RE: Seg fault from libTree.so from Philippe Canal on 2005-01-13 (RootTalk)

From: Philippe Canal <pcanal_at_fnal.gov>
Date: Thu, 13 Jan 2005 09:18:44 -0600

Hi Phil,

Thanks for reporting this problem it will be fixed shortly in the CVS repository.
As a work around, do not call

root NtpAlign.C
When NtpAlign contains a class named NtpAlign (as opposed to a function). Instead do

> root
root [] .L NtpAlign.C

Cheers,
Philippe.

PS. More details:

There is an issue (which will be fix shortly in the CVS repository) with handling object lifetime when doing:

root NtpAlign.C

When the file NtpAlign contains a class named NtpAlign (as opposed to a function).
In this case a temporary object of type NtpAlign is created. See the output:

(const class NtpAlign)150748920
However it is only deleted __after__ the execution of the first command. Hence __after__

root [1] NtpAlign f
The problem is that in this case f then retrieve a pointer to the open file
(tmp.root) but this file is delete by the deletion of the temporary object.
So When executing

root [2] f.Loop();
It tries to access the now delete file.

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch [mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Philip Symes
Sent: Wednesday, January 12, 2005 4:10 PM To: roottalk_at_pcroot.cern.ch
Subject: [ROOT] Seg fault from libTree.so

Hi ROOTers,
I was trying to do a quick analysis on the file http://minoserv.maps.susx.ac.uk/~symes/calibconsts/tmp.root
(653 KB) so I ran MakeClass() on the file.

When I ran Loop() in a bare ROOT session, it worked fine. I then added a the line
cerr << nb << "\t";
to the loop (with the <iostream> header), but when I ran the Loop() function

again, I got the seg faults (below). When I ran it under GDB, it attributed the problem to libTree.so.

I get the same problem on ROOT 4.01/04 on Scientific Linux 3.0.3 and 4.02/00

on RedHat 9. Do you know what the problem could be?

Cheers,
Phil

I tried this in a bare ROOT session, and using ACLiC and GDB:

[symes_at_minos09 nearmaps]$ root NtpAlign.C

*
W E L C O M E to R O O T *
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Version 4.01/04 19 November 2004 *
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You are welcome to visit our Web site *
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FreeType Engine v2.1.3 used to render TrueType fonts. Compiled for linux with thread support.

CINT/ROOT C/C++ Interpreter version 5.15.156, Oct 20 2004 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0]
Processing NtpAlign.C...
Warning in <TClass::TClass>: no dictionary for class VldContext is available Warning in <TClass::TClass>: no dictionary for class VldTimeStamp is available
Warning in <TClass::TClass>: no dictionary for class NtpAlignmentRecord is available

Warning in <TClass::TClass>: no dictionary for class 
RecRecordImp<RecCandHeader> is available
Warning in <TClass::TClass>: no dictionary for class RecRecord is available
Warning in <TClass::TClass>: no dictionary for class RecCandHeader is

available
Warning in <TClass::TClass>: no dictionary for class RecPhysicsHeader is available
Warning in <TClass::TClass>: no dictionary for class RecDataHeader is available
Warning in <TClass::TClass>: no dictionary for class RecHeader is available Warning in <TClass::TClass>: no dictionary for class NtpAlignTrackStrip is available
Warning in <TClass::TClass>: no dictionary for class NtpAlignCandStrip is available
(const class NtpAlign)150748920

root [1] NtpAlign f
root [2] f.Loop()

