From: Thomas Gleixner <tglx@linutronix.de>
To: Joseph Salisbury <joseph.salisbury@canonical.com>
Cc: vikas.shivappa@linux.intel.com, stable@vger.kernel.org,
linux-kernel@vger.kernel.org, ravi.v.shankar@intel.com,
tony.luck@intel.com, fenghua.yu@intel.com, peterz@infradead.org,
eranian@google.com, ak@linux.intel.com, davidcc@google.com,
mingo@redhat.com, hpa@zytor.com, x86@kernel.org,
1733662@bugs.launchpad.net,
"Roderick W. Smith" <rod.smith@canonical.com>
Subject: Re: [REGRESSION][v4.14.y][v4.15] x86/intel_rdt/cqm: Improve limbo list processing
Date: Tue, 16 Jan 2018 14:09:49 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1801161409120.1823@nanos> (raw)
In-Reply-To: <alpine.DEB.2.20.1801141235080.2371@nanos>
[-- Attachment #1: Type: text/plain, Size: 999 bytes --]
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@linux.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
next prev parent reply other threads:[~2018-01-16 13:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-12 16:22 [REGRESSION][v4.14.y][v4.15] x86/intel_rdt/cqm: Improve limbo list processing Joseph Salisbury
2018-01-14 11:35 ` Thomas Gleixner
2018-01-16 13:09 ` Thomas Gleixner [this message]
[not found] ` <159B72D0-06FE-4925-A11A-1F8A7741BF70@intel.com>
2018-01-16 16:40 ` Joseph Salisbury
2018-01-16 18:09 ` Thomas Gleixner
2018-01-16 18:34 ` Yu, Fenghua
2018-01-16 18:59 ` Thomas Gleixner
2018-01-17 11:00 ` [tip:x86/urgent] x86/intel_rdt/cqm: Prevent use after free tip-bot for Thomas Gleixner
2018-01-17 20:35 ` [REGRESSION][v4.14.y][v4.15] x86/intel_rdt/cqm: Improve limbo list processing Joseph Salisbury
2018-01-17 22:16 ` Joseph Salisbury
2018-01-17 22:55 ` Thomas Gleixner
2018-01-17 22:59 ` Joseph Salisbury
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