Big problems with 7.1 locking up :-(

[Gavin Atkinson]

On Mon, 2009-01-12 at 19:00 +0000, Pete French wrote:
> > I'm not sure if you've done this already, but the normal suggestions apply: 
> > have you compiled with INVARIANTS/WITNESS/DDB/KDB/BREAK_TO_DEBUGGER, and do 
> > any results / panics / etc result?  Sometimes these debugging tools are able 
> > to convert hangs into panics, which gives us much more ability to debug them. 
> 
> OK, I have now had a machine hand again, with the correct debug options in
> the kernel. The screen looked like this when I went to restart it:
> 
> 	http://toybox.twisted.org.uk/~pete/71_lor2.png
> 
> It had not, however, dropped into any kind of debugger. Also there appear
> to me console messages after the lock order reversal - is that normal ?
> 
> The machine did stay up for a signifanct amount of time before doing this. I
> notice that it is more or less identical to the one I posted whenI
> had WITNESS_KDB in the kernel too, so maybe those results arent
> entirely suprious after all ?
> 
> Given it hasnt dropped to a debugger, is there anything else I can try ? 

Can you break into the debugger with Ctrl-Alt-Esc, or by sending a break
over the serial line?

Gavin