This has been reported in the past to the maintainer.
https://lists.gnu.org/archive/html/bug-bash/2015-07/msg00073.html
https://lists.gnu.org/archive/html/bug-bash/2017-04/msg00063.html
https://lists.gnu.org/archive/html/bug-bash/2017-06/msg00052.html
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Bug reported upstream too.
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https://bugs.launchpad.net/bugs/1860133
Title:
Memory leak on set_default_locale
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Note: The version embeded in 16.04 does not have the bug (although it is
bash 4.3) but the next releases has it (tested on 18.04 and 19.10). Also
tested on Debian Buster.
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