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

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Message-ID: <20160823170651.GS10153@twins.programming.kicks-ass.net>
Date:   Tue, 23 Aug 2016 19:06:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will.deacon@....com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.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

On Tue, Aug 23, 2016 at 04:12:42PM +0100, Will Deacon wrote:
> 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.

lkml.kernel.org/r/1471942474-1854-1-git-send-email-alexander.shishkin@...ux.intel.com