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《爱数一体机内存被吃掉15GB!这个Linux隐藏"杀手"竟是它——一次生产环境性能crash实录》

  • 2026-02-05 00:44:45
《爱数一体机内存被吃掉15GB!这个Linux隐藏"杀手"竟是它——一次生产环境性能crash实录》

🚨 事发:凌晨8点的告警

早上刚到公司,手机就开始疯狂震动。登录服务器一看, top 命令的输出让人血压飙升:

top - 08:09:32 up 1355 days, 19:35,  0 users,  load average: 9.54, 6.21, 4.31

1355天(3年8个月)未重启的 CentOS 7 服务器,负载飙到 9.54,内存使用率 83%,而罪魁祸首是一个看似人畜无害的系统进程——polkitd

更离谱的是内存占用排名:

PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                          16061 polkitd   20   0   16.5g  15.5g   2184 S   2.3 25.0  12906:21 /usr/lib/polkit-1/polkitd --no-debug

一个系统守护进程,竟然吞掉了 15.5GB 物理内存(占总内存 25%)!这已经不是简单的"占内存"了,这是典型的内存泄漏(Memory Leak)


🔍 诊断:三重致命打击

通过 rpm -qa 检查,确认了更可怕的事实:

polkit-0.112-26.el7_9.1.x86_64

polkit 0.112,CentOS 7 默认版本,存在已知且无法通过配置修复的内存泄漏漏洞

当前系统面临的三重危机:

指标
数值
危险等级
影响
polkitd 内存
15.5GB
🔴 致命
OOM 风险极高
IO 等待
24.3% wa
🟠 高危
磁盘瓶颈,业务卡顿
可用内存
1.3GB (2%)
🔴 致命
随时触发 OOM Killer

更糟的是,这台服务器还跑着 AnyBackup 备份服务(esfdaemon),本身就需要 14GB 内存。两个"内存大户"叠加,系统已处于崩溃边缘


⚡ 急救:不重启系统的"微创手术"

好消息:polkitd 可以在线重启,无需重启服务器,不影响现有 SSH 连接和业务进程。

坏消息:如果操作不当,可能导致短暂的认证中断。

立即止损(3步走)

Step 1: 确认安全窗口

# 检查是否有特权操作在进行whow# 查看 polkit 版本确认漏洞存在rpm -qa | grep polkit  # 输出 0.112 即为漏洞版本

Step 2: 优雅重启

# 记录重启前状态systemctl status polkit > /tmp/polkit_status_before.log# 执行重启(会立即释放15GB内存)systemctl restart polkit# 验证新进程状态ps aux | grep polkitd

Step 3: 效果确认

# 内存应降至 30MB 以下(正常范围)systemctl status polkit# 重点关注:Memory 字段

重启后,polkitd 内存从 15.5GB 降至约 20-40MB,系统可用内存瞬间从 1.3GB 回升至 16GB+,负载开始下降。


🛠️ 根治:防止悲剧重演

单次重启治标不治本,0.112 版本会继续泄漏。两个长期方案

方案 A:升级到 0.113+(完美解决)

# 检查官方源是否有更新yum update polkit --changelog# 如有更新直接升级yum update polkit -y

方案 B:定期重启(稳妥兜底)

创建监控脚本,防止泄漏累积:

cat > /opt/scripts/polkit_guard.sh << 'EOF'#!/bin/bash# Polkit 内存守护脚本# 当内存超过 200MB 时自动重启MEMORY=$(systemctl show polkit --property=MemoryCurrent | cut -d= -f2)if [ "$MEMORY" -gt 209715200 ]; then    logger "ALERT: Polkit memory ${MEMORY} bytes, restarting..."    systemctl restart polkitecho"$(date): Polkit restarted due to high memory" >> /var/log/polkit_monitor.logfiEOFchmod +x /opt/scripts/polkit_guard.sh# 加入定时任务(每天凌晨3点检查)echo"0 3 * * * /opt/scripts/polkit_guard.sh" | crontab -

📋 复盘:运维人的 checklist

这次故障暴露了几个经典运维陷阱

  1. 忽视系统进程:总以为只有业务应用才会内存泄漏,忽略了基础组件漏洞
  2. 追求"永不重启":1355天的 uptime 不值得炫耀,可能是颗定时炸弹
  3. 监控盲区:只监控了业务进程,没监控 polkitdsystemd-journald 等系统进程内存

建议加入监控体系的关键指标

# 系统进程内存监控脚本片段checks="polkitd systemd-journald rsyslogd"for proc in$checksdo    pid=$(pgrep -x $proc)if [ -n "$pid" ]; then        mem=$(ps -o rss= -p $pid | awk '{print $1/1024}')if (( $(echo"$mem > 100" | bc -l) )); thenecho"WARNING: $proc using ${mem}MB memory"fifidone

💡 结语

在 Linux 运维中,"稳定运行"不等于"健康运行"。那个 quietly 吃掉你 15GB 内存的 polkitd,可能就是下次凌晨告警的元凶。

记住:及时的维护重启,比追求虚无的 uptime 记录更重要。

如果你也在用 CentOS 7/RHEL 7,赶紧检查一下你的 polkit 版本:

systemctl status polkit --no-pager | grep Memory

别让 15GB 内存泄漏,在你的服务器里默默生长。


延伸阅读

  • Red Hat Bugzilla: polkit memory leak in version 0.112
  • Linux OOM Killer 机制深度解析
  • 企业级服务器稳定性维护最佳实践

本文基于真实生产环境故障整理,代码经过实测,请放心食用。


作者:运维老司机公众号:敢拼才有可能赢原创文章,转载请联系作者

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  1. CONNECT:[ UseTime:0.000669s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000801s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001418s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000345s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000529s ]
  6. SELECT * FROM `set` [ RunTime:0.000256s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000570s ]
  8. SELECT * FROM `article` WHERE `id` = 471593 LIMIT 1 [ RunTime:0.000587s ]
  9. UPDATE `article` SET `lasttime` = 1770489572 WHERE `id` = 471593 [ RunTime:0.004592s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 471593 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `article` WHERE `id` > 471593 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000354s ]
  13. SELECT * FROM `article` WHERE `id` < 471593 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003033s ]
  14. SELECT * FROM `article` WHERE `id` < 471593 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001253s ]
  15. SELECT * FROM `article` WHERE `id` < 471593 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003288s ]
0.162094s