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[6.40] [RF] Don't touch deleted nodes in RooFit::Evaluator destructor - #23911
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The Evaluator resets the data tokens of all nodes of its computation graph in the destructor, through raw pointers and without knowing whether the nodes still exist. Nodes that outlive the Evaluator need this reset, because a node can only be registered with one Evaluator at a time. But nodes can also be deleted before the Evaluator: the compiled NLL graph of a RooMomentMorphFuncND references the original morph function and its RooHistPdf templates owned by the RooWorkspace, and at the exit of a Python script the garbage collector can delete the workspace before the NLL object. The destructor then writes into freed memory, which showed up as a `free(): invalid pointer` abort of tutorial-roofit-roofit-rf616_morphing-py in the v6-42-00-rc1 release build on ubuntu2610 (valgrind: "Invalid write of size 8" in RooFit::Evaluator::~Evaluator()). Track the ownership of the data token: RooAbsArg remembers the Evaluator that set its token, tells it in the destructor that the node is gone (Evaluator::unregisterNode), and the Evaluator skips such nodes when resetting the tokens. Add a unit test for the Evaluator that deletes a node before the Evaluator and checks that tokens can be reused in both orders, and a regression test for the workspace-deleted-before-NLL scenario with the morph pdf. This also means we can remove the workarounds in the tutorials introduced by commits 49fb353 and 0687911. 🤖 Done with the help of AI
guitargeek
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Backport of #23893.