Re: drm-next i915 regression? ( was: Re: PCI resources above 4GB)

[Steven Newbury <steve@snewbury.org.uk>]

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On 13/04/12 16:23, Steven Newbury wrote:
> On 13/04/12 15:19, Steven Newbury wrote:
>> On 13/04/12 15:13, Daniel Vetter wrote:
>>> On Fri, Apr 13, 2012 at 03:08:36PM +0100, Steven Newbury
>>> wrote:
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>>>> On 13/04/12 14:52, Steven Newbury wrote:
>>>>> On Fri, 13 Apr 2012, 14:26:19 BST, Steven Newbury 
>>>>> <steve@snewbury.org.uk> wrote:
>>>>> 
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>>>>>> On 13/04/12 13:49, Steven Newbury wrote:
>>>>>>> On 13/04/12 12:58, Steven Newbury wrote:
>>>>>>> 
>>>>>>>>> It's not stable, crashes soon after GMA comes up. 
>>>>>>>>> (Could be unrelated breakage in linus/master? 
>>>>>>>>> Probably not but I will verify.)   I noticed the 
>>>>>>>>> high allocations are occuring from the top of
>>>>>>>>> 64-bit address-space, whilst /proc/cpuinfo shows
>>>>>>>>> only 48 bits of virtual addressing.   Could that be
>>>>>>>>> why..?
>>>>>>>> To reply to myself again, I should have said crashes
>>>>>>>>  shortly after Xorg initialises using the intel
>>>>>>>> driver, in both cases! I'm building a kernel now
>>>>>>>> without the patch set to see if it's unrelated.   If
>>>>>>>> it still dies I'll try applying your patch set to a
>>>>>>>> branch without the changes from linus/master...
>>>>>>>> (should have done that anyway...)
>>>>>>> 
>>>>>>> Okay, I instead created a branch from an older 3.4-rc1+
>>>>>>>  kernel tree, running it now, and it seems to be
>>>>>>> stable. Something perhaps in the newer tree not playing
>>>>>>> nicely. I'll see if I can bisect it, or at least base
>>>>>>> of rc2 if that works... (I'm a little wary of crashing
>>>>>>> the system too much and losing my btrfs filesystem...)
>>>>>> rc2 is fine as well.   Not sure what happened there, I 
>>>>>> need to be more careful about keeping a clean tree to
>>>>>> work from.
>>>>> I'm pretty sure the crash was a from a drm-next regression.
>>>>>  I'll try bisecting it....
>>>> Sorry, posted too soon!  Almost as I clicked on send it froze
>>>>  again (using rc2 + for-pci-res-alloc ).  I had problems with
>>>>  the earlier patches re. X/i915 stability.  Strange.  I'll
>>>> see if I can track it down.
> 
>>> Please upgrade to the latest version of Linus' upstream git. A
>>>  few fixes for regressions in drm/i915 just landed there for
>>> -rc3. -Daniel
> 
>> Okay.  I'll try clean latest linus + for-pci-res-alloc.  Will 
>> report back.
> 
> Looks like either a btrfs regression or bad interaction with 
> for-pci-res-alloc.  Oops attached.
Just hit the same oops on the rc1+for-pci-res-alloc kernel I tried
earlier so it's not definitely something new in the btrfs code.  Seems
like it's a 64/32bit pointer issue??
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