Frozen TTreeReaderArray #21440
Description
Check duplicate issues.
- Checked for duplicates
Description
Hi all,
I encountered system-depended issue when trying to read a bit strangely defined tree
Int_t nb;
UShort_t boardId[100];
tree->Branch("nb", &nb, "nb/I");
tree->Branch("boardId", boardId, "board[nb]/s");e.i. when the name of the branch is different from the single variable name in the leaflist. For such branch the default TSelector does not create properly named TTreeReaderArray, it fails in runtime. The one definition that works is
TTreeReaderArray<UShort_t> board = {fReader, "boardId.board"};Problem is - on some systems the code freeze when trying to access the value pointed at by the reader or getting the size of the array.
Problem encountered with:
Almalinux 9.7 5.14.0-570.37.1.el9_6.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Aug 26 10:33:12 EDT 2025 x86_64 x86_64 x86_64 GNU/Linux; ROOT version 6.36.06
Debian 12 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64 GNU/Linux; ROOT version 6.36.08
Where it works/does not freeze:
Debian 12 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u5 (2019-08-11) x86_64 GNU/Linux; ROOT version 6.36.08
Reproducer
Minimal reproducer using TSelector
https://github.com/matLogh/rootbug_ttreereaderarray
ROOT version
tested with 6.36.06 and 6.36.08
Installation method
build from source (all listed)
Operating system
Debian 12, Debian 12(WSL) and AlmaLinux
Additional context
No response