linux-kernel - Patch "USB: Work around BIOS bugs by quiescing USB controllers earlier" causes MCEs

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Date:	Fri, 2 Oct 2009 09:34:00 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	David Woodhouse <dwmw2@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Patch "USB: Work around BIOS bugs by quiescing USB controllers earlier" causes MCEs

Hi,

Your patch db8be50c4307dac2b37305fc59c8dc0f978d09ea is causing my
ia64 Altix system to die with an MCE in early boot.

Good dmesg looks like this:
ACPI: PCI Root Bridge [P001] (0001:00)
pci 0001:00:01.0: reg 10 io port: [0x1000-0x10ff]
pci 0001:00:01.0: reg 14 64bit mmio: [0x700000-0x703fff]
pci 0001:00:01.0: reg 1c 64bit mmio: [0x710000-0x71ffff]
pci 0001:00:01.0: reg 30 32bit mmio pref: [0x800000-0x8fffff]
pci 0001:00:01.0: supports D1 D2
pci 0001:00:02.0: reg 10 64bit mmio: [0x720000-0x72ffff]
pci 0001:00:02.0: PME# supported from D3hot
pci 0001:00:02.0: PME# disabled
pci 0001:00:02.1: reg 10 64bit mmio: [0x730000-0x73ffff]
pci 0001:00:02.1: PME# supported from D3hot
pci 0001:00:02.1: PME# disabled
pci 0001:00:03.0: reg 10 64bit mmio pref: [0x900000-0x9fffff]
pci 0001:01:01.0: reg 10 32bit mmio: [0xa00000-0xa00fff]
pci 0001:01:01.0: supports D1 D2

Bad (which is less verbose because it came from a console output):
ACPI: PCI Root Bridge [P001] (0001:00)
pci 0001:00:02.0: PME# supported from D3hot
pci 0001:00:02.0: PME# disabled
pci 0001:00:02.1: PME# supported from D3hot
pci 0001:00:02.1: PME# disabled
Entered OS MCA handler. PSP=20000000fff21120 cpu=2 monarch=1
<6>cpu 2, MCA inconsistent r12 and r13, original stack not modified
<6>Entered OS MCA handler. PSP=20000000fff21120 cpu=1 monarch=0
<6>cpu 1, MCA inconsistent r12 and r13, original stack not modified
<6>Entered OS MCA handler. PSP=20000000fff21120 cpu=0 monarch=0
<6>cpu 0, MCA inconsistent r12 and r13, original stack not modified
<6>Entered OS MCA handler. PSP=20000000fff21120 cpu=3 monarch=0
<6>cpu 3, MCA inconsistent r12 and r13, original stack not modified
<6>All OS MCA slaves have reached rendezvous
mlogbuf_finish: printing switched to urgent mode, MCA/INIT might be dodgy or fail.
Delaying for 5 seconds...

Relevant pci devices:
0001:00:03.0 PCI bridge: IBM PCI-X to PCI-X Bridge (rev 03)
0001:01:01.0 USB Controller: NEC Corporation USB (rev 43)
0001:01:01.1 USB Controller: NEC Corporation USB (rev 43)
0001:01:01.2 USB Controller: NEC Corporation USB 2.0 (rev 04)

Let me know any more info I can provide.

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