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Linux 内核看门狗(wdt)开启办法及验证方法

2026-08-20 10:45:25

Linux 内核看门狗(wdt)开启办法及验证方法

为防止系统出现严重错误（Kernel Panic）后卡死在现场，项目中一般需要打开看门口来进行重启，来保证系统恢复。

1，未开启时手动触发Kernel Panic 来看现象

执行命令：echo c > /proc/sysrq-trigger

终端出现以下内容：

2，打开wdt功能

①设备树打开wdt

&wdt {	status = "okay";};

②配置重启超时时间---在defconfig 中打开

CONFIG_PANIC_TIMEOUT=1

再次执行 echo c > /proc/sysrq-trigger 后，系统等待1s后就会重启

3，内核源码逻辑

源码位置：kernel-6.12/kernel/panic.c

4, 喂狗进程/线程

我的平台下喂狗操作不是在用户空间，而是在内核线程中（ [] 是内核线程标致）

具体的源码如下：

/kernel-6.12/drivers/watchdog/watchdog_dev.c

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CONNECT:[ UseTime:0.000812s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001286s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000631s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000625s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001315s ]
SELECT * FROM `set` [ RunTime:0.019109s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001462s ]
SELECT * FROM `article` WHERE `id` = 506535 LIMIT 1 [ RunTime:0.023445s ]
UPDATE `article` SET `lasttime` = 1787294236 WHERE `id` = 506535 [ RunTime:0.017166s ]
SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.012413s ]
SELECT * FROM `article` WHERE `id` < 506535 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004265s ]
SELECT * FROM `article` WHERE `id` > 506535 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002325s ]
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SELECT * FROM `article` WHERE `id` < 506535 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.053997s ]

0.445301s

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