On Wed, Feb 04, 1998 at 05:25:09PM +0100, Manuel Bouyer wrote:
> You need to be in text mode to enter the debugger. The debugger don't
> know how to switch from graphic to text (it's wideo-board dependant, and
> thus only the X server know how to do it). Also, the X server has
> complete control of the keyboard, and ctrl-alt-esc isn't catched when under
> X.

Okay, that's what I thought... so there was no real problem entering the
debugger (until the machine locked up so badly that I couldn't switch
back to the text mode from X).

There should be an NMI button on the pc...

> Hum, from the spl man page, it seems that splsoftnet is at a lower
> priotity than splbio. So if the problem comes from a splbio without splx,
> then the network would be hung as well. Can someone confirm this ?

Hm..

> The problem can also come from a dead lock somewhere in the vfs or
> disk driver. It would be really really usefull to know on which resources the
> hung processes are wainting for. A kernel core dump would help for this.

I'll try to create a kernel core dump next time.  I'm sure it won't be too
long when I see the next hang. :-(

  -jm