Description
Describe the bug
Doing:
#include <TBufferFile.h>
#include <TFile.h>
#include <TTree.h>
#include <iostream>
void bar() {
auto f = TFile::Open("/Users/ktf/Downloads/AO2D-2.root");
char const *dfs[1] = {"DF_2449800039997798139;1"};
for (auto di = 0; di < 1; di++) {
auto df = dfs[di];
auto d = (TDirectoryFile*)f->Get(df);
std::cout << "Reading DF " << df << std::endl;
char const *treeNames[4] = {"O2bc", "O2collision", "O2fdd", "O2ft0"};
for (auto ti = 0; ti < 4; ti++) {
std::cout << ti << std::endl;
std::cout << treeNames[ti] << std::endl;
auto t = (TTree*)d->Get(treeNames[ti]);
t->SetClusterPrefetch(true);
auto branchList = t->GetListOfBranches();
auto e = t->GetEntries();
for (auto bi = 0; bi < branchList->GetEntries(); ++bi) {
auto b = (TBranch*)branchList->At(bi);
assert(b);
int pos = 0;
while (pos < e) {
b->Print();
TBufferFile buf(TBuffer::EMode::kWrite, 32*1024);
auto &r = b->GetBulkRead();
auto s = r.GetBulkEntries(0, buf);
pos += s;
std::cout << "Read " << s << " elements " << std::endl;
}
}
}
}
}crashes with:
[22971:internal-dpl-aod-reader_t0]: Fatal: fExtraBasket == nullptr && "fExtraBasket should have been set to nullptr by GetFreshBasket" violated at line 1523 of `/Users/ktf/src/sw/SOUR
CES/ROOT/ad1ddb8593/0/tree/tree/src/TBranch.cxx'if one of the branches has more than one basket. Removing t->SetClusterPrefetch(true) fixes the issue. Notice how it still works fine with branches which have only one basket. I can provide a file to reproduce if needed.
Expected behavior
I would expect it to work.
Setup
Vanilla 6.24.02 on linux or macOS.