Re: Catching NForce2 lockup with NMI watchdog

From: Craig Bradney <cbradney@zip.com.au>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: Josh McKinney <forming@charter.net>, linux-kernel@vger.kernel.org
Subject: Re: Catching NForce2 lockup with NMI watchdog
Date: Fri, 05 Dec 2003 18:05:01 +0100	[thread overview]
Message-ID: <1070643901.3962.10.camel@athlonxp.bradney.info> (raw)
In-Reply-To: <1070633973.4100.23.camel@athlonxp.bradney.info>

Having just had another hang.. I tried booting with nmi-watchdog=1 and
then with 2.

I am currently running from the boot with 2 selected.

In my current dmesg I have these which dont normally appear and didnt
appear in the boot with 1 set.

Any ideas?

hda: IRQ probe failed (0xfffffcfa)
hdb: IRQ probe failed (0xfffffcfa)
hdb: IRQ probe failed (0xfffffcfa)

Craig

On Fri, 2003-12-05 at 15:19, Craig Bradney wrote:
> I'm getting those in dmesg too...
> 
> ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> ...trying to set up timer (IRQ0) through the 8259A ...  failed.
> ...trying to set up timer as Virtual Wire IRQ... failed.
> ...trying to set up timer as ExtINT IRQ... works.
> 
> 
> Do you really think this could be the problem?
> 
> If so, any ideas why I am relatively lucky to not have the crashes
> people are having? 5.5 days, then 5 hours, and now Im up to 17 hours...
> with a decent amount of use combined with idle time.
> 
> Craig
> 
> 
> On Fri, 2003-12-05 at 13:14, Mikael Pettersson wrote:
> > Josh McKinney writes:
> >  > On approximately Fri, Dec 05, 2003 at 08:40:58AM +0100, Mikael Pettersson wrote:
> >  > > Jesse Allen writes:
> >  > >  > Hi,
> >  > >  > 
> >  > >  > I have a NForce2 board and can easily reproduce a lockup with grep on an IDE 
> >  > >  > hard disk at UDMA 100.  The lockup occurs when both Local APIC + IO-APIC are 
> >  > >  > enabled.  It was suggested to me to use NMI watchdog to catch it.  However, the 
> >  > >  > NMI watchdog doesn't seem to work.
> >  > >  > 
> >  > >  > When I set the kernel parameter "nmi_watchdog=1" I get this message in 
> >  > >  > /var/log/syslog:
> >  > >  > Dec  4 20:10:30 tesore kernel: ..MP-BIOS bug: 8254 timer not connected to 
> >  > >  > IO-APIC
> >  > >  > Dec  4 20:10:30 tesore kernel: timer doesn't work through the IO-APIC - 
> >  > >  > disabling NMI Watchdog!
> >  > >  > 
> >  > >  > "nmi_watchdog=2" seems to work at first, In /var/log/messages:
> >  > >  > Dec  4 20:13:11 tesore kernel: testing NMI watchdog ... OK.
> >  > >  > but it still locks up.
> >  > > 
> >  > > The NMI watchdog can only handle software lockups, since it relies on
> >  > > the CPU, and for nmi_watchdog=1 the I/O-APIC + bus, still running.
> >  > > Hardware lockups result in, well, hardware lockups :-(
> >  > 
> >  > So does this confirm that the lockups with nforce2 chipsets and apic
> >  > is actually a hardware problem after all? 
> > 
> > Confirm with very high probability. There may be quirks in nVidia's
> > chipset that we (unlike their Windoze drivers) don't know about.
> > 
> > Ask nVidia for detailed chipset documentation. Then maybe we can fix this.
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