CINT crashes when reading 2 objects with identical key from 2 different files

From: Thiemo Nagel <thiemo.nagel_at_tum.de>
Date: Wed, 30 Nov 2011 18:18:20 +0100


Dear ROOTers,

I'd kindly ask for your help with some crashes that I'm observing with some of my code running with ROOT 5.30.03. I guess that the problem is on my side, but I can't figure out what is wrong.

Starting point: I'm storing the output of my analysis in a customized "Selector" class which inherits from "MySelector" which inherits from TSelector. To determine some physical quantities, I'd like to divide the output of two analysis runs, which means that I'm trying to read two Selector objects from two different .root files. But this is already causing crashes. (I've tested that both selectors work well, when the files are opened individually. It's just when both are accessed in the same script that the problem occurs.)

testpol.C is a minimal script which triggers my problem. prepareSelectors.C must be called beforehand in order to load all classes into CINT. (For some reason, interpreting the class fails.) I've also attached MySelector.h and Selector.h, in case that might be useful for diagnosis.

Any help would be greatly appreciated!

Cheers,
Thiemo

P.S.: Below is the output of one of the crashes:

[0] mnemosyne:~/analysis/selector> root -n prepareSelectors.C testpol.C root [0]
Processing prepareSelectors.C... 

0.177548 s
0.215103 s
0.243131 s
0.269481 s
0.295701 s
0.323266 s
0.35179 s
0.379835 s
0.408063 s
0.449982 s
Processing testpol.C...
TFile**         murd.root
  TFile*         murd.root

   KEY: Selector Selector;1
got Selector: 'murd' 
TFile**         mumc.root
  TFile*         mumc.root

   KEY: Selector Selector;1
There was a crash.
This is the entire stack trace of all threads:

#0 0xb7779424 in __kernel_vsyscall ()
#1 0xb65c9003 in __waitpid_nocancel ()

     at ../sysdeps/unix/syscall-template.S:82
#2 0xb656ae63 in do_system (line=<value optimized out>)

     at ../sysdeps/posix/system.c:149
#3 0xb66863bd in system (

     line=0xb909630 "/usr/local/root/root_v5.30.03/etc/gdb-backtrace.sh 3137 1>&2") at pt-system.c:29
#4 0xb72203cd in TUnixSystem::Exec(char const*) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#5 0xb722716b in TUnixSystem::StackTrace() ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#6 0xb72259af in TUnixSystem::DispatchSignals(ESignals) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#7 0xb7225abd in ?? () from

/usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#8 0xb721cdc2 in ?? () from

/usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#9 0xb724bffd in textinput::TerminalConfigUnix::HandleSignal(int) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#10 0xb724c3d6 in ?? () from

/usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#11 <signal handler called>
#12 0xb5a46c1d in ?? () from

/usr/local/root/root_v5.30.03/lib/libHist.so.5.30
#13 0xb71e9c90 in TClass::Destructor(void*, bool) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#14 0xb626a2d9 in TBufferFile::ReadFastArray(void**, TClass const*, int,
bool, TMemberStreamer*, TClass const*) ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#15 0xb632b687 in int TStreamerInfo::ReadBuffer<char**>(TBuffer&, char**
const&, int, int, int, int) () from
/usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#16 0xb62ae1a9 in TStreamerInfoActions::GenericAction(TBuffer&, void*,
TStreamerInfoActions::TConfiguration const*) ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#17 0xb626439c in

TBufferFile::ReadSequence(TStreamerInfoActions::TActionSequence const&, void*) () from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#18 0xb626486b in TBufferFile::ReadClassBuffer(TClass const*, void*,
TClass const*) () from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#19 0xb44d674e in Selector::Streamer(TBuffer&) ()

    from /tmp/tnagel/aclic_builddir/Selector_cc.so
#20 0xb62a1afb in TKey::ReadObj() ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#21 0xb62751f1 in TDirectoryFile::Get(char const*) ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#22 0xb727159e in ?? () from

/usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#23 0xb6a7f0f7 in Cint::G__ExceptionWrapper(int (*)(G__value*, char
const*, G__param*, int), G__value*, char*, G__param*, int) ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#24 0xb6b2e4cf in G__execute_call ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#25 0xb6b2f36a in G__call_cppfunc ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#26 0xb6b09991 in G__interpret_func ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#27 0xb6af61ec in G__getfunction ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#28 0xb6bf6524 in G__getstructmem(int, G__FastAllocString&, char*, int,
char*, int*, G__var_array*, int) ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#29 0xb6beafc5 in G__getvariable ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#30 0xb6acfc18 in G__getitem ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#31 0xb6ad51ac in G__getexpr ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#32 0xb6af5694 in G__getfunction ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#33 0xb6ad028b in G__getitem ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#34 0xb6ad51ac in G__getexpr ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#35 0xb6af6a6f in G__getfunction ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#36 0xb6ad028b in G__getitem ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#37 0xb6ad51ac in G__getexpr ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#38 0xb6abf235 in G__define_var ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#39 0xb6b5bc9c in G__exec_statement ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#40 0xb6b0ac7e in G__interpret_func ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#41 0xb6af6251 in G__getfunction ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#42 0xb6ad028b in G__getitem ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#43 0xb6ad51ac in G__getexpr ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#44 0xb6adfe28 in G__calc_internal ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#45 0xb6b6e629 in G__process_cmd ()

    from /usr/local/root/root_v5.30.03/lib/libCint.so.5.30
#46 0xb71de75b in TCint::ProcessLine(char const*,
TInterpreter::EErrorCode*) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#47 0xb71dc111 in TCint::ProcessLineSynch(char const*,
TInterpreter::EErrorCode*) () from
/usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#48 0xb71253bc in TApplication::ExecuteFile(char const*, int*, bool) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#49 0xb71256dc in TApplication::ProcessFile(char const*, int*, bool) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#50 0xb7122ae8 in TApplication::ProcessLine(char const*, bool, int*) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#51 0xb68069ca in TRint::Run(bool) ()

    from /usr/local/root/root_v5.30.03/lib/libRint.so.5.30
#52 0x08048ebf in main ()

The lines below might hint at the cause of the crash. If they do not help you then please submit a bug 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.


#12 0xb5a46c1d in ?? () from

/usr/local/root/root_v5.30.03/lib/libHist.so.5.30
#13 0xb71e9c90 in TClass::Destructor(void*, bool) ()

    from /usr/local/root/root_v5.30.03/lib/libCore.so.5.30
#14 0xb626a2d9 in TBufferFile::ReadFastArray(void**, TClass const*, int,
bool, TMemberStreamer*, TClass const*) ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#15 0xb632b687 in int TStreamerInfo::ReadBuffer<char**>(TBuffer&, char**
const&, int, int, int, int) () from
/usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#16 0xb62ae1a9 in TStreamerInfoActions::GenericAction(TBuffer&, void*,
TStreamerInfoActions::TConfiguration const*) ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#17 0xb626439c in

TBufferFile::ReadSequence(TStreamerInfoActions::TActionSequence const&, void*) () from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#18 0xb626486b in TBufferFile::ReadClassBuffer(TClass const*, void*,
TClass const*) () from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#19 0xb44d674e in Selector::Streamer(TBuffer&) ()

    from /tmp/tnagel/aclic_builddir/Selector_cc.so
#20 0xb62a1afb in TKey::ReadObj() ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#21 0xb62751f1 in TDirectoryFile::Get(char const*) ()

    from /usr/local/root/root_v5.30.03/lib/libRIO.so.5.30
#22 0xb727159e in ?? () from

/usr/local/root/root_v5.30.03/lib/libCore.so.5.30

Root > Function testpol() busy flag cleared 

-- 
+-----------------------------------+--------------------------+
| Dipl.-Phys. Thiemo Nagel          |                          |
| Technische Universitaet Muenchen  | Room    PH1 3276         |
| Physik-Department E18             |                          |
| James-Franck-Strasse              | Phone  +49 89 289-12379  |
| D-85747 Garching                  | Fax    +49 89 289-12570  |
+-----------------------------------+--------------------------+
Received on Wed Nov 30 2011 - 18:19:05 CET

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