Re: [Bugme-new] [Bug 11045] New: Bug in MPT Fusion 2.6.26-rc7 unbootable

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 8 Jul 2008 14:56:53 -0600 Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:

> On Tuesday 08 July 2008 11:23:33 am James Bottomley wrote:
> > On Tue, 2008-07-08 at 10:51 -0600, Bjorn Helgaas wrote:
> > > Which ACPI screw up is that?  And what's the usual recipe?
> > 
> > The usual screw up where subtle ACPI breakage from release to release
> > causes some IRQs to get misrouted.
> > 
> > Usually you start with noacpi and cycle through the pci routing options
> 
> Don't worry, I wasn't trying to talk you out of an ACPI bug report;
> I just wanted to get enough specifics so I could see whether it was
> something I could fix.
> 
> > If you actually read this bug report, you'll see there was a message
> > 
> > ACPI: Resource is not an IRQ entry
> > 
> > Just before the fusion IRQ failed to get delivered, so I think it's a
> > good indicator that there *are* ACPI problems ...
> 
> These messages also happen with 2.6.25, where the MPT Fusion driver
> worked, so Kurk opened a separate bugzilla,
>   http://bugzilla.kernel.org/show_bug.cgi?id=11049
> for them.
> 
> Yakui Zhao thinks the messages are harmless because they're
> related to interrupt link devices that we don't use in IOAPIC mode,
> and given that the driver works in 2.6.25, that seems plausible
> to me.
> 
> Regardless, the messages are alarming and annoying.  I'd like
> to understand them better, but I'll pursue that in the 11049
> bugzilla.
> 

Let us not forget the other part of this report:

BUG: unable to handle kernel NULL pointer dereference at 0000034c
IP: [<f885cc5e>] :mptspi:mptspi_dv_renegotiate_work+0xa/0x9f
Oops: 0000 [#1] SMP