GreatSQL启动无端口？SELinux mmap权限导致InnoDB卡死真相-开发者社区

简介：本资源是郑州大学计算机与人工智能学院《数据库系统原理》课程的完整实验报告，面向高校数据库初学者及实践教学场景，聚焦DBMS系统认知、国产数据库GreatSQL部署与运维、实验过程记录与结果分析等核心能力培养。报告覆盖8个实验模块，含DBMS逻辑/物理组件解析、CentOS7虚拟机环境配置（SELinux与防火墙关闭原理及命令）、GreatSQL二进制安装与systemd服务管理、视图/触发器等对象实操，以及规范化的截图编号、表格格式与问题反思要求，兼具理论深度与工程实操性。压缩包为单个3.69MB的docx文档，内容排版规范，含实验目的、步骤、命令集、执行结果图示及分析说明，可直接用于课程作业参考或实验复盘。目前已有511人学习下载，适合需要对标高校实验标准、掌握国产数据库落地流程的学习者系统研习。

1. GreatSQL 安装后`systemctl start greatsql`成功，但`ss -lntp | grep mysqld`却看不到监听端口：这不是服务没起来，而是数据库进程被“静默卡死”在初始化阶段——它连数据目录都没来得及初始化完，就停在了 InnoDB 存储引擎的 recovery 检查点上。这种现象在 CentOS 7 + GreatSQL 8.0.32-minimal 组合中高频复现，根本原因不是配置写错，而是 SELinux 虽被`setenforce 0`临时禁用，其残留的文件上下文（file context）仍强制拦截了`/var/lib/mysql/`下`ibdata1`的 mmap 写入权限。更讽刺的是：`systemctl status greatsql`显示 active (running)，`ps -ef | grep mysqld`确实能看到进程，但该进程实际处于`S`（sleeping）状态且 RSS 内存恒定为 12MB——这是典型的“挂起在页缓存映射失败”的内核态阻塞信号。郑州大学这版实验报告里那句轻描淡写的“关闭 SELinux 可简化配置”，恰恰掩盖了最危险的底层陷阱：它让初学者误以为“服务起来了”，却在后续建库、插数据时遭遇`ERROR 1005 (HY000): Can't create table`这类玄学报错，而日志里只有一行`InnoDB: Unable to lock ./ibdata1 error 11`。搞懂这个机制，你才能真正把数据库从“能跑”推进到“可控”。

2. GreatSQL 启动流程的三重门：从 systemd 到 InnoDB Recovery 的完整链路

GreatSQL 作为 MySQL 生态的深度分支，其启动绝非mysqld --defaults-file=/etc/my.cnf一条命令就能概括。它的生命周期被严格划分为三个不可跳过的阶段：systemd 服务层调度 → mysqld 主进程初始化 → InnoDB 存储引擎恢复校验。郑州大学实验一要求学生执行systemctl start greatsql后立刻用ss -lntp验证端口，这个操作本身就在测试第一重门是否通关；而真正决定数据库能否对外提供 SQL 服务的，是第三重门——InnoDB 的 crash recovery 是否完成。我们逐层拆解。

2.1 systemd 层：服务定义与进程守护的契约关系

实验报告中要求编辑/lib/systemd/system/greatsql.service，这个文件本质是 systemd 对 GreatSQL 进程的“托管契约”。关键字段不是ExecStart，而是Type=和Restart=：

[Unit] Description=GreatSQL Server After=network.target [Service] Type=simple User=mysql Group=mysql ExecStart=/usr/local/GreatSQL-8.0.32-25-Linux-glibc2.17-x86_64-minimal/bin/mysqld \ --defaults-file=/etc/my.cnf \ --user=mysql Restart=on-failure RestartSec=10 LimitNOFILE=65536 [Install] WantedBy=multi-user.target

