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Type:
Bug
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Status: Closed (View Workflow)
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Priority:
Critical
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 6.22/00
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Component/s: TTree
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Labels:None
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Environment:
master on commit c53e1bc583920a8213ef6094e931adbac904fe60
As pointed out in a forum post (https://root-forum.cern.ch/t/asnumpy-not-working-with-array-branches), RDF breaks with a segfault if you read data from a leaflist. Reproducer follows:
Edit: Changed the reproducer to a TTreeReaderArray only impl and added the respective backtrace.
#include "TFile.h"
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#include "TTree.h"
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#include "TTreeReader.h"
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#include "TTreeReaderArray.h"
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void make_file() { |
TFile f("file.root", "RECREATE"); |
TTree t("tree", "tree"); |
float x[10]; |
int n; |
t.Branch("n", &n, "n/I"); |
t.Branch("x", &x, "y[n]/F"); |
for(int i = 0; i < 10; i++) { |
n = i;
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for(int j = 0; j < n; j++) { |
x[j] = j;
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}
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t.Fill();
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};
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f.Write();
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f.Close();
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}
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int main() { |
make_file();
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auto f = TFile::Open("file.root"); |
TTreeReader r("tree", f); |
TTreeReaderArray<float> x(r, "x.y"); |
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r.Next();
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x.GetSize();
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return 0; |
}
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The debugger tells us the following:
#0 0x00007ffff4f2c508 in TTreeReaderValue<int>::Get (this=0x0)
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at /mnt/build/jenkins/workspace/lcg_release_latest/BUILDTYPE/Debug/COMPILER/gcc9binutils/LABEL/centos7/build/projects/ROOT-v6-18-00-patches/src/ROOT-v6-18-00-patches-build/include/TTreeReaderValue.h:156
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#1 0x00007ffff4f2bb2e in TTreeReaderValue<int>::operator* (this=0x0)
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at /mnt/build/jenkins/workspace/lcg_release_latest/BUILDTYPE/Debug/COMPILER/gcc9binutils/LABEL/centos7/build/projects/ROOT-v6-18-00-patches/src/ROOT-v6-18-00-patches-build/include/TTreeReaderValue.h:168
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#2 0x00007ffff4f27ea4 in (anonymous namespace)::TUIntOrIntReader<(anonymous namespace)::TLeafReader>::GetSize (this=0x15a9db0)
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at /mnt/build/jenkins/workspace/lcg_release_latest/BUILDTYPE/Debug/COMPILER/gcc9binutils/LABEL/centos7/build/projects/ROOT-v6-18-00-patches/src/ROOT/v6-18-00-patches/tree/treeplayer/src/TTreeReaderArray.cxx:230
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#3 0x00007ffff4f24a21 in (anonymous namespace)::TLeafParameterSizeReader::GetSize (this=0x15a9db0,
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proxy=0x15a9c60)
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at /mnt/build/jenkins/workspace/lcg_release_latest/BUILDTYPE/Debug/COMPILER/gcc9binutils/LABEL/centos7/build/projects/ROOT-v6-18-00-patches/src/ROOT/v6-18-00-patches/tree/treeplayer/src/TTreeReaderArray.cxx:328
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#4 0x00000000004017a2 in ROOT::Internal::TTreeReaderArrayBase::GetSize (this=0x7fffffffbf90)
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at /cvmfs/sft.cern.ch/lcg/releases/ROOT/v6-18-00-patches-00a33/x86_64-centos7-gcc9-dbg/include/TTreeReaderValue.h:108
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#5 main () at test.C:32
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ROOT-9783 RDataFrame-related tickets
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