Subject: Re: USB-related freeze? (Unsure...)
To: Mason Loring Bliss <>
From: Lennart Augustsson <>
List: current-users
Date: 05/19/1999 01:30:04
Mason Loring Bliss wrote:

> Hi, all. I'll try to reproduce this if no one else sees it, although I'm
> not really excited about trying...
> A day or three ago I'd picked up a USB mouse just to try it, and I've
> been running it happily... I didn't reboot when I threw it in, so I
> could see a hot swap in action. This went fine. Just now I decided that
> I want to go back to my older (and nicer) Logitech thing, so I pulled
> the USB mouse, again watching the logs and seeing
> May 18 19:08:57 acheron /netbsd: uhub0: port error, restarting port 2
> May 18 19:08:57 acheron /netbsd: ums0: at uhub0 port 2 (addr 2) disconnected
> which I assume is normal...?
> Anyway, X had been using this mouse, and maybe X got confused or something,
> but when I shut the system down, it froze about where X goes away. I have
> to core dump to examine, unfortunately, and I couldn't seem to get into
> the debugger. I was also unable to get away from X to a wscons terminal
> to see what was going on. Finally, the machine wasn't answering on the
> net. I assumed it was dead, and punched the reset button.

Unplugging USB devices doesn't really work as it should.  It's one of my
summer projects to try and make it work properly.
So you don't have to file a PR, it's a known problem.


        -- Lennart