Dear experts, The post is a bit long, since the issue is somewhat convoluted. I’m having a very weird issue when trying to clone a TTree and modify its content before saving it. The full application is crashing when when I do TTree::Fill() on the clone tree with the following stack trace The line…

Now the code crashes in the third event read. So indeed there is a bug in ResetBranchAddresses, I opened the issue at TTree/TChain ResetBranchAddress does not propagate the reset to the clones · Issue #19402 · root-project/root · GitHub To work around the issue use both: chain->ResetBranchAd…

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Possible issue when cloning trees

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