Re: [gentoo-user] Re: Gentoo segfaults on virtualbox-4.1.14 when running on AMD bulldozer

[Michael Mol <mikemol@gmail.com>]

On Mon, Apr 30, 2012 at 3:03 PM, Markos Chandras <hwoarang@gentoo.org> wrote:
> On 04/30/2012 02:33 PM, Michael Mol wrote:
>> Neat. Random guess, but it could be a bug in Bulldozer's memory
>> controller or IOMMU. Try disabling IOMMU support in your kernel?
>>
>> On Apr 29, 2012 3:29 PM, "Markos Chandras" <hwoarang@gentoo.org
>> <mailto:hwoarang@gentoo.org>> wrote:
>>
>> On 04/28/2012 01:24 AM, Matthew Marlowe wrote:
>>> On Fri, Apr 27, 2012 at 3:54 PM, Markos Chandras
>> <hwoarang@gentoo.org <mailto:hwoarang@gentoo.org>> wrote:
>>>> On 04/27/2012 11:45 PM, Nikos Chantziaras wrote:
>>>>> On 27/04/12 22:35, Markos Chandras wrote:
>>>>>> I replaced my Phenom II cpu with a new 6-core AMD
>>>>>> bulldozer.
>> However, I
>>>>>> noticed that all of my Gentoo virtual machines throw
>>>>>> (compiler) segmentation faults when building or running any
>>>>>> application.
>>>>>
>>>
>>> I'm not familiar with virtualbox, but I've seen similar issues
>>> occur with vmware and the solution was to at least temporarily
>>> mask whatever new cpu flags the new hypervisor was passing to the
>>> guest.  In vmware, one could limit the cpu flags to maintain
>>> compatibility with various cpu releases which was especially
>>> helpful in clusters.... Yes, your gentoo vms should have been
>>> fine ..but at least until you track down the issue, see if
>>> virtualbox has a similar feature?
>>>
>> Interestingly this seems to be caused when using my wireless card
>> to bridge the virtualbox interfaces onto. I can't reproduce (yet)
>> any segfaults when I use the onboard ethernet card. I have the
>> following wireless card (supported by the rtl8180 kernel module)
>>
>> 04:06.0 Ethernet controller: Belkin F5D7000 v7000 Wireless G
>> Desktop Card [Realtek RTL8185] (rev 20)
>>
>> -- Regards, Markos Chandras / Gentoo Linux Developer / Key ID:
>> B4AFF2C2
>>
> AMD IOMMU (Device Drivers -> Hardware IOMMU ) makes no difference. I
> will have to move the discussion to virtualbox forums/ML as this seems
> a driver or virtualbox problem. Bridge networking on that wireless
> card work flawlessly when using Windows 7 as host.

Report back when you find out the meat of the problem. I'm intensely curious.

-- 
:wq