阿里云ECS安装mysql后命令行登录mysql提示Segmentation fault解决办法

2023年8月13日 284次阅读 来源: 程空万里

mysql版本：5.7.23
在内网的服务器上安装都没问题，但在公司买的阿里云ECS安装，就遇到这样的问题，我也没搞懂！
问题描述：
安装好后，把mysql跑起来后，命令行登录mysql提示Segmentation fault

[root@izwz9i9xmvw9w1xko4wkriz ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.23 Source distribution

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Segmentation fault
[root@izwz9i9xmvw9w1xko4wkriz ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.23 Source distribution

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Segmentation fault
[root@izwz9i9xmvw9w1xko4wkriz ~]#

查看错误日志，是这样的：

[Note] Aborted connection 2 to db: 'unconnected' user: 'root' host: '' (Got an error reading communication packets)

百度，Google了好长时间，一直搜Got an error reading communication packets，人家说要么是网络问题，要么是系统时间，要么是mysql max_allowed_packet设得太小，还有就是要么是wait_timeout等等，所有这些都试了个遍，都没解决问题，忽略了控制台有个Segmentation fault出错提示。
==========解决方法1============
在源码包里,编辑文件 cmd-line-utils/libedit/terminal.c
把terminal_set方法中的 char buf[TC_BUFSIZE]; 这一行注释,再把 area = buf;改为 area = NULL;
更改后如下

/* terminal_set():
 *      Read in the terminal capabilities from the requested terminal
 */
protected int
terminal_set(EditLine *el, const char *term)
{
        int i;
        char buf[TC_BUFSIZE];
        char *area;
        const struct termcapstr *t;
        sigset_t oset, nset;
        int lins, cols;

        (void) sigemptyset(&nset);
        (void) sigaddset(&nset, SIGWINCH);
        (void) sigprocmask(SIG_BLOCK, &nset, &oset);

        //area = buf;
        area = NULL;


        if (term == NULL)
                term = getenv("TERM");

注意是area = buf;那一行。
改好后，重新编译安装。
最后，终于进入了

[root@izwz9i9xmvw9w1xko4wkriz ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.23 Source distribution

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Segmentation fault
[root@izwz9i9xmvw9w1xko4wkriz ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.23 Source distribution

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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    原文作者：程空万里
    原文地址: https://www.jianshu.com/p/60f1f37a4314
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