On Tue, 16 Jan 2018, Joseph Salisbury wrote: > 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? No, the KASAN output is pretty clear where the issue is. Thanks, tglx