Re: a strange behavior in TTree::ChangeFile

I am suspecting a problem when closing the last file. See important remark in the documentation of TTree::ChangeFile at: http://root.cern.ch/root/htmldoc/TTree.html#TTree:ChangeFile

Rene Brun

Kazuyoshi Furutaka wrote:
> Dear rooters,
>
> I wrote a routine which loops over filling
> of a TTree consisting of about 40 C-style
> struct data (2 UShort_t's and a Float_t)
> and store the TTree in a .root file.
>
> When the size of the file exceeds about
> 1.9GB, TTree::ChageFile is called; just
> after the call a segmentation fault occurs.
> The size of the .root file is 1903347510 bytes.
>
> If I break the filling loop before the file
> grows larger enough (say about a few thousand
> of the data), the error doesn't occur.
>
> Also, if I double the max tree size
> (TTree::SetMaxTreeSize(3800000000)),
> it works without SegV.
>
> How can I avoid the error without increasing
> the tree size?
> I'll appreciate any suggestions.
>
> The attached is a part of a backtrace of a gdb
> session.
>
> My environment is:
> Linux, Fedora Core release 6 (Zod), running
> kernel 2.6.20-1.2933.fc6 #1 SMP
> on a Core 2 Duo machine (i386).
> Root Version 5.15/04, built with
> g++ (GCC) 4.1.1 20070105 (Red Hat 4.1.1-51).
> (The routine was also compiled using the
> ACLiC.)
>
> Thanks in advance.
>
> Yours,
> Kazuyoshi
> --
> Kazuyoshi Furutaka
> furutaka_at_jb3.so-net.ne.jp
>
> ------------------------------------------------------------------------
>
> nev = 34600000
> nev = 34700000
> Warning in <TTree::ChangeFile>: file coin18387_prjTreeKim_1.root already exist, trying with 2 underscores
> Warning in <TTree::ChangeFile>: file coin18387_prjTreeKim__1.root already exist, trying with 3 underscores
> Fill: Switching to new file: coin18387_prjTreeKim___1.root
> ======================================
> Block number = 1698408
> info: 0
> type: 3
> ID: 0
> Serial: 60033
> LastByte:3
> ======================================
> ======================================
> I N F O
> ======================================
> run#: 18387
> evsize: 88
> version:1
> list-id:Coincidence
> date: Tue Nov 21 20:29:45
> event: SAD\8192\0x8100\0xff00,FER\2048\0x8300\0xff00
> (LAST)
> ======================================
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread -1208834352 (LWP 21623)]
> 0x4613b538 in main_arena () from /lib/libc.so.6
> (gdb) bt
> #0 0x4613b538 in main_arena () from /lib/libc.so.6
> #1 0x00ee84d9 in prjTreeKim (ifnam=@0xbfbac5d8, rootfnam=@0xbfbac5d4,
> calfnam=@0xbfbac5cc)
> at /home/furutaka/res/ana/KUR2006Nov/Run18387-NaCl/./../prjTreeKim.C:366
> #2 0x00ee8812 in G__fileKx8Fep__0_1293 (result7=0xbfbba004,
> funcname=0x8d38250 "\001", libp=0xbfbb6560, hash=0)
> at /home/furutaka/res/ana/KUR2006Nov/Run18387-NaCl/./../fileKx8Fep.cxx:260
> #3 0x009851ad in Cint::G__ExceptionWrapper ()
> from /usr/local/root/lib/libCint.so
> #4 0x00a5f0a8 in G__call_cppfunc () from /usr/local/root/lib/libCint.so
> #5 0x00a3b212 in G__interpret_func () from /usr/local/root/lib/libCint.so
> #6 0x00a2c796 in G__getfunction () from /usr/local/root/lib/libCint.so
> #7 0x00a038fb in G__getitem () from /usr/local/root/lib/libCint.so
> #8 0x00a12f73 in G__getexpr () from /usr/local/root/lib/libCint.so
> #9 0x00a7ebd8 in G__exec_function () from /usr/local/root/lib/libCint.so
> #10 0x00a8406d in G__exec_statement () from /usr/local/root/lib/libCint.so
> #11 0x009ee645 in G__exec_tempfile_core () from /usr/local/root/lib/libCint.so
> #12 0x009ee8c5 in G__exec_tempfile () from /usr/local/root/lib/libCint.so
> #13 0x00a90cc7 in G__process_cmd () from /usr/local/root/lib/libCint.so
> #14 0x003b54a3 in TCint::ProcessLine () from /usr/local/root/lib/libCore.so
> #15 0x003b0114 in TCint::ProcessLineSynch ()
> from /usr/local/root/lib/libCore.so
> #16 0x003279af in TApplication::ProcessFile ()
> from /usr/local/root/lib/libCore.so
> #17 0x003259ae in TApplication::ProcessLine ()
> from /usr/local/root/lib/libCore.so
> #18 0x0011b534 in TRint::HandleTermInput () from /usr/local/root/lib/libRint.so
> #19 0x0011abad in TTermInputHandler::Notify ()
> from /usr/local/root/lib/libRint.so
> #20 0x0011cbd6 in TTermInputHandler::ReadNotify ()
> from /usr/local/root/lib/libRint.so
> #21 0x003e060c in TUnixSystem::CheckDescriptors ()
> from /usr/local/root/lib/libCore.so
> #22 0x003e0be2 in TUnixSystem::DispatchOneEvent ()
> ---Type <return> to continue, or q <return> to quit---
> from /usr/local/root/lib/libCore.so
> #23 0x00376a33 in TSystem::InnerLoop () from /usr/local/root/lib/libCore.so
> #24 0x00378041 in TSystem::Run () from /usr/local/root/lib/libCore.so
> #25 0x00324b8c in TApplication::Run () from /usr/local/root/lib/libCore.so
> #26 0x0011c9d9 in TRint::Run () from /usr/local/root/lib/libRint.so
> #27 0x08048cb0 in main ()
> (gdb) quit
> The program is running. Exit anyway? (y or n) y
>
Received on Tue Apr 03 2007 - 16:30:32 CEST