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Re: Kernel panic with 64G High Memory Support enabled



On Thu, 2009-10-01 at 15:41 -0600, dann frazier wrote:
> On Thu, Oct 01, 2009 at 11:31:25PM +0200, Patrick Maier wrote:
> > Hi,
> >>> I've [...] tried to build a new kernel (2.6.30) [...] with High 
> >>> Memory Support 64G.
> >>> But after a reboot there is a kernel panic
> >>> With "High Memory Support" set to 4G the kernel works fine.
> >> Tough to say, but since it is an upstream problem I'd suggest trying
> >> the latest upstream kernel
> >
> > I've booted the kernel without the quiet option and here is a bit more  
> > detail.
> > I've attached an image with the last screen and the Kernel panic.
> >
> > Hope this brings a bit more light in the problem.
> 
> You are building a self-compiled upstream kernel right? If the problem
> is reproducible with upstream kernels, you really need to report it
> there, and ideally with results/screen shots from 2.6.32-rc1 or
> 2.6.31.

I think 2.6.30 is recent enough to report upstream; they can ask to test
a more recent version if necessary.

It sounds like there's a problem with DMA from the ATA controller to
memory above the 4 GB mark.  The kernel is quite capable of avoiding
that if the driver properly specifies the limitations of the hardware,
so this is probably a driver bug.  So it's important to know which ATA
interface you have.  If you don't know the answer to that, just include
the output of "lspci -vv" in your report.

Ben.

-- 
Ben Hutchings
Who are all these weirdos? - David Bowie, about L-Space IRC channel #afp

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