linux-kernel - Re: core i7: hang at Booting processor 5 APIC 0x3 ip 0x6000

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Date:	Sat, 27 Feb 2010 14:20:34 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Tomasz Chmielewski <mangoo@...g.org>
Cc:	"Justin P. Mattock" <justinmattock@...il.com>,
	Alberto Panizzo <maramaopercheseimorto@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: core i7: hang at Booting processor 5 APIC 0x3 ip 0x6000

Tomasz Chmielewski <mangoo@...g.org> writes:

> Justin P. Mattock wrote:
>
>> but what about 2.6.33*(hot off of the press thing).
>
> I found a way to 100% reproduce the kernel "hang" while booting
> 2.6.33. The symptoms will look like here:
>
> http://wpkg.org/files/i7_hang/
>
>
> To hang the kernel while booting, just tap repeatedly on the keyboard
> as soon as the bootloader starts loading the kernel.
>
> The kernel hangs for me every time as I do it.
>
> If it matters, I use a USB keyboard (as a matter of fact, two USB
> keyboards are connected as its a multiseat PC, although I tap the keys
> on only one of them).

Points to USB legacy BIOS code problems. FWIW i've seen the same problem
occasionally too, but I can't reproduce it reliably.

You could add some printks to the USB handoff code (and see if that appears
around the hang (drivers/usb/host/pci-quirks.c:quirk_usb_disable_ehci)

-Andi
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