/builddir/lib/libCore.so
#7  0x00007f9ecff6ca2a in TApplication::InitializeGraphics() () from /home/root-6.26.04/builddir/lib/libCore.so
#8  0x00007f9ecff70d89 in TApplication::TApplication(char const*, int*, char**, void*, int) () from /home/root-6.26.04/builddir/lib/libCore.so
#9  0x00000000004011fc 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.
===========================================================
#5  0x00007f9ec9b38d5b in TClingCallFunc::SetArg(long) () from /home/root-6.26.04/builddir/lib/libCling.so
#6  0x00007f9ecff6d683 in TApplication::LoadGraphicsLibs() () from /home/root-6.26.04/builddir/lib/libCore.so
#7  0x00007f9ecff6ca2a in TApplication::InitializeGraphics() () from /home/root-6.26.04/builddir/lib/libCore.so
#8  0x00007f9ecff70d89 in TApplication::TApplication(char const*, int*, char**, void*, int) () from /home/root-6.26.04/builddir/lib/libCore.so
#9  0x00000000004011fc in main ()
===========================================================

Expected behavior

The output messages should be:

Memory mapped file:   hsimple.map
Title:                Memory Mapped Hist
Option:               CREATE
Mapped Memory region: 0xb46a5000 - 0xb46be000 (0.10 MB)
Current breakval:     0xb46b0000
Object               Class                Size      
hpx                  TH1F                 1024

To Reproduce:

The source code test.cpp I am using follows:

// test.cpp
#include "TROOT.h"
#include "TApplication.h"
#include "TH1F.h"
#include "TH2F.h"
#include "TMapFile.h"
#include "TRandom.h"

void hprod();

#ifndef __CINT__ 
 int main(int argc, char **argv)
 {
   TApplication* theApp = new TApplication("Shared Mem - Producer", &argc, argv);
   hprod();
   theApp->Run();
 }
#endif 

void hprod()
{
 TH1F *hpx;
 TH2F *hpxpy;
 TProfile *hprof;
 TMapFile::SetMapAddress(0xb46a5000);
 TMapFile *mfile = TMapFile::Create("hsimple.map","RECREATE", 100000,"Memory Mapped Hist");
 hpx = new TH1F("hpx","This is the px distribution",100,-4,4);
 
 // Print status of mapped file
 mfile->Print();
 
 // Endless loop filling histograms with random numbers
 Float_t px, py, pz;
 int ii = 0;
 while(1)
   {
     gRandom->Rannor(px,py);
     pz = px*px + py*py;
     hpx->Fill(px);
     if (!(ii % 10))
       { 
	 mfile->Update();
	 if (!ii) mfile->ls(); // print contents of mapped file after }
	 ii++;
       }
   }
}

To run mu code: ./test

My setup

1. ROOT version: ROOT 6.26/04
2. Operating system: Fedora 31
3. How you obtained ROOT: I built it myself.

[ferdymercury]

Can you try with a more recent ROOT version? I do not get a crash there.

The problem however persists, even if linking with lNew, it raises an error:

Error in <TMapFile::TMapFile>: no memory mapped file capability available
Use rootn.exe or link application against "-lNew"
Memory mapped file:   hsimple.map
Title:                Memory Mapped Hist
Option:               file closed

[pcanal]

This fixed in v6.32.00 and v6.34.00 (master).