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

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Message-ID: <87k2fqmska.fsf@ashishki-desk.ger.corp.intel.com>
Date:	Tue, 09 Aug 2016 08:15:17 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org
Cc:	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

Vince Weaver <vincent.weaver@...ne.edu> writes:

> Hello
>
> running the perf_fuzzer on Haswell, this is a new warning I don't think 
> I've seen before.
>
> It works out to be this code here:
>
>                 /* this has to be the last one */
>                 rb_free_aux(rb);
>                 WARN_ON_ONCE(atomic_read(&rb->aux_refcount));
>
>                 mutex_unlock(&event->mmap_mutex);

Awesome, I'll have a look. Can you tell it it was messing around with
intel_bts driver from the fuzzer log?

Thanks,
--
Alex