Binlog ack start may greater than binlog ack end, causing SyncWin corruption in the scenario of a timeout-reconnection between slave and master

[cheniujh]

Is this a regression?

No

Description

Binlog ack start may greater than binlog ack end, causing SyncWin corruption in the scenario of a timeout-reconnection between slave and master. This Issue only occur in multi-DB scenario.

在主从超时场景下， 可能出现同步窗口崩溃的情况，具体特征是BinlogAckEnd小于BinlogAckStart。另外，这一case只出现在多DB情况下，单DB情况下未复现。

Please provide a link to a minimal reproduction of the bug

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Screenshots or videos

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Please provide the version you discovered this bug in (check about page for version information)

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Anything else?

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