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Linux 6.1引入新功能,更容易辨认出故障的CPU

  • 2026-04-16 15:52:42
Linux 6.1引入新功能,更容易辨认出故障的CPU
出品 | OSC开源社区（ID：oschina2013)
对于多 CPU 同时运行的 Linux 生产环境（比如大型服务器），Linux 6.1 新增了一个非常实用的功能：在出故障的时候，错误消息将通知你到底是哪个 CPU 出了问题。
该功能来自 Linux 6.1 合并窗口的  x86/cpu分支补丁：在出现分段错误（segfault）时，故障消息会打印出 “有嫌疑” 的 CPU 编号。
补丁作者 Rik van Riel 解释了该功能的开发动机和运作原理：

在足够大的计算机群中，通常会有几个坏的 CPU。一般情况下可以通过查看运行的内核代码来识别。如果存在有问题的 CPU，那内核代码在其他地方运行良好，而在某个故障的 CPU 内核上不断崩溃。

然而这么多年来，出问题的 CPU 的故障模式是非常具体的，你可能在 bash、python 或各种系统守护程序中找到分段错误，然而故障消息不会告诉你是哪个 CPU 出了问题。现在我们将 printk () 添加到 show_signal_msg () ，就可以在分段错误时打印对应的 CPU、内核和套接字。

目前这个功能还不完美，可能出现误报的情况。因为从发生故障到输出对应的错误消息，任务可能会在另一个 CPU 上重新安排，导致报告的 CPU 编号出错。

但它已经足以帮助人们识别出大部分有故障的 CPU 内核。

下面是一个功能示例：
  segfault[1349]: segfault at 0 ip 000000000040113a sp 00007ffc6d32e360 error 4 in \    segfault[401000+1000] likely on CPU 0 (core 0, socket 0)
这个 printk 可以通过/proc/sys/debug/exception-trace来控制。据外媒 Phoronix报道，该功能将在 10 月的 Linux 6.1 稳定版中正式启用。
关于 segfault 

segfault ：分段错误 / 段错误 / 段出错，是软件开发中经常会遇到的错误，也是 Linux 内核中最常见的 bug。

该错误是由非法内存访问造成的，如空指针引用、在只读内存区域进行写操作、访问受保护的内存区域等。

相关链接：

  • https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/cpu&id=c926087eb38520b268515ae1a842db6db62554cc

  • https://www.phoronix.com/news/Linux-6.1-Seg-Fault-Report-CPU

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  1. CONNECT:[ UseTime:0.000525s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000966s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000540s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000537s ]
  8. SELECT * FROM `article` WHERE `id` = 484086 LIMIT 1 [ RunTime:0.001608s ]
  9. UPDATE `article` SET `lasttime` = 1776354752 WHERE `id` = 484086 [ RunTime:0.002217s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 484086 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000498s ]
  12. SELECT * FROM `article` WHERE `id` > 484086 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000418s ]
  13. SELECT * FROM `article` WHERE `id` < 484086 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000818s ]
  14. SELECT * FROM `article` WHERE `id` < 484086 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001037s ]
  15. SELECT * FROM `article` WHERE `id` < 484086 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000783s ]
0.078370s