B5-lite rebooting with "watchdog reset" in logs but I'm not using Watchdog


#1

Starting today, a B5Lite that has been in service for over a year is randomly rebooting. I have trouble shot it back to the client end radio of a link. Both the client and the AP are running 1.4.6. Both are being powered by a Netonix switch.

When the client radio reboots, it is down for almost exactly 1 minute and the log file shows this:

2018-02-11 16:02:26 (UTC +0000) root: MIMO_EVENT ethernet link up (1000/Full)
2018-02-11 16:02:26 (UTC +0000) root: MIMO_EVENT System time changed… phystats re-sync
2018-02-11 16:02:26 (UTC +0000) syslog: MIMO_EVENT Station, exiting TDWR exclusion
2018-02-11 16:02:26 (UTC +0000) root: MIMO_EVENT ethernet link becomes ready
2018-02-11 16:02:28 (UTC +0000) root: MIMO_EVENT ethernet link up (1000/Full)
2018-02-11 16:02:28 (UTC +0000) root: MIMO_EVENT System time changed… phystats re-sync
2018-02-11 16:02:33 (UTC +0000) root: MIMO_EVENT ethernet vendor id: 0x221622.
2018-02-11 16:02:34 (UTC +0000) root: MIMO_EVENT Shutdown reason: Watchdog Reset
2018-02-11 16:02:36 (UTC +0000) root: MIMO_EVENT Startup reason: Watchdog Reset

I do not have watchdog turned on in either the radio or the switch. I don’t know why I am seeing Watchdog Reset in the logs… The reboots are random. I’ll get 4 or 5 in a 30 minute window and then quiet for a few hours and then another. No traffic spikes, no voltage changes, everything is running on battery systems…

Any insight as to what is causing this reboot?


#2

In regard to sort of similar ‘watchdog’ reboots on a A5 I have been told that the radio has a watchdog functionality build-in that cannot be switched off. It is triggered by lack of memory or cpu issues. How and when exactly I am not aware. In my case it was probably something to do with interference from airplanes approach radar. I swapped frequency and the issue was gone together with the many clients disconnects…


#3

Chadwick,

The watchdog you are referring to is an internal system process that monitors all the other system processes.

It not the same as the Watchdog feature which allows one have the radio reboot if does not get ping response from an IP address configured by the user.

I notice that you did reach out to us, and thanks for the log data you provided. We will analyze this data and let you know our findings.