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Linux 内存泄漏排查复盘总结

  • 2026-04-19 08:44:18
Linux 内存泄漏排查复盘总结

一、故障背景(复盘标准写法)

现象:

  • 系统内存持续增长(free 可用内存下降)
  • 无明显业务增长
  • 最终触发:
    • OOM Killer
    • 应用异常退出
    • 系统卡顿

典型特征:

  • 内存“只涨不跌”
  • 重启恢复正常(关键判断点)

二、问题本质分类(非常关键)

内存问题 ≠ 一定是泄漏,要先分类:

类型
特征
是否泄漏
应用内存泄漏
RSS 持续增长
缓存占用(Page Cache)
buff/cache 增长
slab 泄漏
Slab 持续增长
⚠️(内核级)
内存碎片
free 充足但申请失败
句柄/连接泄漏
fd/socket 增长
⚠️

👉 80%误判来自:把 cache 当泄漏


三、排查流程(标准SRE流程)

Step 1:快速判断是不是“假泄漏”

free -m

重点看:

  • available
     是否健康
  • buff/cache
     是否过高

👉 如果是 cache:

echo 3 > /proc/sys/vm/drop_caches

Step 2:定位“谁在吃内存”

top# or

ps aux --sort =-%mem | head

关注:

  • RES(真实内存)
  • %MEM

👉 锁定 Top N 进程


Step 3:进程级深度分析

pmap -x <pid>

看:

  • total 是否持续增长

cat /proc/<pid>/status

重点:

  • VmRSS
  • VmData
  • VmSwap

Step 4:趋势分析(核心)

watch -n5 "cat /proc/<pid>/status | grep VmRSS"

👉 如果持续增长 = 高度怀疑泄漏


Step 5:细分内存来源

cat /proc/<pid>/smaps

分析:

  • heap(堆)
  • stack(栈)
  • anon(匿名内存)
  • file(映射文件)

Step 6:系统级分析(避免误判)

1)Slab分析

slabtop

👉 如果 slab 持续增长:

  • 可能是内核泄漏(如网络连接)

2)句柄泄漏

lsof -p <pid> | wc-l

👉 fd 持续增长 = 泄漏


3)socket 泄漏

ss -s

Step 7:高级工具(生产必备)

🔹 C/C++ 程序

  • valgrind
  • gperftools
valgrind --leak-check=full ./app

🔹 Java 程序

  • jmap
  • jstat
  • jvisualvm
jmap -dump:live,format=b,file=heap.hprof <pid>

🔹 通用(SRE神器)

  • perf
  • eBPF(bcc / bpftrace)

👉 例如:

memleak-bpfcc


四、典型真实案例(面试可讲)

案例1:Java 服务 OOM

现象:

  • RSS 持续增长
  • GC 无法回收

原因:

  • 对象未释放(缓存未过期)

解决:

  • 引入 LRU
  • 限制缓存大小

案例2:Nginx 内存异常

现象:

  • worker 内存增长

原因:

  • keepalive 连接未释放

解决:

keepalive_timeout 65;keepalive_requests 1000;


案例3:内核 Slab 泄漏

现象:

  • free 正常,但 slab 持续增长

原因:

  • conntrack 表未清理

解决:

sysctl -w net.netfilter .nf_conntrack_max=...

五、核心判断口诀(非常重要)

👉 一句话判断是否内存泄漏:

“内存是否随时间持续增长,并且无法回收”


六、复盘结论模板(可以直接用)

【根因】应用存在内存未释放问题(缓存/对象/连接)【影响】导致系统内存持续增长,最终触发OOM【过程】1. 通过top定位高内存进程2. 通过/proc分析RSS增长趋势3. 使用工具确认堆内存未释放【解决】- 优化代码释放机制- 增加资源上限控制【预防】- 引入内存监控(Prometheus)- 设置告警阈值(80%)- 定期heap分析


七、SRE级优化建议(升维)

1)监控体系

必须监控:

  • 内存使用率
  • RSS TopN
  • Page Cache
  • Slab
  • FD数量

👉 推荐:

  • Prometheus + Node Exporter

2)告警策略

指标
阈值
内存使用率
>80%
RSS增长率
持续增长
FD数量
异常上涨

3)自动化防护

  • OOM 自动重启
  • cgroup 限制内存
  • K8s limit

4)架构优化(关键)

  • 缓存必须设置 TTL
  • 连接池必须有上限
  • 避免无限队列

八、一句话总结(面试杀手锏)

👉

内存泄漏排查的核心不是工具,而是“趋势判断 + 分层定位 + 逐级排除”。

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  1. CONNECT:[ UseTime:0.001206s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001484s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000691s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000697s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001157s ]
  6. SELECT * FROM `set` [ RunTime:0.000487s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001753s ]
  8. SELECT * FROM `article` WHERE `id` = 485155 LIMIT 1 [ RunTime:0.002810s ]
  9. UPDATE `article` SET `lasttime` = 1776594698 WHERE `id` = 485155 [ RunTime:0.011277s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000670s ]
  11. SELECT * FROM `article` WHERE `id` < 485155 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001153s ]
  12. SELECT * FROM `article` WHERE `id` > 485155 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001225s ]
  13. SELECT * FROM `article` WHERE `id` < 485155 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001570s ]
  14. SELECT * FROM `article` WHERE `id` < 485155 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001972s ]
  15. SELECT * FROM `article` WHERE `id` < 485155 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002292s ]
0.196456s