Break *** segmentation violation Generating stack trace... 0x0017e7bf in G__call_cppfunc + 0x266 from /opt/root/lib/libCint.so 0x0016de93 in G__interpret_func + 0x6e4 from /opt/root/lib/libCint.so 0x00155a80 in G__getfunction + 0x134f from /opt/root/lib/libCint.so 0x001da4f7 in G__getstructmem + 0x82a from /opt/root/lib/libCint.so 0x001d45dd in G__getvariable + 0x4db from /opt/root/lib/libCint.so 0x0014d00e in G__getitem + 0x5c1 from /opt/root/lib/libCint.so 0x0014bc26 in G__getexpr + 0x783e from /opt/root/lib/libCint.so 0x0013aeee in G__define_var + 0x2d81 from /opt/root/lib/libCint.so 0x001c8f93 in G__defined_type + 0x593 from /opt/root/lib/libCint.so 0x00199b5c in G__exec_statement + 0x18ec from /opt/root/lib/libCint.so 0x0016f5e3 in G__interpret_func + 0x1e34 from /opt/root/lib/libCint.so 0x00155a80 in G__getfunction + 0x134f from /opt/root/lib/libCint.so 0x001da4f7 in G__getstructmem + 0x82a from /opt/root/lib/libCint.so 0x001d45dd in G__getvariable + 0x4db from /opt/root/lib/libCint.so 0x0014d00e in G__getitem + 0x5c1 from /opt/root/lib/libCint.so 0x0014bc26 in G__getexpr + 0x783e from /opt/root/lib/libCint.so 0x00193a0e in G__exec_function + 0x1d5 from /opt/root/lib/libCint.so 0x0019a65b in G__exec_statement + 0x23eb from /opt/root/lib/libCint.so 0x00134c7b in G__exec_tempfile_core + 0x2ce from /opt/root/lib/libCint.so 0x00134e58 in G__exec_tempfile_fp + 0x22 from /opt/root/lib/libCint.so 0x001a28e4 in G__process_cmd + 0x45ed from /opt/root/lib/libCint.so 0x009b1f91 in TCint::ProcessLine(char const*, TInterpreter::EErrorCode*) + 0xa9 from /opt/root/lib/libCore.so 0x00911ed6 in TApplication::ProcessLine(char const*, bool, int*) + 0x670 from /opt/root/lib/libCore.so 0x005cee1d in TRint::HandleTermInput() + 0x1dd from /opt/root/lib/libRint.so 0x005cdc8e in TTermInputHandler::Notify() + 0x24 from /opt/root/lib/libRint.so 0x005cf688 in TTermInputHandler::ReadNotify() + 0x12 from /opt/root/lib/libRint.so 0x00a3b9b7 in TUnixSystem::CheckDescriptors() + 0x143 from /opt/root/lib/libCore.so 0x00a3af97 in TUnixSystem::DispatchOneEvent(bool) + 0x161 from /opt/root/lib/libCore.so 0x00975870 in TSystem::InnerLoop() + 0x18 from /opt/root/lib/libCore.so 0x00975815 in TSystem::Run() + 0x6f from /opt/root/lib/libCore.so 0x00912946 in TApplication::Run(bool) + 0x32 from /opt/root/lib/libCore.so 0x005ce919 in TRint::Run(bool) + 0x327 from /opt/root/lib/libRint.so 0x080488dd in main + 0x71 from /opt/root/bin/root.exe 0x0499b79d in __libc_start_main + 0xed from /lib/tls/libc.so.6 0x080487e1 in _Unwind_Resume + 0x31 from /opt/root/bin/root.exe Root > Function Loop() busy flag cleared

root [3] .q
[symes_at_minos09 nearmaps]$
[symes_at_minos09 nearmaps]$ root NtpAlign.C+

*
W E L C O M E to R O O T *
*
Version 4.01/04 19 November 2004 *
*
You are welcome to visit our Web site *
http://root.cern.ch *
*

FreeType Engine v2.1.3 used to render TrueType fonts. Compiled for linux with thread support.

/home/symes/mytest/nearmaps/./NtpAlign_C.so
In file included from /home/symes/mytest/nearmaps/NtpAlign.C:2,
                 from /home/symes/mytest/nearmaps/fileWHBGrB.h:32,
                 from /home/symes/mytest/nearmaps/fileWHBGrB.cxx:16:
/home/symes/mytest/nearmaps/NtpAlign.h: In member function `virtual Int_t

NtpAlign::Cut(long long int)':
/home/symes/mytest/nearmaps/NtpAlign.h:440: warning: unused parameter `Long64_t

entry'
Warning in <TClass::TClass>: no dictionary for class VldContext is available Warning in <TClass::TClass>: no dictionary for class VldTimeStamp is available
Warning in <TClass::TClass>: no dictionary for class NtpAlignmentRecord is available

Warning in <TClass::TClass>: no dictionary for class 
RecRecordImp<RecCandHeader> is available
Warning in <TClass::TClass>: no dictionary for class RecRecord is available
Warning in <TClass::TClass>: no dictionary for class RecCandHeader is

available
Warning in <TClass::TClass>: no dictionary for class RecPhysicsHeader is available
Warning in <TClass::TClass>: no dictionary for class RecDataHeader is available
Warning in <TClass::TClass>: no dictionary for class RecHeader is available Warning in <TClass::TClass>: no dictionary for class NtpAlignTrackStrip is available
Warning in <TClass::TClass>: no dictionary for class NtpAlignCandStrip is available
(class NtpAlign)179878776

root [1] NtpAlign f
root [2] f.Loop()

