Re: SMP "Aiee" in 2.0.24

Minjui Huang (
Sun, 3 Nov 1996 21:30:15 -0500 (EST)


Does memtest86 support Pentium Pro ?
I grabbed memtest86-1.1.tar.gz and installed it to floppy.
However, when I rebooted the machine,
the screen shows : Loading......

MEMTEST-86 v1.1 MemSz-BIOS:64M (<---Should be 128M in my machine)
Testing: 3k-640k Pattern: ( Nothing here )
740k-736k Refresh: Default

Then it hung.

This floppy can work in another machine without problem.
(486 DX2-66 with 16M RAM)

Leonard N. Zubkoff said this might be a P6 CPU Local APIC bug.


On Thu, 31 Oct 1996, Leonard N. Zubkoff wrote:

> Most likely you are seeing a bug in the P6 CPU Local APIC that cuases
> spurious
> interrupts to incorrectly be delivered as exception 15. I first discovered
> this problem back in July without understanding why it was happening.
> Later,
> someone reported that Intel had described it in the July P6 CPU Errata.
> Linus
> installed a patch in 2.0.11 to merely print a message when this happens.
> Unfortunately, one person reported a problem with the patch, so Linus
> removed
> it in 2.0.22 despite my recommendation not to (see below for original
> discussion). Restore the patch from 2.0.11 and you will see occasional
> messages if the trap happens, but there shouldn't be any ill effects.
> Or perhaps I should prepare a more precise patch now that we understand the
> problem better.
> Leonard

On Thu, 31 Oct 1996, Alan Cox wrote:

> Date: Thu, 31 Oct 1996 23:41:39 +0000 (GMT)
> From: Alan Cox <>
> To: Minjui Huang <>
> Cc:
> Subject: Re: SMP "Aiee" in 2.0.24
> > The machine will stop at some unmounting process and I need to reboot it.
> > Without SMP enabled in 2.0.23, I still saw "Aiee" sometimes,
> > but the performance of the machine was not degraded.
> Firstly run memtest86 over the machine for 2 or 3 hours.
> Alan