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[6.40] [RF] Fix dangling stack normSet after xRooNode::BuildHistogram - #22945
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guitargeek merged 2 commits intoJul 28, 2026
Merged
guitargeek merged 2 commits into
guitargeek merged 2 commits into
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Expose setProxyNormSet so that external code can make an object forget a normalization set previously passed to `getVal()`. This is needed when that set may not outlive the object (e.g. it lived on the caller's stack), since the proxies only keep a bare pointer to it. Symmetric to the already-public `RooAbsPdf::setActiveNormSet`. 🤖 Done with the help of AI. (cherry picked from commit b0555ea)
BuildHistogram evaluates the model with a stack-local `normSet`. RooFit proxies only cache a bare pointer to the last normalization set and re-use it later (e.g. RooProduct::evaluate reads back _compRSet.nset()), so once `normSet` goes out of scope those proxies dangle into freed stack memory. A subsequent evaluation then reads it, reported by valgrind as "use of uninitialised value" in RooAbsReal::getValV (nset->uniqueId()). `sterilize()` was meant to forget the passed normSet, but in >=6.27 that code is disabled (the uniqueId invalidity check only guards `RooAbsPdf::_normSet`, not the proxy pointers) and it only walks clients, whereas getVal() propagates the normSet down to the servers of the evaluated function. Reset the proxy normSet on the whole server tree of every function we called getVal() on, before `normSet` is destroyed. 🤖 Done with the help of AI. (cherry picked from commit afd1b26)
guitargeek
merged commit Jul 28, 2026
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root-project:v6-40-00-patches
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Backport of #22932, requested by @guitargeek.