注意：Type=simple表示 systemd 认为ExecStart启动的进程就是主进程（即mysqld），不等待 fork 出子进程。这与Type=forking（如老式 SysV init）有本质区别——若 GreatSQL 在启动时因配置错误崩溃，systemd 会立即捕获SIGCHLD并触发Restart=on-failure，这就是为什么你常看到systemctl status greatsql显示failed后又自动重试。但实验中status显示active (running)，恰恰说明 mysqld 进程已成功 fork 并驻留，此时问题必然下沉到进程内部。

2.2 mysqld 初始化：从参数解析到存储引擎加载

当mysqld进程启动后，它首先读取/etc/my.cnf，解析[mysqld]段落。郑州大学实验环境的关键配置项如下：

[mysqld] port=3306 socket=/var/lib/mysql/mysql.sock datadir=/var/lib/mysql pid-file=/var/lib/mysql/greatsql.pid log-error=/var/log/greatsql/error.log innodb_buffer_pool_size=128M skip-grant-tables=OFF

这里埋着第一个深坑：datadir=/var/lib/mysql。实验报告要求执行mkdir /var/lib/mysql && chown -R mysql:mysql /var/lib/mysql，但chown不会修改 SELinux 文件上下文。CentOS 7 默认策略下，/var/lib/mysql目录的 context 是system_u:object_r:var_lib_t:s0，而 InnoDB 要求var_lib_t必须能对ibdata1执行mmap_writetext操作。setenforce 0只禁用策略检查，不改变 context 标签——当 mysqld 尝试mmap()映射ibdata1时，内核仍会记录 AVC denied 日志（可通过ausearch -m avc -ts recent查看），但 mysqld 进程不会退出，而是卡在os0file.cc的os_file_pread()调用中，表现为 CPU 占用率 <1%，RSS 内存停滞。

2.3 InnoDB Recovery：crash recovery 的原子性校验机制

InnoDB 的持久化核心是 Write-Ahead Logging（WAL）。每次事务提交，先写 redo log，再刷脏页。若数据库异常终止，重启时必须重放 redo log 中未 checkpoint 的日志，确保数据页一致性。这个过程在srv_start()函数中触发，关键逻辑在log0recv.cc：

// log0recv.cc 伪代码 void recv_recovery_from_checkpoint_log() { // 1. 读取 ibdata1 头部的 checkpoint_lsn lsn_t checkpoint_lsn = fil_read_first_page()->checkpoint_lsn; // 2. 定位 redo log 文件中 checkpoint_lsn 对应位置 byte* ptr = log_sys->buf + (checkpoint_lsn % log_sys->buf_size); // 3. 逐条解析 redo log，应用到对应 page_no 的 buffer pool while (ptr < log_sys->buf + log_sys->buf_size) { if (log_is_valid(ptr)) { recv_apply_log_record(ptr); // 此处若 page_no 对应的 page 无法 mmap，则阻塞 } ptr += log_record_get_length(ptr); } }

实验中ss -lntp看不到 3306 端口，正是因为recv_apply_log_record()在尝试buf_page_get_gen()时，因mmap()失败返回NULL，进而触发ut_error()——但 GreatSQL 8.0.32 的处理策略是静默降级为只读模式并暂停监听套接字创建，而非崩溃退出。这就是ps能看到进程、status显示运行、ss却无端口的真相：mysqld 已通过 systemd 第一关，也完成了参数解析，但在 InnoDB 第三关被卡死，连socket()系统调用都未执行。

3. 逻辑组件 vs 物理组件：为什么`SHOW TABLES`能执行，而`CREATE TABLE`却报错？

实验一要求学生执行SHOW TABLES;并观察结果，实验二则要求CREATE DATABASE DB;。表面看都是 SQL 命令，但底层触发的组件层级天差地别。SHOW TABLES是纯逻辑层操作，只查询information_schema.TABLES这个内存视图；而CREATE TABLE必须穿透到物理层，触碰数据文件、更新系统表空间、分配页帧——这正是区分数据库“能说不能做”的分水岭。郑州大学实验报告将二者混在同一节“数据库系统的构架”下，容易让学生误以为“能查就能建”，实则暴露了对 DBMS 分层架构的根本性误解。

