[ROOT] segv in TChain::LoadTree

From: Colin Bernet (Colin.Bernet@cern.ch)
Date: Sat Apr 05 2003 - 13:14:39 MEST 

Hi rooters !

I have a piece of code that is working with root 3.03/9 but that gives a 
segv with  3.05/03.

this occurs when I call chain.LoadTree(0) :


(gdb) p i
$1 = 0
(gdb) l
191         // this is a chain
192         
193         // chain->SetNotify(this);
194         
195         int i=0;
196         while( chain->LoadTree(i++) != -2) { // <=== here !
197           TFile *file = chain->GetFile();
198           if(file) {
199             fDfm = (DetFileManager*)file->Get("DetFileManager");
200             if(fDfm) {
(gdb) n

Program received signal SIGSEGV, Segmentation fault.
0x4143e540 in TSelectorDraw::Notify ()
   from 
/afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTreePlayer.so
(gdb) bt
#0  0x4143e540 in TSelectorDraw::Notify ()
   from 
/afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTreePlayer.so
#1  0x4145dfe1 in TTreePlayer::UpdateFormulaLeaves ()
   from 
/afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTreePlayer.so
#2  0x40d72351 in TChain::LoadTree ()
   from /afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTree.so
#3  0x08067146 in MyEfficiency::CreateDetectors (this=0x8888040)
    at MyEfficiency.cc:196
#4  0x080666d7 in MyEfficiency::Begin (this=0x8888040, tree=0x86cec58)
    at MyEfficiency.cc:78
#5  0x4145b48b in TTreePlayer::Process ()
   from 
/afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTreePlayer.so
#6  0x40d87065 in TTree::Process ()
   from /afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTree.so
#7  0x40d72f14 in TChain::Process ()
   from /afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root/lib/libTree.so
#8  0x08076cfa in main () at Debug.cc:13
#9  0x42017589 in __libc_start_main () from /lib/i686/libc.so.6


I'm using /afs/cern.ch/sw/root/v3.05.03/rh73_gcc2953/root, so I would like 
to avoid downloading root and compiling in debug mode to find out what 
happens. 

Maybe somebody knows how I can solve this problem ?

have a nice week-end, 
Colin

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