Did you install any third-party items?
I can see here in your log this:
180918 10:10:10 Percona XtraDB (http://www.percona.com) 5.5.52-MariaDB-38.3 started; log sequence nu$
I can see here in your log this:
180918 10:10:10 Percona XtraDB (http://www.percona.com) 5.5.52-MariaDB-38.3 started; log sequence nu$
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