On 8 Nov 2019, at 10:02pm, MA LIG <[email protected]> wrote:

> I've tried other permutations of various flags that go along for
> sqlite3_open_v2 , as well as setting pragma read_uncommitted, but can't
> seem to get multi-threaded concurrent rapid-fire querying to work at all.

Please set a timeout of at least 5000 milliseconds for every connection which 
opens the file:

<https://sqlite.org/c3ref/busy_timeout.html>

Find out whether this prevents your deadlocks/crashes.
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