linux-kernel - Re: perf: WARNING: kernel/events/core.c:4893 perf_mmap

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Date:   Tue, 23 Aug 2016 20:08:23 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Will Deacon <will.deacon@....com>
Cc:     Vince Weaver <vincent.weaver@...ne.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: WARNING: kernel/events/core.c:4893 perf_mmap_close

Will Deacon <will.deacon@....com> writes:

> Hi Alexander,
>
> On Fri, Aug 12, 2016 at 08:54:49PM +0300, Alexander Shishkin wrote:
>> Yes, I tracked to a race between unmapping and set_output, trying to
>> come up with a good fix now.
>
> Did you get anywhere with this? I think I just hit the same issue with
> the intel-pt driver on my broadwell laptop with -rc3+PREEMPT (dump
> below) and I'm more than happy to test a fix.

Yes, I posted a patchset [1] this morning that should fix this; if this
is PT, 3/3 should suffice.

What's "pt-poker", btw? :)

[1] http://marc.info/?l=linux-kernel&m=147194269031047

Regards,
--
Alex