MySQL 近两三个月莫名其妙停止两次了

MySQL 近两三个月莫名其妙停止两次了。
下面是日志，具体是什么原因呢，看不懂。
凌晨 3 点有备份数据库到阿里云 OSS 的计划任务，难道是备份数据库导致的，意外停止？

2022-04-10 01:45:33 27880 [Note] Plugin 'FEDERATED' is disabled.
2022-04-10 01:45:33 27880 [Note] InnoDB: Using atomics to ref count buffer pool pages
2022-04-10 01:45:33 27880 [Note] InnoDB: The InnoDB memory heap is disabled
2022-04-10 01:45:33 27880 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2022-04-10 01:45:33 27880 [Note] InnoDB: Memory barrier is not used
2022-04-10 01:45:33 27880 [Note] InnoDB: Compressed tables use zlib 1.2.11
2022-04-10 01:45:33 27880 [Note] InnoDB: Using Linux native AIO
2022-04-10 01:45:33 27880 [Note] InnoDB: Using CPU crc32 instructions
2022-04-10 01:45:33 27880 [Note] InnoDB: Initializing buffer pool, size = 16.0M
2022-04-10 01:45:33 27880 [Note] InnoDB: Completed initialization of buffer pool
2022-04-10 01:45:33 27880 [Note] InnoDB: Highest supported file format is Barracuda.
2022-04-10 01:45:33 27880 [Note] InnoDB: The log sequence numbers 18031304 and 18031304 in ibdata files do not match the log sequence number 38084462 in the ib_logfiles!
2022-04-10 01:45:33 27880 [Note] InnoDB: Database was not shutdown normally!
2022-04-10 01:45:33 27880 [Note] InnoDB: Starting crash recovery.
2022-04-10 01:45:33 27880 [Note] InnoDB: Reading tablespace information from the .ibd files...
2022-04-10 01:45:33 27880 [Note] InnoDB: Restoring possible half-written data pages 
2022-04-10 01:45:33 27880 [Note] InnoDB: from the doublewrite buffer...
InnoDB: Last MySQL binlog file position 0 292392, file name mysql-bin.000549
2022-04-10 01:45:34 27880 [Note] InnoDB: 128 rollback segment(s) are active.
2022-04-10 01:45:34 27880 [Note] InnoDB: Waiting for purge to start
2022-04-10 01:45:34 27880 [Note] InnoDB: 5.6.50 started; log sequence number 38084462
2022-04-10 01:45:34 27880 [Note] Recovering after a crash using mysql-bin
2022-04-10 01:45:34 27880 [Note] Starting crash recovery...
2022-04-10 01:45:34 27880 [Note] Crash recovery finished.
2022-04-10 01:45:35 27880 [Note] RSA private key file not found: /www/server/data//private_key.pem. Some authentication plugins will not work.
2022-04-10 01:45:35 27880 [Note] RSA public key file not found: /www/server/data//public_key.pem. Some authentication plugins will not work.
2022-04-10 01:45:35 27880 [Note] Server hostname (bind-address): '*'; port: 3306
2022-04-10 01:45:35 27880 [Note] IPv6 is available.
2022-04-10 01:45:35 27880 [Note]   - '::' resolves to '::';
2022-04-10 01:45:35 27880 [Note] Server socket created on IP: '::'.
2022-04-10 01:45:35 27880 [Warning] Insecure configuration for --pid-file: Location '/www/server/data' in the path is accessible to all OS users. Consider choosing a different directory.
2022-04-10 01:45:38 27880 [Note] Event Scheduler: Loaded 0 events
2022-04-10 01:45:38 27880 [Note] /www/server/mysql/bin/mysqld: ready for connections.
Version: '5.6.50-log'  socket: '/tmp/mysql.sock'  port: 3306  Source distribution
2022-04-10 03:00:19 32674 [Note] Plugin 'FEDERATED' is disabled.
2022-04-10 03:00:19 32674 [Note] InnoDB: Using atomics to ref count buffer pool pages
2022-04-10 03:00:19 32674 [Note] InnoDB: The InnoDB memory heap is disabled
2022-04-10 03:00:19 32674 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2022-04-10 03:00:19 32674 [Note] InnoDB: Memory barrier is not used
2022-04-10 03:00:19 32674 [Note] InnoDB: Compressed tables use zlib 1.2.11
2022-04-10 03:00:19 32674 [Note] InnoDB: Using Linux native AIO
2022-04-10 03:00:20 32674 [Note] InnoDB: Using CPU crc32 instructions
2022-04-10 03:00:20 32674 [Note] InnoDB: Initializing buffer pool, size = 16.0M
2022-04-10 03:00:20 32674 [Note] InnoDB: Completed initialization of buffer pool
2022-04-10 03:00:33 32674 [Note] InnoDB: Highest supported file format is Barracuda.
2022-04-10 03:01:06 32674 [Note] InnoDB: The log sequence numbers 18031304 and 18031304 in ibdata files do not match the log sequence number 38084472 in the ib_logfiles!
2022-04-10 03:01:15 32674 [Note] InnoDB: Database was not shutdown normally!
2022-04-10 03:01:18 32674 [Note] InnoDB: Starting crash recovery.
2022-04-10 03:01:24 32674 [Note] InnoDB: Reading tablespace information from the .ibd files...