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SubjectRe: PROBLEM: APIC on a Pentium Classic SMP, kernel 2.4.21-pre5 to 2.4.23-pre3
Date
I have a Tyan 2460 Dual Athlon mobo running 2.4.21-ac, and it would reliably 
freeze (i.e., completely lock up with no error messages) under moderate PCI
load (NFS, SMB, or disk-to-disk transfer). I tried "noapic" with no
improvement. I shifted to 2.4.22-ac and the problem went away.

On Monday 08 September 2003 05:33 am, Mikael Pettersson wrote:
> On Sun, 07 Sep 2003 18:37:48 -0400, Mathieu Desnoyers wrote:
> >IRQ problems with APIC enabled on a Neptune chipset, Pentium 90 SMP.
> >
> >Description
> >
> >Since kernel 2.4.21-pre2, IRQ problems are present on my Pentium 90 SMP,
> > wi= th
> >APIC enabled. It works well with 2.4.20 with APIC enabled, or with newer
> >kernels with "noapic" kernel option.
>
> There were a lot of I/O-APIC & MP table parsing changes in 2.4.21
> for clustered apic. Chances are something there broke on your
> ancient BIOS & mobo. I can't immediately see anything obviously
> broken in 2.4.21: you'll have to identify the first pre-patch where
> things broke and then test or revert it piece by piece.
>
> >On kernel 2.4.21-pre2, there is a kernel oops before this, with a
> >"Dereferencing NULL pointer".
>
> You didn't run that through ksymoops and post it, so how is anyone
> supposed to be able to debug it?
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