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Before MariaDB 10.3.5, the binlog position was stored in the TRX_SYS page, while after it is stored in rollback segments. There is code to read the legacy position from TRX_SYS to handle upgrades. The problem was if the legacy position happens to compare larger than the position found in rollback segments; in this case, the old TRX_SYS position would incorrectly be preferred over the newer position from rollback segments. Fixed by always preferring a position from rollback segments over a legacy position. Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>