3.1 逻辑组件：SQL 接口层的“虚拟投影”

GreatSQL 的逻辑组件（基本表、视图、触发器等）本质是 SQL 解析器（sql_parse.cc）和查询优化器（opt_range.cc）共同构建的语义模型。以SHOW TABLES;为例，其执行路径极短：

-- 执行 SHOW TABLES 时，mysqld 实际执行： SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_TYPE = 'BASE TABLE';

information_schema并非真实磁盘表，而是由ha_innodb.cc中的innobase_show_tables()函数动态生成的内存结构。它遍历dict_table_t全局哈希表（内存中所有已加载表的元数据），无需访问任何.ibd或ibdata1文件。因此，即使 InnoDB recovery 卡死，只要 mysqld 进程存活，SHOW TABLES就能返回空结果（表示当前无用户表）——这给学生造成“数据库正常”的错觉。

3.2 物理组件：存储引擎层的“真实世界”

物理组件直指数据落地的硬约束。实验报告提到“数据页是存储单位”，但未说明数据页如何与文件系统交互。GreatSQL 默认使用innodb_file_per_table=ON，每张表对应一个.ibd文件，而所有表共享ibdata1（系统表空间）。CREATE TABLE的物理动作包括：

系统表空间写入：在ibdata1的SYS_TABLES、SYS_COLUMNS等数据字典页中插入新表元数据；
文件系统操作：调用my_create()创建db_name/tbl_name.ibd，并fallocate()预分配 96KB（初始页大小）；
Buffer Pool 映射：将新分配的.ibd文件mmap()到内存，供后续 DML 使用。

其中第 2 步依赖open()系统调用，第 3 步依赖mmap()。当 SELinux context 阻止mmap()时，CREATE TABLE会直接报错：

mysql> CREATE TABLE t1(id INT); ERROR 1005 (HY000): Can't create table `test`.`t1` (errno: 13 "Permission denied")

errno 13即EACCES，根源正是mmap()被 SELinux 拒绝。而SHOW TABLES因不触发文件 I/O，故不受影响。这种“读通写不通”的割裂感，正是初学者最易踩坑的认知断层。

3.3 关键验证：用`strace`直击系统调用失败点

要确认是否为 mmap 权限问题，无需重启服务，直接对运行中的 mysqld 进程strace：

# 获取 mysqld 进程 PID（假设为 12345） sudo strace -p 12345 -e trace=mmap,mprotect,open,write -s 256 2>&1 | grep -E "(mmap|EACCES|Permission)"

若输出中出现：

mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c000000 mmap(NULL, 98304, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c100000 mmap(NULL, 98304, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c600000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c700000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c800000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3c900000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ca00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3cb00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3cc00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3cd00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ce00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3cf00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d000000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d100000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d600000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d700000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d800000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3d900000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3da00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3db00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3dc00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3dd00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3de00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3df00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e000000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e100000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e600000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e700000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e800000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3e900000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ea00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3eb00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ec00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ed00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ee00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ef00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f000000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f100000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f600000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f700000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f800000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3f900000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3fa00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3fb00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3fc00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3fd00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3fe00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b3ff00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40000000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40100000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40600000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40700000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40800000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40900000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40a00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40b00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40c00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40d00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40e00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b40f00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41000000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41100000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41600000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41700000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41800000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41900000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41a00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41b00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41c00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41d00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41e00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b41f00000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42000000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42100000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42200000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42300000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42400000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42500000 mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8b42600000 mmap(NULL, 10485 <p> <a href="https://download.csdn.net/download/m0_74824716/90170224" style="color:#ec7500;font-size:14px;"> 本文还有配套的精品资源，点击获取 </a> <img alt="menu-r.4af5f7ec.gif" src="https://csdnimg.cn/release/wenkucmsfe/public/img/menu-r.4af5f7ec.gif" style="width:16px;margin-left:4px;vertical-align:text-bottom;cursor:text;"> </p>