[Bug 1193177] sqlite3_drv bad memory free and severe performance bug - with patch

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https://bugzilla.redhat.com/show_bug.cgi?id=1193177



--- Comment #10 from Stuart D Gathman <stuart@xxxxxxxxxxx> ---
However, there is just one table immediately updated (no reads between BEGIN
and UPDATE/INSERT).  If that update fails to obtain the lock, we error out
correctly with a rollback.  There can be no deadlock with just one table
locked, so it is equivalent to IMMEDIATE MODE in this instance.

I'm also noticing that the update uses data fetched from a previous
_get_all_spam_records(), that was NOT in the transaction.  So correctness
depends on the dspam lock file.   So this transaction is purely an efficiency
issue.

With that, I'll quit pontificating until I have an actual test case that breaks
it.

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