Sorry, this happened over a month ago, and the VM in question (lxplus108) has since been destroyed (which is normal procedure, not indication of some major issue with it) - we also have no detailed (and easily accessible) monitoring.
However, these machines run with heuristic overcommit (/proc/sys/vm/overcommit_memory = 0) and no ulimit on memory, so would not expect a malloc() - with reasonable size - to fail.
(internal link: https://its.cern.ch/jira/browse/EOS-1545 - just for bookkeeping, no more info)
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