Segmentation Fault using Cuts

ROOT
1

I get the same segfault as the last one in this thread when I run my code, although my problem is the same as the thread “Odd behaviour when using several TCuts” in that I get the segfault after adding a fourth TCut, but any of the four cuts work individually or in groups of 2 or 3. I have implemented the solution given in both threads, but still get the same segfault. Im using root Version 5.14/00b. My macro and necessary files can be found at:

minos.phy.tufts.edu/danche/rootproblem/

Thanks

Dan

2

Hi Dan,

I moved your post under this new topic, because of the specific problem. The crash I got is not identical with the previous one. Using your example I’ve got the following bt:0x0021b489 in TString::Length (this=0xbffdef00) at include/TString.h:347 347 Ssiz_t Length() const { return Pref()->fNchars; } (gdb) bt #0 0x0021b489 in TString::Length (this=0xbffdef00) at include/TString.h:347 #1 0x0026bdee in TString::Index (this=0xbffdef00, pattern=0x12b3231 "prof", plen=4, startIndex=0, cmp=kExact) at base/src/TString.cxx:627 #2 0x00236671 in TString::Contains (this=0xbffdef00, s=0x12b3231 "prof", cmp=kExact) at include/TString.h:501 #3 0x011d146b in TSelectorDraw::Begin (this=0x9302d90, tree=0x90deca8) at treeplayer/src/TSelectorDraw.cxx:455 #4 0x01202fde in TTreePlayer::Process (this=0x9302d48, selector=0x9302d90, option=0x8b0cc12 "", nentries=109758, firstentry=0) at treeplayer/src/TTreePlayer.cxx:2625 #5 0x011fb840 in TTreePlayer::DrawSelect (this=0x9302d48, varexp0=0x928da38 "NueRecord.srevent.phNueGeV>>htemp1a", selection=0x92e2f78 "(NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004)* (((((NueRecord.srevent.phNueGeV>2&&NueRecord.srevent.showers==1&&NueRecord.srevent.tracks<2) &&(shwfit.par_a>0.64&&shwfit.par_"..., option=0x8b0cc12 "", nentries=1234567890, firstentry=0) at treeplayer/src/TTreePlayer.cxx:995 #6 0x08a606da in TTree::Draw (this=0x90deca8, varexp=0x928da38 "NueRecord.srevent.phNueGeV>>htemp1a", selection=0x92e2f78 ) at tree/src/TTree.cxx:3067 #7 0x08a31963 in TChain::Draw (this=0x90deca8, varexp=0x928da38 "NueRecord.srevent.phNueGeV>>htemp1a", selection=0x92e2f78 "(NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004)* (((((NueRecord.srevent.phNueGeV>2&&NueRecord.srevent.showers==1&&NueRecord.srevent.tracks<2) &&(shwfit.par_a>0.64&&shwfit.par_"..., option=0x8b0cc12 "", nentries=1234567890, firstentry=0) at tree/src/TChain.cxx:660 #8 0x08a3181b in TChain::Draw (this=0x90deca8, varexp=0x928da38 "NueRecord.srevent.phNueGeV>>htemp1a", selection=@0x92af1f8, option=0x8b0cc12 "", nentries=1234567890, firstentry=0) at tree/src/TChain.cxx:640 ...

Cheers, Ilka

3

The segfault I get looks like this:

