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Oom导致进程消失 - 版本历史
2026-04-17T02:05:52Z
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Evan：/* see also */
2022-12-05T02:49:20Z
<p><span class="autocomment">see also</span></p>
<p><b>新页面</b></p><div>=问题=<br />
<pre><br />
java哥反映有个进程老是不见了 <br />
<br />
[root@prodo-java03 log]# <br />
<br />
cat messages | grep oom<br />
Sep 20 05:32:10 prod-hello-java03 kernel: java invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0<br />
Sep 20 05:32:10 prod-hello-java03 kernel: [<ffffffffbd1ba4e4>] oom_kill_process+0x254/0x3d0<br />
Sep 20 05:32:10 prod-hello-java03 kernel: [<ffffffffbd1b9f8d>] ? oom_unkillable_task+0xcd/0x120<br />
Sep 20 05:32:10 prod-hello-java03 kernel: [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name<br />
Sep 24 00:01:22 prod-hello-java03 kernel: tuned invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0<br />
Sep 24 00:01:22 prod-hello-java03 kernel: [<ffffffffbd1ba4e4>] oom_kill_process+0x254/0x3d0<br />
Sep 24 00:01:22 prod-hello-java03 kernel: [<ffffffffbd1b9f8d>] ? oom_unkillable_task+0xcd/0x120<br />
Sep 24 00:01:22 prod-hello-java03 kernel: [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name<br />
Sep 24 00:01:22 prod-hello-java03 kernel: java invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0<br />
Sep 24 00:01:22 prod-hello-java03 kernel: [<ffffffffbd1ba4e4>] oom_kill_process+0x254/0x3d0<br />
Sep 24 00:01:22 prod-hello-java03 kernel: [<ffffffffbd1b9f8d>] ? oom_unkillable_task+0xcd/0x120<br />
Sep 24 00:01:22 prod-hello-java03 kernel: [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name<br />
<br />
<br />
<br />
可见是 java<br />
<br />
Sep 24 00:01:22 prod-hello-java03 kernel: Out of memory: Kill process 46473 (java) score 250 or sacrifice child<br />
Sep 24 00:01:22 prod-hello-java03 kernel: Killed process 46473 (java) total-vm:5333504kB, anon-rss:2000260kB, file-rss:0kB, shmem-rss:0kB<br />
Sep 24 00:01:22 prod-hello-java03 kernel: java invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0<br />
Sep 24 00:01:22 prod-hello-java03 kernel: java cpuset=/ mems_allowed=0<br />
Sep 24 00:01:22 prod-hello-java03 kernel: CPU: 1 PID: 54533 Comm: java Kdump: loaded Not tainted 3.10.0-957.1.3.el7.x86_64 #1<br />
Sep 24 00:01:22 prod-hello-java03 kernel: Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006<br />
Sep 24 00:01:22 prod-hello-java03 kernel: Call Trace:<br />
<br />
##2021 redis oom<br />
<br />
Nov 16 02:27:34 prod--db kernel: redis-server invoked oom-killer: gfp_mask=0x10200da, order=0, oom_score_adj=0<br />
Nov 16 02:27:34 prod--db kernel: [<ffffffffc02e271a>] ? virtballoon_oom_notify+0x2a/0x70 [virtio_balloon]<br />
Nov 16 02:27:34 prod--db kernel: [<ffffffff8c7ba524>] oom_kill_process+0x254/0x3d0<br />
Nov 16 02:27:34 prod--db kernel: [<ffffffff8c7b9fcd>] ? oom_unkillable_task+0xcd/0x120<br />
Nov 16 02:27:34 prod--db kernel: [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name<br />
Nov 24 02:31:<br />
<br />
<br />
四、总结<br />
这次的故障属于典型的内存不足，导致发生OOM错误的情况。从系统状态和日常的监控以及系统日志的报错等都可发现踪迹，但缺没有引起足够的重视，最终导致死机。<br />
另外，mrtg运行出错，而发送大量垃圾邮件，引起amavisd调用clamscan被卡的问题也使系统不堪负载。<br />
类似的问题，需要针对系统进行监控以分析原因才能采取有效的措施。同时，管理员也不能忽视日常的维护工作，以免出现无可挽救的故障。<br />
<br />
※关闭OOM killer机制<br />
在特定情况下，可能我们不希望核心执行OOM killer的工作。例如，排错。<br />
则可以修改/etc/sysctl.conf，增加：<br />
引用<br />
vm.oom-kill = 0<br />
<br />
重启或执行sysctl -p即可生效。<br />
若只是临时修改，可执行：<br />
echo 0 > /proc/sys/vm/oom-kill<br />
<br />
</pre><br />
<br />
=Linux进程被杀掉oom=<br />
<pre><br />
grep "Out of memory" /var/log/messages<br />
Nov 14 11:35:56 VM-0-9 kernel: Out of memory: Kill process 27506 (mongod) score 303 or sacrifice child<br />
<br />
<br />
<br />
egrep -i -r 'killed process' /var/log<br />
匹配到二进制文件 /var/log/journal/d858b31d95a446e491fe879388912c40/system.journal<br />
/var/log/messages:Nov 14 11:35:56 VM-0-9- kernel: Killed process 27506 (mongod), UID 995, total-vm:2779764kB, anon-rss:1173456kB, file-rss:0kB, shmem-rss:0kB<br />
<br />
</pre><br />
<br />
<br />
=see also=<br />
<br />
[http://www.linuxfly.org/post/166/ oom死机处理]<br />
<br />
[https://blog.csdn.net/ggh5201314/article/details/105053545 oom killer日志分析]<br />
<br />
<br />
[https://www.cnblogs.com/duanxz/p/10185946.html Linux进程被杀掉（OOM killer），查看系统日志 ]<br />
<br />
<br />
[https://cloud.tencent.com/developer/article/1403389 linux out of memory分析(OOM)]<br />
<br />
[[category:shell]] [[category:devops]]<br />
<br />
[[category:ops]]</div>
Evan