# R36.3 WatchDog Timer Enable

**URL:** <https://forums.developer.nvidia.com/t/r36-3-watchdog-timer-enable/314779>\
**Category:** Jetson Orin NX\
**Tags:** debugger\
**Created:** [November 26, 2024, 8:18am UTC](https://forums.developer.nvidia.com/t/r36-3-watchdog-timer-enable/314779 "2024-11-26T08:18:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kepts](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@kepts](https://forums.developer.nvidia.com/u/kepts)\
**Post date:** [November 26, 2024, 8:18am UTC](https://forums.developer.nvidia.com/t/r36-3-watchdog-timer-enable/314779/1 "2024-11-26T08:18:59Z")

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Hello,  
Under R35.4.1 system, use  
`echo 1 > /dev/watchdog && while true; do date; sleep 1; done`  
can test watchdog, it will reboot after 120s, but executing this command on R36.3 system will give feedback that /dev/watchdog is a busy resource.  
When I checked the Developer Guide for R36.3, I found that [Test Plan and Validation — NVIDIA Jetson Linux Developer Guide 1 documentation](https://docs.nvidia.com/jetson/archives/r36.3/DeveloperGuide/SD/TestPlanValidation.html?highlight=watchdog#jetson) -The following command mentioned in the linux-watchdog timer enable verification link is not marked. What specific command is it?

 ![image](https://global.discourse-cdn.com/nvidia/original/4X/a/e/9/ae968b7e0f8a926a44ca8647dcb4debb9d2f0cdf.png)  
Looking forward to receiving a response.  
Thank you.

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<div class="post-metadata">

**Author:** ![ShaneCCC](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/shaneccc/32/14043_2.png) [@ShaneCCC](https://forums.developer.nvidia.com/u/ShaneCCC)\
**Post date:** [November 26, 2024, 3:37pm UTC](https://forums.developer.nvidia.com/t/r36-3-watchdog-timer-enable/314779/3 "2024-11-26T15:37:03Z")

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You can try below command to hang up the system to verify the WDT.

```auto
sudo echo c > /proc/sysrq-trigger

```

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<div class="post-metadata">

**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\
**Post date:** [December 17, 2024, 11:54am UTC](https://forums.developer.nvidia.com/t/r36-3-watchdog-timer-enable/314779/5 "2024-12-17T11:54:34Z")

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Closed on December 17, 2024, 11:54am UTC

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