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

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Message-ID: <20180109151253.GK6176@hirez.programming.kicks-ass.net>
Date:   Tue, 9 Jan 2018 16:12:53 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     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 Tue, Jan 09, 2018 at 08:44:23AM -0500, Vince Weaver wrote:
> On Tue, 9 Jan 2018, Peter Zijlstra wrote:
> 
> > So remind me again, how are you running that fuzzer? I'm running
> > ./fast_repro99.sh as root.
> 
> I'm running ./fast_repro98.sh on a regular haswell machine with paranoid 
> set to "0".
> 
> I'll try your patch and see if it makes a difference.

I suspect not, it shouldn't be PTI specific.

> I can also try on a few other machines.  I started setting up a fuzzing 
> cluster for this kind of thing but the multiport serial card I got for 
> logging the serial consoles crashes fairly quickly under load and I 
> haven't had time to track that down.

So I don't think HSW has PT, which is something I cannot test on my IVB.
OTOH HSW has PEBS real_ip, but that uses _less_ magic.

In any case, I found yet another lockdep splat, trying to figure out wth
to do about that. Will then continue running with fast_repro98.