Can't Write the tree

[qinjian_lou]

_ROOT Version:6.20/02
_Platform:CentOS-7-x86_64
_Compiler:gcc 9.2 (I’m not sure but I install root from epel)

In a macro ,when I read a TTree from a TFile small and after some operation I want to write a new tree to a new TFile GS, I get the following wrong

 *** Break *** segmentation violation



===========================================================
There was a crash.
This is the entire stack trace of all threads:
===========================================================
    gdb.printing.register_pretty_printer(gdb.current_objfile(),
    gdb.printing.register_pretty_printer(gdb.current_objfile(),
#0  0x00007fc935be041c in waitpid () from /lib64/libc.so.6
#1  0x00007fc935b5df12 in do_system () from /lib64/libc.so.6
#2  0x00007fc9366bd0cc in TUnixSystem::StackTrace() () from /usr/lib64/root/libCore.so.6.20
#3  0x00007fc9366bfa9c in TUnixSystem::DispatchSignals(ESignals) () from /usr/lib64/root/libCore.so.6.20
#4  <signal handler called>
#5  0x00007fc935ee2be8 in main_arena () from /lib64/libc.so.6
#6  0x00007fc936e7e102 in ?? ()
#7  0x0000000000000000 in ?? ()
===========================================================


The lines below might hint at the cause of the crash.
You may get help by asking at the ROOT forum http://root.cern.ch/forum
Only if you are really convinced it is a bug in ROOT then please submit a
report at http://root.cern.ch/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  0x00007fc935ee2be8 in main_arena () from /lib64/libc.so.6
#6  0x00007fc936e7e102 in ?? ()
#7  0x0000000000000000 in ?? ()
===========================================================

My code about I/O is just as following

#define Digit 10201

//definition
    TFile*small=new TFile("small.root","UPDATE");                                     
    TTree*Gau=new TTree("Gaussian","Gaussian");
    Float_t gau[Digit]={};
    TTree*tree;
    small->GetObject("tree",tree);
 //set branch
    EVENT event;
    tree->SetBranchAddress("m_NpartA",&event.m_NpartA);
    int M=0;
    tree->SetBranchAddress("m_NpartB",&event.m_NpartB);
    tree->SetBranchAddress("m_XA",event.m_XA);
    tree->SetBranchAddress("m_XB",event.m_XB);
    tree->SetBranchAddress("m_YA",event.m_YA);
    tree->SetBranchAddress("m_YB",event.m_YB);                                  
    Gau->Branch("Gaussian",gau,"gau[10201]/F");
//then some operations  with tree and Gau are done
   
   //write the tree
    small->Close();                                                             
    TFile*GS=new TFile("GS.root","RECREATE");
    Gau->Write();
    GS->Close();

In addition, if I remove the

Gau->Write();

Then everything is ok.

[Wile_E_Coyote]

You need:

TFile *GS = TFile::Open("GS.root", "RECREATE");
TTree *Gau = new TTree("Gaussian", "Gaussian"); // resides in "GS"

and then:

GS->cd();
Gau->Write();
delete GS; // automatically deletes "Gau", too