*** Break *** segmentation violation
Using host libthread_db library “/lib/tls/libthread_db.so.1”.
Attaching to program: /proc/21547/exe, process 21547
[Thread debugging using libthread_db enabled]
[New Thread 1100843488 (LWP 21547)]
0xffffe410 in ?? ()
#1 0xbffe074c in ?? ()
#2 0x00000000 in ?? ()
#3 0xbffe0608 in ?? ()
#4 0x41915273 in waitpid () from /lib/tls/libc.so.6
#5 0x418c05a4 in strtold_l () from /lib/tls/libc.so.6
#6 0x4188667d in system () from /lib/tls/libpthread.so.0
at unix/src/TUnixSystem.cxx:1768
#8 0x40303038 in TUnixSystem::StackTrace (this=0x8319528) at unix/src/TUnixSystem.cxx:1953
#9 0x40300f77 in TUnixSystem::DispatchSignals (this=0x8319528, sig=kSigSegmentationViolation) at unix/src/TUnixSystem.cxx:936
#10 0x402ff199 in SigHandler (sig=kSigSegmentationViolation) at unix/src/TUnixSystem.cxx:338
#11 0x40305b0a in sighandler (sig=11) at unix/src/TUnixSystem.cxx:3142
#12
#13 0x40156f2d in TString::Length (this=0xbffe34c0) at TString.h:348
#14 0x401e9758 in TString::Index (this=0xbffe34c0, pattern=0x42fb60c9 “prof”, plen=4, startIndex=0, cmp=kExact) at base/src/TString.cxx:544
#15 0x4017f00f in TString::Contains (this=0xbffe34c0, s=0x42fb60c9 “prof”, cmp=kExact) at TString.h:503
#16 0x42ed4264 in TSelectorDraw::Begin (this=0x98379a0, tree=0x8f609d0) at treeplayer/src/TSelectorDraw.cxx:401
#17 0x42f0581b in TTreePlayer::Process (this=0x8f86610, selector=0x98379a0, option=0x414cae40 “”, nentries=109758, firstentry=0)
at treeplayer/src/TTreePlayer.cxx:2596
#18 0x42efe051 in TTreePlayer::DrawSelect (this=0x8f86610, varexp0=0x8c97da8 “NueRecord.srevent.phNueGeV>>htemp1a”,
selection=0x8cba9a0 “(NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004)(((((NueRecord.srevent.phNueGeV>2&&NueRecord.srevent.showers==1&&NueRecord.srevent.tracks<2)&&(shwfit.par_a>0.64&&shwfit.par_"…, option=0x414cae40 “”, nentries=1234567890, firstentry=0) at treeplayer/src/TTreePlayer.cxx:967
#19 0x4141f48c in TTree::Draw (this=0x8f609d0, varexp=0x8c97da8 “NueRecord.srevent.phNueGeV>>htemp1a”,
selection=0x8cba9a0 "(NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004)(((((NueRecord.srevent.phNueGeV>2&&NueRecord.srevent.showers==1&&NueRecord.srevent.tracks<2)&&(shwfit.par_a>0.64&&shwfit.par_”…, option=0x414cae40 “”, nentries=1234567890, firstentry=0) at tree/src/TTree.cxx:3017
#20 0x413f2545 in TChain::Draw (this=0x8f609d0, varexp=0x8c97da8 “NueRecord.srevent.phNueGeV>>htemp1a”,
selection=0x8cba9a0 "(NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004)(((((NueRecord.srevent.phNueGeV>2&&NueRecord.srevent.showers==1&&NueRecord.srevent.tracks<2)&&(shwfit.par_a>0.64&&shwfit.par_"…, option=0x414cae40 “”, nentries=1234567890, firstentry=0) at tree/src/TChain.cxx:649
#21 0x413f240b in TChain::Draw (this=0x8f609d0, varexp=0x8c97da8 “NueRecord.srevent.phNueGeV>>htemp1a”, selection=@0x97e4aa0, option=0x414cae40 “”,
nentries=1234567890, firstentry=0) at tree/src/TChain.cxx:629
#22 0x41472752 in G__G__Tree_225_0_16 () from /home/minos/Minossoft/root/pro/lib/libTree.so
#23 0x408d9ca5 in Cint::G__ExceptionWrapper (funcp=0x414724ac <G__G__Tree_225_0_16(G__value, char const*, G__param*, int)>, result7=0xbfff0db0,
funcname=0x8ad3de8 “\001”, libp=0xbffed7d0, hash=0) at cint/src/Api.cxx:355
#24 0x4099f936 in G__call_cppfunc (result7=0xbfff0db0, libp=0xbffed7d0, ifunc=0x8ad3de8, ifn=0) at cint/src/v6_newlink.cxx:465
#25 0x40989b90 in G__interpret_func (result7=0xbfff0db0, funcname=0xbfff09b0 “Draw”, libp=0xbffed7d0, hash=398, p_ifunc=0x8ad3de8, funcmatch=1, memfunc_flag=1)
at cint/src/v6_ifunc.cxx:5167
#26 0x40972237 in G__getfunction (
item=0x973762e “Draw(var1a,“NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004”(precuts&&shwfitcuts1&&shwfitcuts2&&shwfitcuts3&&shwfitcuts4))", known3=0xbfff260c, memfunc_flag=1) at cint/src/v6_func.cxx:2600
#27 0x40a231ff in G__getstructmem (store_var_type=112, varname=0xbfff2270 “øó\023\n”,
