Re: Crash at tree->GetEvent(non_first_event)

Stanislav Terechtchenko (Stanislav.Terechtchenko@cern.ch)
Tue, 15 Jun 1999 17:16:55 +0200 (MET DST)

Hi Rooters.
My program uses root file with a great enough number of histograms in
the deep enough directory structure and several branches. It craches in
TFile::Close(). It looks like filling histograms and branches is correct.
Backtrace of debugger shows that segmentation violation is occured
somewhere deeply inside ROOT. Very naive question but how can simple
user's code cause such effect? What can be wrong?

Thank you.

here is a fragment of code where the crach occured
/////////////

fprintf(stderr,"Closing...\n");
gRootFile->Close();
fprintf(stderr,"OK\n");

////////////
here is output and backtrace of gdb:

Closing...

Program received signal SIGSEGV, Segmentation fault.
0xef3d2760 in __0fFTListKFindObjectP6HTObjectK ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
(gdb) bt
#0 0xef3d2760 in __0fFTListKFindObjectP6HTObjectK ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
#1 0xef3cfc58 in __0fJTHashListGRemoveP6HTObject ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
#2 0xeefd3e3c in __0oDTH1dtv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libHist.so
#3 0xeeff196c in __0oETH1Fdtv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libHist.so
#4 0xef3d2630 in __0fFTListGDeletePCc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
#5 0xef3cfb84 in __0fJTHashListGDeletePCc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
#6 0xef642eb4 in __0oKTDirectorydtv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libBase.so
#7 0xef3d2630 in __0fFTListGDeletePCc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
#8 0xef3cfb84 in __0fJTHashListGDeletePCc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
#9 0xef642eb4 in __0oKTDirectorydtv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libBase.so
#10 0xef6d1824 in __0fMTObjectTableGDeletePCc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libBase.so
#11 0xef3a20a4 in __0fLTCollectionWEmptyGarbageCollectionvT ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libCont.so
/////// here is function from my code which invokes TFIle::Close() and
where is TFile::Close() ??????
#12 0x1bbe4 in __0fDTRcOProcessMessagelNCB ()
#13 0xeea64e88 in __0fHTGFrameTHandleClientMessageP6HEvent_t ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libGui.so
#14 0xeea66b8c in __0fLTGMainFrameTHandleClientMessageP6HEvent_t ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libGui.so
#15 0xeea64be8 in __0fHTGFrameLHandleEventP6HEvent_t ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libGui.so
#16 0xeea5883c in __0fITGClientLHandleEventP6HEvent_t ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libGui.so
#17 0xeea585d0 in __0fITGClientPProcessOneEventv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libGui.so
#18 0xeea58664 in __0fITGClientLHandleInputv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libGui.so
#19 0xeed5fd7c in __0fLTUnixSystemQDispatchOneEventUc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libUnix.so
#20 0xef6de508 in __0fHTSystemJInnerLoopv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libBase.so
#21 0xef6de47c in __0fHTSystemDRunv ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libBase.so
#22 0xee7e7610 in __0fFTRintDRunUc ()
from /afs/cern.ch/na49/library.4/ROOT/pro/sun4m_53/root/lib/libRint.so
#23 0x1a8f4 in main ()

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Stanislav Tereshenko
Institute for High Energy Physics Protvino, Russia
Multi-Muon Spectrometer Department
e-mail: tereshenko_at_mx.ihep.su
sutasu@oea.ihep.su

CERN, European Laboratory for Particle Physics, Geneve, Switzerland
CMS experiment
e-mail: Stanislav.Terechtchenko@cern.ch
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