mysqld进程几分钟重启一次，如何解决？

我的mysqld服务是用
cd /usr/local/mysql
./bin/mysqld_safe --defaults-file=/home/user/mysql/my.cnf &
来启动的，但是之前启动都没有问题，今天发现mysql进程启动后，查看/home/repay/mysql/data/<hostname>.err日志发现有以下信息几分钟会就出现一次。查看mysqld_safe没有丢失，但是mysqld进程一直隔几分钟重启一次，并且对应的mysql.sock文件也是几分钟前刚产生。就是每次重启都会再生成这个文件一次。请问能从日志中判断什么原因引起重启吗？以及如何解决。我看了另一台服务器也是同样的启动方法，它的mysqld进程就没有不停的重启。

170830 18:20:02 mysqld_safe Number of processes running now: 0
170830 18:20:02 mysqld_safe mysqld restarted
170830 18:20:02 [Note] /usr/local/mysql/bin/mysqld (mysqld 5.5.47) starting as process 1414 ...
170830 18:20:02 [Note] Plugin 'FEDERATED' is disabled.
170830 18:20:02 InnoDB: The InnoDB memory heap is disabled
170830 18:20:02 InnoDB: Mutexes and rw_locks use GCC atomic builtins
170830 18:20:02 InnoDB: Compressed tables use zlib 1.2.3
170830 18:20:02 InnoDB: Using Linux native AIO
170830 18:20:02 InnoDB: Initializing buffer pool, size = 128.0M
170830 18:20:02 InnoDB: Completed initialization of buffer pool
170830 18:20:02 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
170830 18:20:02 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
170830 18:20:02 InnoDB: Waiting for the background threads to start
170830 18:20:03 InnoDB: 5.5.47 started; log sequence number 83660787
170830 18:20:03 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
170830 18:20:03 [Note] - '0.0.0.0' resolves to '0.0.0.0';
170830 18:20:03 [Note] Server socket created on IP: '0.0.0.0'.
170830 18:20:03 [Note] Event Scheduler: Loaded 0 events
170830 18:20:03 [Note] /usr/local/mysql/bin/mysqld: ready for connections.
Version: '5.5.47' socket: '/tmp/mysql.sock3306' port: 3306 MySQL Community Server (GPL)