CalDet<TPCPadFlags>: Protect against invalid reads#14855
Merged
sawenzel merged 1 commit intoAliceO2Group:devfrom Nov 25, 2025
Merged
CalDet<TPCPadFlags>: Protect against invalid reads#14855sawenzel merged 1 commit intoAliceO2Group:devfrom
sawenzel merged 1 commit intoAliceO2Group:devfrom
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A continuation of the CalDet<TPCFlags> saga, possibly related to https://its.cern.ch/jira/browse/O2-4671 Tests on ARM, even after deployment of the custom streamer in AliceO2Group#14830, still showed segfaults in TPC digitization. With the relevant code isolated into a unit test in AliceO2Group#14850, it was possible to do a valgrind study. This showed Invalid reads to the mData of CalArray. Thereafter, putting assert statements showed that we often access CalArray<PadFlags> data slightly out of bounds - irrespective of custom streamer or not. This then either indicates a problem in the code logic or a problem with the calibration CCDB objects. This should clearly be fixed. In the meantime, this commit adds a protection against invalid accesses and returns a trivial answer as well as an error message. This is in any case better than undefined behaviour. In addition, this commit introduces possibility to switch off the custom streamer for further studies.
sawenzel
requested review from
davidrohr,
shahor02 and
wiechula
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A continuation of the CalDet saga, possibly related to https://its.cern.ch/jira/browse/O2-4671
Tests on ARM, even after deployment of the custom streamer in #14830, still showed segfaults in TPC digitization.
With the relevant code isolated into a unit test in #14850, it was possible to do a valgrind study. This showed Invalid reads to the mData of CalArray.
Thereafter, putting assert statements showed that we often access CalArray data slightly out of bounds - irrespective of custom streamer or not. This then either indicates a problem in the code logic or a problem with the calibration CCDB objects. This should clearly be fixed.
In the meantime, this commit adds a protection against invalid accesses and returns a trivial answer as well as an error message. This is in any case better than undefined behaviour.
In addition, this commit introduces possibility to switch off the custom streamer for further studies.