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    <p>I found a deadlock on sqlite3 ruby extension and fix it here: have a go with it and see if this fixes ur problem. </p> <pre> https://github.com/dxj19831029/sqlite3-ruby </pre> <p>I opened a pull request, no response from them anymore.</p> <p>Anyway, some busy exception is expected as described in sqlite3 itself. </p> <p><strong>Be aware</strong> with this condition: <a href="http://www.sqlite.org/c3ref/busy_handler.html" rel="nofollow">sqlite busy</a></p> <pre> The presence of a busy handler does not guarantee that it will be invoked when there is lock contention. If SQLite determines that invoking the busy handler could result in a deadlock, it will go ahead and return SQLITE_BUSY or SQLITE_IOERR_BLOCKED instead of invoking the busy handler. Consider a scenario where one process is holding a read lock that it is trying to promote to a reserved lock and a second process is holding a reserved lock that it is trying to promote to an exclusive lock. The first process cannot proceed because it is blocked by the second and the second process cannot proceed because it is blocked by the first. If both processes invoke the busy handlers, neither will make any progress. Therefore, SQLite returns SQLITE_BUSY for the first process, hoping that this will induce the first process to release its read lock and allow the second process to proceed. </pre> <p>If you meet this condition, timeout isn't valid anymore. To avoid it, don't put select inside begin/commit. or use exclusive lock for begin/commit.</p> <p>Hope this helps. :)</p>
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