Description

This Article explains the reason for  automatic device reboot with reason "0x2:watchdog"

Symptoms

Customer reported the device was rebooted automatically without any changes or intervention from the users.
On EX3400,if watchdog pat did not happen within stipulated time and it might reboot automatically with "0x2:watchdog" as reboot reason.

>The syslog reports abnormal shutdown,

Dec 31 16:02:52 router1 eventd[4347]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down

Dec 31 16:02:52 router1 eventd[4347]: SYSTEM_OPERATIONAL: System is operational

>And the below command shows the last reboot reason as "0x2:watchdog"

hostname@router1> show chassis routing-engine no-forwarding
Routing Engine status:
  Slot 0:
    Current state                  Backup
    ***
    Uptime                         2 hours, 49 minutes, 30 seconds
    Last reboot reason             0x2:watchdog                                <<<<<
    Load averages:                 1 minute   5 minute  15 minute
                                       0.57       0.35       0.24

Solution

This issue is because of known PR 1469400. Broken retry interval for watchdog  is the reason for the issue and there is no workaround ,the device to be upgraded to the fixed version.

Trigger of this issue:

This issue might be seen if the following conditions are met:
* On EX3400s (VC and Non-VC setup)
* Watchdog pat not happening within stipulated time

Resolved Versions:
15.1X53-D593
17.4R2-S9
17.4R3-S1
18.1R3-S9
18.2R2-S7
18.2R3-S3
18.2R3-S8
18.2X75-D34
18.2X75-D420
18.2X75-D53
18.2X75-D60
18.3R1-S7
18.3R2-S3
18.3R3-S1
18.4R1-S5
18.4R2-S3
18.4R3
19.1R1-S4
19.1R2-S1
19.1R3
19.2R1-S3
19.2R2
19.3R2-S1
19.3R3
19.4R1-S1
19.4R2
20.1R1
20.4R3-S3


For more details refer:  https://prsearch.juniper.net/problemreport/PR1469400
 

Modification History

2023-09-06:Initial Version