On 01/16/2018 08:32 AM, Shankar, Ravi V wrote:
> Vikas on vacation until end of the month. Fenghua will look into this
> issue.
>
> On Jan 16, 2018, at 5:09 AM, Thomas Gleixner <<email address hidden>
> <mailto:<email address hidden>>> wrote:
>
>>
>> Vikas, Fenghua can you please look at that ASAP?
>>
>> On Sun, 14 Jan 2018, Thomas Gleixner wrote:
>>
>>> On Fri, 12 Jan 2018, Joseph Salisbury wrote:
>>>
>>>> Hi Vikas,
>>>>
>>>> A kernel bug report was opened against Ubuntu [0]. After a kernel
>>>> bisect, it was found that reverting the following commit resolved
>>>> this bug:
>>>>
>>>> commit 24247aeeabe99eab13b798ccccc2dec066dd6f07
>>>> Author: Vikas Shivappa <<email address hidden>
>>>> <mailto:<email address hidden>>>
>>>> Date: Tue Aug 15 18:00:43 2017 -0700
>>>>
>>>> x86/intel_rdt/cqm: Improve limbo list processing
>>>>
>>>>
>>>> The regression was introduced as of v4.14-r1 and still exists with
>>>> current mainline. The trace with v4.15-rc7 is in comment #44[1].
>>>>
>>>> I was hoping to get your feedback, since you are the patch author. Do
>>>> you think gathering any additional data will help diagnose this issue,
>>>> or would it be best to submit a revert request?
>>>
>>> That stinks like a use after free. Can you run with KASAN enabled?
>>>
>>> Thanks,
>>>
>>> tglx
On 01/16/2018 08:32 AM, Shankar, Ravi V wrote: b13b798ccccc2de c066dd6f07
> Vikas on vacation until end of the month. Fenghua will look into this
> issue.
>
> On Jan 16, 2018, at 5:09 AM, Thomas Gleixner <<email address hidden>
> <mailto:<email address hidden>>> wrote:
>
>>
>> Vikas, Fenghua can you please look at that ASAP?
>>
>> On Sun, 14 Jan 2018, Thomas Gleixner wrote:
>>
>>> On Fri, 12 Jan 2018, Joseph Salisbury wrote:
>>>
>>>> Hi Vikas,
>>>>
>>>> A kernel bug report was opened against Ubuntu [0]. After a kernel
>>>> bisect, it was found that reverting the following commit resolved
>>>> this bug:
>>>>
>>>> commit 24247aeeabe99ea
>>>> Author: Vikas Shivappa <<email address hidden>
>>>> <mailto:<email address hidden>>>
>>>> Date: Tue Aug 15 18:00:43 2017 -0700
>>>>
>>>> x86/intel_rdt/cqm: Improve limbo list processing
>>>>
>>>>
>>>> The regression was introduced as of v4.14-r1 and still exists with
>>>> current mainline. The trace with v4.15-rc7 is in comment #44[1].
>>>>
>>>> I was hoping to get your feedback, since you are the patch author. Do
>>>> you think gathering any additional data will help diagnose this issue,
>>>> or would it be best to submit a revert request?
>>>
>>> That stinks like a use after free. Can you run with KASAN enabled?
>>>
>>> Thanks,
>>>
>>> tglx
Here is some data wiht KASAN enabled: /bugs.launchpad .net/ubuntu/ +source/ linux-hwe/ +bug/1733662/ comments/ 51
https:/
Are there any specific logs you would like to see, or specific actions
executed?
Thanks,
Joe