watchdog timeout problem

[YongHyeon PYUN]

On Thu, Nov 02, 2017 at 10:13:15AM -0400, Ernie Luzar wrote:
> Posted this 10/31/2017  got no reply.
> 
> Been getting these error messages since about release 10.0 I think.
> Have changed to new hardware box and new cable modem and still having
> the same error messages. Also occurs when I use em0 interface to connect 
> to the public internet instead of vge0.
> 
> vge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST>
>         metric 0 mtu 1500
> 	options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,
>         WOL_UCAST,WOL_MCAST,WOL_MAGIC>
> 	ether 00:0b:db:19:33:18
> 	hwaddr 10:00:60:21:00:93
> 	inet xxx.xxx.xxx.xxx netmask 0xfffff000
>         broadcast 255.255.255.255
> 	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> 	media: Ethernet autoselect (1000baseT <full-duplex,master>)
> 	status: active
> 
> 
> 
> Oct 30 23:43:38 fbsd kernel: vge0: watchdog timeout
> Oct 30 23:43:38 fbsd kernel: vge0: link state changed to DOWN
> Oct 30 23:43:42 fbsd kernel: vge0: link state changed to UP

[...]

Would you show me the output of dmesg?

> 
> 11/2/2017 posting this now as a update
> 
> I have continued to research this problem.
> The "man watchdog" says that the command,
> watchdog -d  will provide debugging info, and
> watchdog -t  will set a new timeout timer value
> 
> When I issue either of those commands I get this error message
> watchdog: patting the dog: Operation not supported
> 
> The man page also says a value of -t 0  disables the watchdog function.
> 
> Issuing "watchdog -t 0" does not get that above error message, but the 
> watchdog function is still enabled because I am still getting the
> 
>  kernel: vge0: watchdog timeout
>  kernel: vge0: link state changed to DOWN
>  kernel: vge0: link state changed to UP
> 
> messages.
> 

The watchdog timeout message is generated when vge(4) didn't see
transmit completion interrupts.  It has nothing to do with
watchdog(8) or watchdog(4).