Re: CFT: vr(4)

On Sunday 17 February 2008, Milan Obuch wrote:
> On Sunday 17 February 2008, Robert Watson wrote:
> > On Sat, 16 Feb 2008, Milan Obuch wrote:
> > >> I have tested 4-port Rhine III(6105LOM) and I never seen this hangs.
> > >> Does this also happen on other network interface too? When the system
> > >> hangs, would you break into DDB and show me the output of 'show
> > >> alllocks' and 'ps'?
> > >
> > > I need some tests with another box. I was not able to break into DDB.
> > > Ctrl-Alt-Esc worked until hang. Hang was really hard, Ctrl-Alt-Esc did
> > > not invoke DDB. I do not feel if_vr is culprit here, more probably PCI
> > > bus got somehow locked, but I have no idea how could I test it
> > > currently.
> >
> > FYI, there are known issues with the effectiveness of syscons
> > ctrl-alt-esc to get into the debugger -- if you haven't tried with a
> > serial break on a serial console, you might want to do so.  This is
> > because syscons's interrupt handler acquires the Giant lock in an
> > ithread, requiring a lot more things to be happy to succeed.  In
> > constrast, sio (and friends) use fast interrupt handlers and no Giant
> > lock on the way to processing the break request.  It may well be that a
> > serial break doesn't get into DDB for you, but it's worth trying...
> >
> > Robert N M Watson
> > Computer Laboratory
> > University of Cambridge
>
> You are right, after rebuilding kernel with BREAK_TO_DEBUGGER I am able to
> get requested data. BTW, I can't find just now what ALT_BREAK_TO_DEBUGGER
> means...
>
> After kldload if_vr, dhclient vr0 and ping -f <someaddress> in a minute
> system freezes.
>

Correction... as I moved cable from on-board re0 to vr0, system remembered arp 
table entry and did not actually try to use vr0. Now I repeated it, but boot 
system with cable in vr0. This time it hangs right after ping <>, and break 
does not enter debugger... hard hang. I tried it twice, the same result...

So no data to check, actually, only hard hang.

Regards,
Milan

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