membername=0x973762e "Draw(var1a,“NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004”(precuts&&shwfitcuts1&&shwfitcuts2&&shwfitcuts3&&shwfitcuts4))”, tagname=0xbfff15d0 “Data”, known2=0xbfff260c, varglobal=0x40aac9a0, objptr=2) at cint/src/v6_var.cxx:4468
#28 0x40a18a9e in G__getvariable (
item=0x9737628 “Data->Draw(var1a,“NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004”(precuts&&shwfitcuts1&&shwfitcuts2&&shwfitcuts3&&shwfitcuts4))", known2=0xbfff260c, varglobal=0x40aac9a0, varlocal=0x0) at cint/src/v6_var.cxx:3234
#29 0x40966776 in G__getitem (
item=0x9737628 "Data->Draw(var1a,“NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004”(precuts&&shwfitcuts1&&shwfitcuts2&&shwfitcuts3&&shwfitcuts4))”) at cint/src/v6_expr.cxx:1846
#30 0x40964dd2 in G__getexpr (
expression=0xbfff4780 “Data->Draw(var1a,“NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004”(precuts&&shwfitcuts1&&shwfitcuts2&&shwfitcuts3&&shwfitcuts4))") at cint/src/v6_expr.cxx:1315
#31 0x409bdc8d in G__exec_function (
statement=0xbfff4780 "Data->Draw(var1a,“NueRecord.mctrue.interactionType==0&&NueRecord.mctrue.resonanceCode<1004”(precuts&&shwfitcuts1&&shwfitcuts2&&shwfitcuts3&&shwfitcuts4))”, pc=0xbfff477c, piout=0xbfff4770, plargestep=0xbfff4760, presult=0xbfff4b80) at cint/src/v6_parse.cxx:457
#32 0x409c734a in G__exec_statement () at cint/src/v6_parse.cxx:4187
#33 0x40943fe7 in G__exec_tempfile_core (file=0xbfffcef0 “/home/danche/ViewScan5/NueAna/./macros/wekafriends_CutonAllNueAnavars.C”, fp=0x0)
at cint/src/v6_debug.cxx:358
#34 0x4094426a in G__exec_tempfile (file=0xbfffcef0 “/home/danche/ViewScan5/NueAna/./macros/wekafriends_CutonAllNueAnavars.C”) at cint/src/v6_debug.cxx:433
#35 0x409d18d3 in G__process_cmd (line=0x4081bbdc “.x /home/danche/ViewScan5/NueAna/./macros/wekafriends_CutonAllNueAnavars.C”, prompt=0x831c4ec “”,
more=0x831c4e4, err=0xbfffd74c, rslt=0xbfffd750) at cint/src/v6_pause.cxx:3218
#36 0x402576d7 in TCint::ProcessLine (this=0x831c4c8, line=0x4081bbdc “.x /home/danche/ViewScan5/NueAna/./macros/wekafriends_CutonAllNueAnavars.C”, error=0x0)
at meta/src/TCint.cxx:318
#37 0x4025785c in TCint::ProcessLineSynch (this=0x831c4c8, line=0x4081bbdc “.x /home/danche/ViewScan5/NueAna/./macros/wekafriends_CutonAllNueAnavars.C”, error=0x0)
at meta/src/TCint.cxx:351
#38 0x4015cd11 in TApplication::ProcessFile (this=0x8368330, name=0x8e44693 “macros/wekafriends_CutonAllNueAnavars.C”, error=0x0) at base/src/TApplication.cxx:804
#39 0x4015c4ef in TApplication::ProcessLine (this=0x8368330, line=0x8e44690 “.x macros/wekafriends_CutonAllNueAnavars.C”, sync=false, err=0x0)
at base/src/TApplication.cxx:676
#40 0x41758162 in TRint::HandleTermInput (this=0x8368330) at rint/src/TRint.cxx:500
#41 0x41756248 in TTermInputHandler::Notify (this=0x8a58940) at rint/src/TRint.cxx:121
#42 0x417590d6 in TTermInputHandler::ReadNotify (this=0x8a58940) at rint/src/TRint.cxx:113
#43 0x40301319 in TUnixSystem::CheckDescriptors (this=0x8319528) at unix/src/TUnixSystem.cxx:1046
#44 0x40300696 in TUnixSystem::DispatchOneEvent (this=0x8319528, pendingOnly=false) at unix/src/TUnixSystem.cxx:754
#45 0x401fd8e6 in TSystem::InnerLoop (this=0x8319528) at base/src/TSystem.cxx:347
#46 0x401fd874 in TSystem::Run (this=0x8319528) at base/src/TSystem.cxx:315
#47 0x4015cf62 in TApplication::Run (this=0x8368330, retrn=false) at base/src/TApplication.cxx:824
#48 0x41757a2c in TRint::Run (this=0x8368330, retrn=false) at rint/src/TRint.cxx:359
#49 0x08048952 in main (argc=2, argv=0xbfffe4e4) at main/src/rmain.cxx:29
Root > !!!Dictionary position not recovered because G__unloadfile() is used in a macro!!!

4

Hi Dan,

The crash info provided by you is exactly what I got - the only difference comes from runnung root with gdb in my case. I will leave the further investigation of your case to our experts with deep knowledge about trees and cuts.

Cheers, Ilka

5

Hi,

This problem is now fixed in CVS. Note that the problem was not the number of Cuts but rather the sheer length of the resulting cut (2601 characters!).

Cheers,
Philippe