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Date: Sun, 14 Jan 2018 12:35:45 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Joseph Salisbury <joseph.salisbury@...onical.com> cc: vikas.shivappa@...ux.intel.com, stable@...r.kernel.org, linux-kernel@...r.kernel.org, ravi.v.shankar@...el.com, tony.luck@...el.com, fenghua.yu@...el.com, peterz@...radead.org, eranian@...gle.com, ak@...ux.intel.com, davidcc@...gle.com, mingo@...hat.com, hpa@...or.com, x86@...nel.org, 1733662@...s.launchpad.net, "Roderick W. Smith" <rod.smith@...onical.com> Subject: Re: [REGRESSION][v4.14.y][v4.15] x86/intel_rdt/cqm: Improve limbo list processing 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@...ux.intel.com> > 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
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