[OE-core] Fix for the APIC hangs in qemux86-64

[Bruce Ashfield]

On 12/13/2017 09:14 AM, Richard Purdie wrote:
> On Wed, 2017-12-13 at 09:07 -0500, Bruce Ashfield wrote:
>> On 12/13/2017 09:05 AM, Richard Purdie wrote:
>>>
>>> On Wed, 2017-12-13 at 08:38 -0500, Bruce Ashfield wrote:
>>>>
>>>> On 12/13/2017 07:34 AM, Richard Purdie wrote:
>>>>>
>>>>>
>>>>> Hi Bruce,
>>>>>
>>>>> https://bugzilla.yoctoproject.org/show_bug.cgi?id=12301
>>>>>
>>>>> We've root caused the hangs we're seeing in qemux86-64 on our
>>>>> autobuilder workers. We've identified a commit on 4.15-rc3
>>>>> which
>>>>> fixes
>>>>> the issue but backporting it to the autobuilder's host kernels
>>>>> will
>>>>> be
>>>>> a pain.
>>>>>
>>>>> As a workaround I'd like to enable x2apic on qemux86-64. Since
>>>>> that
>>>>> works via MSRs it avoids the problem.
>>>>>
>>>>> Would it be a big issue to set CONFIG_X86_X2APIC=y for qemux86-
>>>>> 64?
>>>> Nope. No big deal at all. I've used the same config i the past
>>>> when doing work with rt-KVM, so I know it well.
>>>>
>>>> I'll prep a commit, and send it along as part of a rebased set
>>>> of kernel patches.
>>> Thanks, much appreciated.
>>>
>>> Did we get to the bottom of the 4.12 selftest failures?
>>>
>> Not yet no. I was distracted for a day, but need to learn how
>> to run them myself. I was able to log in via serial in my normal
>> boot flow, so that didn't get me anywhere.
>>
>> Is the selftest HOWO in the yocto docs ? I'll google it up this
>> morning.
> 
> No HOWTO but I did give you the command. In a poky checkout run:
> 
> oe-selftest -r runqemu.RunqemuTests.test_boot_deploy

Yah, that's where it went off the rails for me, so I figure that
I'm doing something stupid:

yow-bashfiel-d4 [/home/bruc...poky/build]> oe-selftest -r 
runqemu.RunqemuTests.test_boot_deploy
Traceback (most recent call last):
   File "/home/bruce/poky/scripts/oe-selftest", line 43, in <module>
     from oeqa.utils import load_test_components
ImportError: bad magic number in 'oeqa': b'\x03\xf3\r\n'

> 
> which runs a single test that fails (setup DL_DIR/SSTATE_MIRRORS first
> to speed it up a bit).
> 
> It may tell you to clear SANITY_TESTED_DISTROS, I think it auto adds
> meta-selftest now. You may also need to set DISPLAY to something (e.g.
> a dummy vncserver).

I'll keep smashing on it.

Bruce

> 
> Not sure what is different about the serial qemu is using verses your
> own tests...
> 
>>   > We may also need to backport the defconfig change back to the older
>>   > releases so we don't get the hangs in those builds either...
>>   Not a problem either. I'll prepare several.>
> 
> Thanks!
> 
> Cheers,
> 
> Richard
>>