linux-kernel - Re: perf: perf_fuzzer triggers GPF in perf_prepare

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Message-ID: <alpine.DEB.2.21.1812051208580.29892@macbook-air>
Date:   Wed, 5 Dec 2018 12:11:19 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Jiri Olsa <jolsa@...hat.com>
cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: perf: perf_fuzzer triggers GPF in perf_prepare_sample

On Wed, 5 Dec 2018, Jiri Olsa wrote:

> On Wed, Dec 05, 2018 at 01:45:38PM +0100, Jiri Olsa wrote:
> > On Tue, Dec 04, 2018 at 10:54:55AM -0500, Vince Weaver wrote:
> > > Hello,
> > > 
> > > I was able to trigger another oops with the perf_fuzzer with current git.
> > > 
> > > This is 4.20-rc5 after the fix for the very similar oops I previously 
> > > reported got committed.
> > > 
> > > It seems to be pointing to the same location in the source as 
> > > before, I guess maybe triggered a different way?
> > 
> > nice.. yep, looks the same
> > 
> > > 
> > > Unfortunately this crash is not easily reproducible like the last one was.
> > 
> > will check
> 
> what model are hitting this on?

Haswell.  6/60/3.

While I can't deterministically trigger this, the fuzzer usually hits it
within an hour or two.  Is there any debug or printk messages I can
add that would help figure out what's going on?

Vince