RE: Segmentation violation at TPad::Print("*.gif") for THStack

This now fixed in cvs head. Thanks to have reported it O.C

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-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch
[mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Hajime Nanjo
Sent: Monday, October 03, 2005 10:51 AM
To: roottalk_at_pcroot.cern.ch
Subject: [ROOT] Segmentation violation at TPad::Print("*.gif") for
THStack

Dear ROOTers,

A segmentation vaiolation is occured at
TPad::Print("*.gif") in a batch mode for ROOT v4.04.02.

A script, "hstack.C", includes THStack object and
gPad->Print("hstack.gif").
When it is run from CINT as ".x hstack.C", there is no problem, but when
it is run in batch mode as "root -b hstack.C", a segmentation vaiolation
is occured.
(For the case of ROOT v4.02, it just prints warning message and  give up
creating a gif file.)

Could you please fix to avoid the segmentation violation?

Best Regards,
Hajime
--------------------------------------------

More detailed explanations are described below.
(ROOT version, source code, error messages, behavior in some cases)

=====================================================
1. ROOT version is v4.04.02 in slc3
=====================================================
lxplus016:~$ uname -a
Linux lxplus016.cern.ch 2.4.21-32.0.1.EL.cernsmp #1 SMP Thu May 26
12:29:50 CEST 2005 i686 i686 i386 GNU/Linux lxplus016:~$ gcc -v Reading
specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=i386-redhat-linux Thread model: posix gcc version 3.2.3 20030502
(Red Hat Linux 3.2.3-52) lxplus016:~$ echo $ROOTSYS


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root

lxplus016:~$ 


=====================================================
2. source code
=====================================================


//

{
   THStack *hs = new THStack("hs","test stacked histograms");
   TH1F *h1 = new TH1F("h1","test hstack",100,-4,4);
   h1->FillRandom("gaus",20000);
   h1->SetFillColor(kRed);
   h1->SetMarkerStyle(21);
   h1->SetMarkerColor(kRed);
   hs->Add(h1);
   TH1F *h2 = new TH1F("h2","test hstack",100,-4,4);
   h2->FillRandom("gaus",15000);
   h2->SetFillColor(kBlue);
   h2->SetMarkerStyle(21);
   h2->SetMarkerColor(kBlue);
   hs->Add(h2);
   TH1F *h3 = new TH1F("h3","test hstack",100,-4,4);
   h3->FillRandom("gaus",10000);
   h3->SetFillColor(kGreen);
   h3->SetMarkerStyle(21);
   h3->SetMarkerColor(kGreen);
   hs->Add(h3);
   
   hs->Draw();
   gPad->Print("hstack.gif");
   gPad->Print("hstack.ps");
}

=====================================================
3. error messages
=====================================================
root [0]
Processing hstack.C...
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1

 *** Break *** segmentation violation
 Generating stack trace...
 0x028e1ab3 in TImageDump::DrawPS(int, double*, double*) + 0x513 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libPostscript.so

 0x00f47bc6 in TPad::PaintFillArea(int, double*, double*, char const*) +
0x3f0 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00cc67a2 in TGraph::PaintGrapHist(int, double const*, double const*,
char const*) + 0x122a from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGraf.so

 0x05ca713f in THistPainter::PaintHist(char const*) + 0xce7 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libHistPainter.so

 0x05c9f149 in THistPainter::Paint(char const*) + 0x56f from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libHistPainter.so

 0x00841387 in TH1::Paint(char const*) + 0x5d from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libHist.so

 0x0086f039 in THStack::Paint(char const*) + 0xd7d from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libHist.so

 0x00f460ec in TPad::Paint(char const*) + 0x132 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00f2a767 in TCanvas::Paint(char const*) + 0x2b from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00f4a6b7 in TPad::Print(char const*, char const*) + 0x9a1 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00f4bc85 in TPad::SaveAs(char const*) + 0x50f from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00f49d11 in TPad::Print(char const*) const + 0x15 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00f67def in <unknown> from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libGpad.so

 0x00a96d5f in G__call_cppfunc + 0x2ad from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a86204 in G__interpret_func + 0x70d from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a6db03 in G__getfunction + 0x1334 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00af8f9b in G__getstructmem + 0x82a from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00af22e3 in G__getvariable + 0x4d6 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a64dd0 in G__getitem + 0x4ea from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a64fc6 in G__getitem + 0x6e0 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a63af9 in G__getexpr + 0x7065 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00aadde2 in G__exec_function + 0x1d5 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00ab4aae in G__exec_statement + 0x23eb from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a4cc6b in G__exec_tempfile_core + 0x2ce from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00a4ce75 in G__exec_tempfile + 0x22 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x00abc93b in G__process_cmd + 0x4181 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCint.so

 0x002b1b89 in TCint::ProcessLine(char const*,
TInterpreter::EErrorCode*) + 0xa9 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCore.so

 0x002b1c96 in TCint::ProcessLineSynch(char const*,
TInterpreter::EErrorCode*) + 0x46 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCore.so

 0x0020bd64 in TApplication::ProcessFile(char const*, int*) + 0x8b6 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCore.so

 0x0020b432 in TApplication::ProcessLine(char const*, bool, int*) +
0x5f8 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libCore.so

 0x009ccc47 in TRint::Run(bool) + 0x215 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/lib/libRint.so

 0x080488dd in main + 0x71 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/bin/root.exe

 0x05ae078a in __libc_start_main + 0xda from /lib/tls/libc.so.6
 0x080487e1 in _Unwind_Resume + 0x31 from


/afs/cern.ch/sw/root/v4.04.02/slc3_gcc3.2.3/root/bin/root.exe

Root > 

=====================================================
4. behavior in some cases
=====================================================
case 1 : root [0] .x hstack.C     OK
case 2 : root -b hstack.C         Segmentation violation
case 3 : if only TH1  is used in a script, there is no problem.
for example,


//

{
  TH1F *h1 = new TH1F("h1","test hstack",100,-4,4);
  h1->FillRandom("gaus",20000);
  h1->SetFillColor(kRed);
  h1->SetMarkerStyle(21);
  h1->SetMarkerColor(kRed);
  h1->Draw();
  gPad->Print("hsimple.gif");
  gPad->Print("hsimple.ps");
}