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Centos pre-thread db connection using WAL journal_mode
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I suspect you've got cross-thread data leakage. You cannot, for example, use one thread to query the DB and another to consume the results from that query without making a copy in RAM before passing the data off to the other thread.

When was the last time you ran something like [TSAN] or [Helgrind] on that program?

[Helgrind]: https://www.valgrind.org/docs/manual/hg-manual.html
[TSAN]: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/Thread_Sanitizer