Segmentation violation in cloning trees

Shilpi · September 17, 2011, 12:53pm

Hello all,

I am trying to clone some event from 6 trees.
They way I am doing is:

TChain t("myEvent"); t.Add(<filenames>); TTree *nt=(TTree*)t.CloneTree(nevents);

All 6 trees combined have 1518115 events.
If I give nevents = 100, 1000 or 10000, it works well.
If I give 50000, then it gives me segmentation violation[1]

Any help is appreciated.

Best Regards,
Shilpi

[1]
[color=#FF0040]===========================================================
There was a crash.
This is the entire stack trace of all threads:

#0 0x000000360b29a115 in waitpid () from /lib64/libc.so.6
#1 0x000000360b23c481 in do_system () from /lib64/libc.so.6
#2 0x00002ac2ba7b8222 in TUnixSystem::StackTrace() ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#3 0x00002ac2ba7b8cdc in TUnixSystem::DispatchSignals(ESignals) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#4
#5 0x00002ac2bbfffd00 in TBranch::GetEntry(long long, int) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#6 0x00002ac2bc047180 in TTree::GetEntry(long long, int) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#7 0x00002ac2bc04d93f in TTree::CopyEntries(TTree, long long, char const) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#8 0x00002ac2bc04f2a8 in TTree::CloneTree(long long, char const) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#9 0x00002ac2bc0d2428 in GGTree_110_0_35(Gvalue, char const, Gparam, int) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#10 0x00002ac2bad22114 in Cint::GExceptionWrapper(int ()(Gvalue, char const, Gparam, int), Gvalue, char, G__param, int) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#11 0x00002ac2badd8a70 in G__execute_call ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#12 0x00002ac2badd9879 in G__call_cppfunc ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#13 0x00002ac2badb83d6 in G__interpret_func ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#14 0x00002ac2bada6274 in G__getfunction ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#15 0x00002ac2bae8b556 in G__getstructmem ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#16 0x00002ac2bae80990 in G__getvariable ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#17 0x00002ac2bad7907f in G__getitem ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#18 0x00002ac2bad7db54 in G__getexpr ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#19 0x00002ac2bada5bea in G__getfunction ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#20 0x00002ac2bad7980a in G__getitem ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#21 0x00002ac2bad7db54 in G__getexpr ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#22 0x00002ac2bad6a43a in G__define_var ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#23 0x00002ac2bae02c39 in G__exec_statement ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#24 0x00002ac2bad652dc in G__exec_tempfile_core ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#25 0x00002ac2bad655be in G__exec_tempfile_fp ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#26 0x00002ac2bae132f2 in G__process_cmd ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCint.so
#27 0x00002ac2ba77a705 in TCint::ProcessLine(char const, TInterpreter::EErrorCode) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#28 0x00002ac2ba6d61ba in TApplication::ProcessLine(char const, bool, int*) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#29 0x00002ac2bb8c2008 in TRint::HandleTermInput() ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libRint.so
#30 0x00002ac2ba7b6214 in TUnixSystem::CheckDescriptors() ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#31 0x00002ac2ba7b6830 in TUnixSystem::DispatchOneEvent(bool) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#32 0x00002ac2ba734636 in TSystem::InnerLoop() ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#33 0x00002ac2ba73667c in TSystem::Run() ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#34 0x00002ac2ba6d40ef in TApplication::Run(bool) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libCore.so
#35 0x00002ac2bb8c3d28 in TRint::Run(bool) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libRint.so
#36 0x000000000040100d 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
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.

#5 0x00002ac2bbfffd00 in TBranch::GetEntry(long long, int) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#6 0x00002ac2bc047180 in TTree::GetEntry(long long, int) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#7 0x00002ac2bc04d93f in TTree::CopyEntries(TTree, long long, char const) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so
#8 0x00002ac2bc04f2a8 in TTree::CloneTree(long long, char const*) ()
from /uscmst1/prod/sw/cms/slc5_amd64_gcc434/lcg/root/5.27.06b-cms21/lib/libTree.so

==============================================[/color]

Shilpi · September 17, 2011, 2:00pm

Please note that I am cloning tree to combine two trees using different events.
i.e. I have a tree1 and tree2 with total entries as nev1 and nev2.
I want to combine the two trees by taking nentreis1 from the first tree and nentreis2 from the second.
I am using CloneTree for this purpose.

Is there a better way of doing this?

Thanks,
Shilpi

pcanal · September 17, 2011, 2:01pm

Hi,

Does it matter which files are in the chain? Is the output TTree stored in a (new) file? What is the result of running your failing example with valgrind?

Philippe.

leszczo · September 18, 2011, 5:47pm

Hi,

Try to save cloned tree to the file, it should help.

Shilpi · September 18, 2011, 6:48pm

Hi Philippe, Leszczo,

Many thanks for your reply. I was not saving the trees in the
file. I did that step and that error is solved.

Thanks for the suggestions,
Shilpi

Segmentation violation in cloning trees

[1] [color=#FF0040]=========================================================== There was a crash. This is the entire stack trace of all threads:

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

[1]
[color=#FF0040]===========================================================
There was a crash.
This is the entire stack trace of all threads:

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