binlog was corrupted after shutdown and restart the server

[Weixiang Zhai]

HI, All

Recently we stopped the server and restart it as below:

1. execute "stop slave"

2. execute "flush tables"

3. drop cache:

sync ; sync ; sync ;
echo 3 > /proc/sys/vm/drop_caches

4. mysqladmin –uroot –h127.0.0.1 shutdown

the server was shutdown normally.

we restarted the server later, and  Last MySQL binlog information in error log is :

InnoDB: Last MySQL binlog file position 0 59707, file name /home/mysql/data3306/mysql/mysql-bin.063722

but the actual size of mysql-bin.063722 is 4096, and the io thread of slave reported an error that binlog was corrupted

Is there anyone knows why this happen?

Version: Percona Server 5.5.18