FreeBSD 6.0-REL, system lockup, recovers when keyboard pressed

[Kris Kennaway]

Dale Shaw wrote:
> Hi all,
> 
> I'm sorry if this is a FAQ. I searched but couldn't find a direct
> match yada yada..
> 
> I have a vanilla 6.0-RELEASE system running a bunch of network
> management type tools like RANCID, nfcapd, cacti and so on.
> 
> After a few days of normal operation, the system (locked away in a
> data centre) falls off the network. Can't SSH to it, can't ping it. No
> ARP -- gone! I have no OOB access to this machine (it's a test
> box/play pen).
> 
> Strangely, when I drive out and visit the machine (a HP DL320) in
> person and press enter a couple of times on the keyboard, it springs
> back to life like nothing ever happened. I literally see (for example)
> log entries dated "Feb  07" immediately followed by entries dated "Feb
> 28". Some processes lose the plot and need to be restarted, but others
> just continue on their merry way.
> 
> In my searching I have found a couple of references to dodgy keyboard
> drivers, problems with systems on KVM switches (like this one is), and
> power management issues.
> 
> Any clues? Unfortunately tracking -STABLE is not really an option for
> me on this box, but I'm more than happy to update and build a new
> kernel on a once-off basis if someone says it's a known bug/problem
> sorted out in a post-6.0-RELEASE fix.

I have a vague memory of something like this but cannot point to a 
specific commit that resolved it.

Kris