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 <tglx@xxxxxxxxxxxxx > <mailto:tglx@xxxxxxxxxxxxx>> 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 <vikas.shivappa@xxxxxxxxxxxxxxx >>>> <mailto:vikas.shivappa@xxxxxxxxxxxxxxx>> >>>> 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: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1733662/comments/51 Are there any specific logs you would like to see, or specific actions executed? Thanks, Joe