Break *** segmentation violation Generating stack trace... 0x01bc0ab8 in <unknown> from /home/symes/mytest/nearmaps/./NtpAlign_C.so 0x00cfe7bf in G__call_cppfunc + 0x266 from /opt/root/lib/libCint.so 0x00cede93 in G__interpret_func + 0x6e4 from /opt/root/lib/libCint.so 0x00cd5a80 in G__getfunction + 0x134f from /opt/root/lib/libCint.so 0x00d5a4f7 in G__getstructmem + 0x82a from /opt/root/lib/libCint.so 0x00d545dd in G__getvariable + 0x4db from /opt/root/lib/libCint.so 0x00ccd00e in G__getitem + 0x5c1 from /opt/root/lib/libCint.so 0x00ccbc26 in G__getexpr + 0x783e from /opt/root/lib/libCint.so 0x00d13a0e in G__exec_function + 0x1d5 from /opt/root/lib/libCint.so 0x00d1a65b in G__exec_statement + 0x23eb from /opt/root/lib/libCint.so 0x00cb4c7b in G__exec_tempfile_core + 0x2ce from /opt/root/lib/libCint.so 0x00cb4e58 in G__exec_tempfile_fp + 0x22 from /opt/root/lib/libCint.so 0x00d228e4 in G__process_cmd + 0x45ed from /opt/root/lib/libCint.so 0x00598f91 in TCint::ProcessLine(char const*, TInterpreter::EErrorCode*) + 0xa9 from /opt/root/lib/libCore.so 0x004f8ed6 in TApplication::ProcessLine(char const*, bool, int*) + 0x670 from /opt/root/lib/libCore.so 0x00c36e1d in TRint::HandleTermInput() + 0x1dd from /opt/root/lib/libRint.so 0x00c35c8e in TTermInputHandler::Notify() + 0x24 from /opt/root/lib/libRint.so 0x00c37688 in TTermInputHandler::ReadNotify() + 0x12 from /opt/root/lib/libRint.so 0x006229b7 in TUnixSystem::CheckDescriptors() + 0x143 from /opt/root/lib/libCore.so 0x00621f97 in TUnixSystem::DispatchOneEvent(bool) + 0x161 from /opt/root/lib/libCore.so 0x0055c870 in TSystem::InnerLoop() + 0x18 from /opt/root/lib/libCore.so 0x0055c815 in TSystem::Run() + 0x6f from /opt/root/lib/libCore.so 0x004f9946 in TApplication::Run(bool) + 0x32 from /opt/root/lib/libCore.so 0x00c36919 in TRint::Run(bool) + 0x327 from /opt/root/lib/libRint.so 0x080488dd in main + 0x71 from /opt/root/bin/root.exe 0x0180479d in __libc_start_main + 0xed from /lib/tls/libc.so.6 0x080487e1 in _Unwind_Resume + 0x31 from /opt/root/bin/root.exe Root > .q [symes_at_minos09 nearmaps]$ [symes_at_minos09 nearmaps]$ gdb root.exe GNU gdb Red Hat Linux (6.1post-1.20040607.17rh) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-redhat-linux-gnu"...(no debugging symbols found)...Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) r NtpAlign.C

Starting program: /home/opt/opt/root/bin/root.exe NtpAlign.C
(no debugging symbols found)...(no debugging symbols found)...(no debugging
symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...[Thread debugging using libthread_db enabled] [New Thread -1218583008 (LWP 9086)]
(no debugging symbols found)...(no debugging symbols found)...(no debugging
symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...Detaching after fork from child process 9089.
(no debugging symbols found)...(no debugging symbols found)...(no debugging
symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...(no debugging symbols found)...

*
W E L C O M E to R O O T *
*
Version 4.01/04 19 November 2004 *
*
You are welcome to visit our Web site *
http://root.cern.ch *
*

FreeType Engine v2.1.3 used to render TrueType fonts. Compiled for linux with thread support.

