linux-kernel - Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

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Message-ID: <alpine.DEB.2.21.1801111022520.21701@macbook-air>
Date:   Thu, 11 Jan 2018 10:26:14 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Vince Weaver <vincent.weaver@...ne.edu>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

On Thu, 11 Jan 2018, Peter Zijlstra wrote:

> I'm seeing things like:
> 
> Cannot open /sys/kernel/tracing/kprobe_events
> 
> this is likely caused by me not having anything mounted there. Rostedt
> provided the magic incantation to make that work, I'll go try now.

The perf_fuzzer krpobe code is possibly really out of date, I haven't 
really kept up with recent developments and I don't usually fuzz as root.

> At least I seem to have cured all lockdep splats.. of course, the moment
> I hit send on this someone bad is bound to happen.

Should I be trying any of those patches?

Currently I can still lock my machines pretty quickly.  I have been doing 
some more tests.  Machines don't crash if paranoid is "2" but will if 
paranoid is "1".

Vince