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Date: Mon, 26 Apr 2010 19:07:35 -0600
From: Robert Hancock <hancockrwd@gmail.com>
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To: Alan Stern <stern@rowland.harvard.edu>
CC: Ondrej Zary <linux@rainbow-software.org>, "H. Peter Anvin" <hpa@zytor.com>,
       Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
       Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: [linux-pm] Invalid opcode on resume from STR on Asus P4P800-VM
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On 04/26/2010 02:34 PM, Alan Stern wrote:
> On Mon, 26 Apr 2010, Ondrej Zary wrote:
>
>> On Monday 26 April 2010 21:17:27 Alan Stern wrote:
>>> On Mon, 26 Apr 2010, Ondrej Zary wrote:
>>>> Hello,
>>>> I'm trying to debug oops on resume from suspend-to-RAM on Asus P4P800-VM
>>>> mainboard. It crashes with invalid opcode (see below). The kernel is
>>>> 2.6.32-trunk from Debian but the same problem is present with vanilla
>>>> kernels - both newer and older (but screen remains blank most of the
>>>> time, only keyboard LEDs blink indicating an oops).
>>>>
>>>> What can cause this problem?
>>>>
>>>>       8.000339  invalid opcode: 0000 [#1] SMP
>>>>       8.003529  last sysfs file: /sys/power/state
>>>>       8.004265  Modules linked in: sco bridge stp bnep l2cacp crc16
>>>> bluetooth rfkill loop i2c_i801 snd_intel8x0 snd_ac97_codec shpchp
>>>> ac97_bus parport_pc parport
>>>> rng_core pci_hotplug snd_pcsp snd_pcm snd_timer snd soundcore psmouse
>>>> snd_page_alloc serio_raw evdev processor ext3 jbd mbcache ide_gd_mod
>>>> ata_generic libata scsi_mod
>>>> ide_pci_generic i915 drm_kms_helper uhci_hcd drm i2c_algo_bit piix
>>>> i2c_core ehci_hcd intel_agp e100 video ide_core mii floppy agpgart output
>>>> usbcore nls_base button
>>>> thermal fan thermal_sys [last unloaded: scsi_wait_scan]
>>>> [  148.004265]
>>>> [  148.004265] Pid: 0, comm: swapper Not tainted (2.6.32-trunk-686 #1) To
>>>> Be Filled By O.E.M. [  148.004265] EIP: 0060:[<c1008ff3>] EFLAGS:
>>>> 00010086 CPU: 0
>>>> [  148.004265] EIP is at mwait_idle+0x4e/0x6c
>>>
>>> I had exactly the same problem (on an HP computer with an Intel
>>> chipset).  As far as anyone could figure out, it is caused by a bug in
>>> the BIOS.  It's not entirely clear that this is the complete answer,
>>> but nothing else turned up.  See
>>>
>>> 	http://bugzilla.kernel.org/show_bug.cgi?id=15385
>>>
>>> for the complete record.  The best solution I could find was to boot
>>> with "idle=halt" on the command line.  You might check to see if any
>>> BIOS updates are available.
>>
>> Thanks, it does not crash with "idle=halt" or "idle=poll". According to this:
>> http://siyobik.info/index.php?module=x86&id=215
>> the MWAIT instruction can be enabled/disabled in IA32_MISC_ENABLES MSR. Kernel
>> probably should enable it at boot and also on resume.
>> Here's some more info:
>> http://software.intel.com/en-us/forums/showthread.php?t=63654
>
> That could be the answer.  Clearly this should be handled by the
> arch-specific boot/setup code.  I don't know enough about it, but other
> people do.

It looks like idle=nomwait should be the workaround with the least 
impact at the moment..
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