CINT/ROOT C/C++ Interpreter version 5.15.156, Oct 20 2004 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }.
(no debugging symbols found)...(no debugging symbols found)...(no debugging
symbols found)...root [0]
Processing NtpAlign.C...
Warning in <TClass::TClass>: no dictionary for class VldContext is available Warning in <TClass::TClass>: no dictionary for class VldTimeStamp is available
Warning in <TClass::TClass>: no dictionary for class NtpAlignmentRecord is available

Warning in <TClass::TClass>: no dictionary for class 
RecRecordImp<RecCandHeader> is available
Warning in <TClass::TClass>: no dictionary for class RecRecord is available
Warning in <TClass::TClass>: no dictionary for class RecCandHeader is

available
Warning in <TClass::TClass>: no dictionary for class RecPhysicsHeader is available
Warning in <TClass::TClass>: no dictionary for class RecDataHeader is available
Warning in <TClass::TClass>: no dictionary for class RecHeader is available Warning in <TClass::TClass>: no dictionary for class NtpAlignTrackStrip is available
Warning in <TClass::TClass>: no dictionary for class NtpAlignCandStrip is available
(no debugging symbols found)...(const class NtpAlign)175820336
root [1] NtpAlign f
root [2] f.Loop()

Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1218583008 (LWP 9086)] 0x00f808e2 in G__G__Tree_132_2_5 () from /opt/root/lib/libTree.so
(gdb) where full

#0 0x00f808e2 in G__G__Tree_132_2_5 () from /opt/root/lib/libTree.so No symbol table info available.
#1 0x00ac27bf in G__call_cppfunc () from /opt/root/lib/libCint.so No symbol table info available.
#2 0x00ab1e93 in G__interpret_func () from /opt/root/lib/libCint.so No symbol table info available.
#3 0x00a99a80 in G__getfunction () from /opt/root/lib/libCint.so No symbol table info available.
#4 0x00b1e4f7 in G__getstructmem () from /opt/root/lib/libCint.so No symbol table info available.
#5 0x00b185dd in G__getvariable () from /opt/root/lib/libCint.so No symbol table info available.
#6 0x00a9100e in G__getitem () from /opt/root/lib/libCint.so No symbol table info available.
#7 0x00a8fc26 in G__getexpr () from /opt/root/lib/libCint.so No symbol table info available.
#8 0x00a7eeee in G__define_var () from /opt/root/lib/libCint.so No symbol table info available.
#9 0x00b0cf93 in G__defined_type () from /opt/root/lib/libCint.so No symbol table info available.
#10 0x00addb5c in G__exec_statement () from /opt/root/lib/libCint.so No symbol table info available.
#11 0x00ab35e3 in G__interpret_func () from /opt/root/lib/libCint.so No symbol table info available.
#12 0x00a99a80 in G__getfunction () from /opt/root/lib/libCint.so No symbol table info available.
#13 0x00b1e4f7 in G__getstructmem () from /opt/root/lib/libCint.so No symbol table info available.
#14 0x00b185dd in G__getvariable () from /opt/root/lib/libCint.so No symbol table info available.
#15 0x00a9100e in G__getitem () from /opt/root/lib/libCint.so No symbol table info available.
#16 0x00a8fc26 in G__getexpr () from /opt/root/lib/libCint.so No symbol table info available.
#17 0x00ad7a0e in G__exec_function () from /opt/root/lib/libCint.so No symbol table info available.
#18 0x00ade65b in G__exec_statement () from /opt/root/lib/libCint.so No symbol table info available.
#19 0x00a78c7b in G__exec_tempfile_core () from /opt/root/lib/libCint.so No symbol table info available.
#20 0x00a78e58 in G__exec_tempfile_fp () from /opt/root/lib/libCint.so No symbol table info available.
#21 0x00ae68e4 in G__process_cmd () from /opt/root/lib/libCint.so No symbol table info available.
#22 0x00481f91 in TCint::ProcessLine () from /opt/root/lib/libCore.so No symbol table info available.
#23 0x003e1ed6 in TApplication::ProcessLine () from /opt/root/lib/libCore.so No symbol table info available.
#24 0x002cfe1d in TRint::HandleTermInput () from /opt/root/lib/libRint.so No symbol table info available.
#25 0x002cec8e in TTermInputHandler::Notify () from /opt/root/lib/libRint.so ---Type <return> to continue, or q <return> to quit---q Quit
(gdb) q

The program is running. Exit anyway? (y or n) y [symes_at_minos09 nearmaps]$

-- 
Philip Symes,
MINOS Group,
Fermilab & Sussex University.
http://minoserv.maps.susx.ac.uk/~symes/

Received on Thu Jan 13 2005 - 16:30:28 MET

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