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File corruption when adding new branch

Hello everyone,

I’m new to root and I get an error when I try to add a Branch to my existing TTree.
Everything works fine, but the first Entries seem to be corrupted while writing.
I can’t figure out why.

Here is the very simple test code (based on ROOT Manual - Functional parts/Trees):

void TestFunc() {
    TFile f("ntuples.root", "update");
    Float_t new_v;
    auto data = f.Get<TTree>("data");
    auto newBranch = data->Branch("new_v", &new_v, "new_v/F");
    Int_t entries = data->GetEntries();
    for (int i = 0; i < entries; i++)
    {
    	new_v = gRandom->Gaus(0, 1);
        newBranch->Fill();
    }
    data->Write("", TObject::kOverwrite);
}

Here is the error when I perform data->TTree::Scan();

************************************************************************************************************
*    Row   * particleI *   Ein.Ein * posX.posX * posY.posY * posZ.posZ * dirTheta. * dirPhi.di *     s0.s0 *
************************************************************************************************************
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:0, badread=0, nerrors=1, basketnumber=0
*        0 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:1, badread=0, nerrors=2, basketnumber=0
*        1 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:2, badread=0, nerrors=3, basketnumber=0
*        2 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:3, badread=0, nerrors=4, basketnumber=0
*        3 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:4, badread=0, nerrors=5, basketnumber=0
*        4 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:5, badread=0, nerrors=6, basketnumber=0
*        5 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:6, badread=0, nerrors=7, basketnumber=0
*        6 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:7, badread=0, nerrors=8, basketnumber=0
*        7 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:8, badread=0, nerrors=9, basketnumber=0
*        8 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
 file probably overwritten: stopping reporting error messages
Error in <TBranch::GetBasket>: File: ntuples.root at byte:0, branch:particleID, entry:9, badread=0, nerrors=10, basketnumber=0
*        9 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       10 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       11 *         0 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       12 *        16 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       13 *        17 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       14 *        36 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       15 *        37 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       16 *        72 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       17 *        73 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       18 *        84 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       19 *        85 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       20 *         4 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       21 *         5 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       22 *        32 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       23 *        33 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
*       24 *        54 *      2000 *         0 *         0 *    -0.965 * 0.1684121 *         0 *         0 *
Type <CR> to continue or q to quit ==>

I don’t understand how to solve the problem. I understand there was a problem when writing the file, but I don’t know how to fix it.

Many thanks for your help,

Matthieu

ROOT Version: 6.22/06
Platform: Linux/Ubuntu

What software was used to create the original “ntuples.root” file?

Hi !

Geant4 v10.06.p02.

Here is the non-corrupted file:

ntuples.root (137.2 KB)

Edit: with MT mode ON.

Complain to Geant4 developers.

1 Like

I see!

Thanks a lot for the quick answer!