Using watch to monitor serial port results in reboot

Craig Rodrigues rodrigc at
Mon Oct 11 15:09:15 PDT 2004

On Sun, Oct 10, 2004 at 03:57:13AM -0400, Brian Fundakowski Feldman wrote:
> On Sat, Oct 09, 2004 at 09:50:45PM -0400, Craig Rodrigues wrote:
> > watch -c /dev/ttyd0
> > 
> > and then:
> > 
> > killall watch
> > 
> > My system immediately reboots (not even a kernel panic).
> > 
> > I am wondering if the recent work on the tty drivers has
> > anything to do with this?
> This is my experience with watch on a serial port the last time I tried
> it (years and years ago).

Do you remember what FreeBSD version you tried this on?
I use watch under FreeBSD 4.9 without any problems, and can kill it
without resulting in the machine rebooting.

It would be nice if this could work on -CURRENT, but I don't
know how to go about debugging something where the machine
reboots (not even the kernel panics).

Any hints on how to do this?


Craig Rodrigues
rodrigc at

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